Qyoto  4.0.7
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QtCore.QMetaMethod Class Reference

The QMetaMethod class provides meta-data about a member function. More...

Inheritance diagram for QtCore.QMetaMethod:
Collaboration diagram for QtCore.QMetaMethod:

Public Types

enum  Access { Private = 0, Protected = 1, Public = 2 }
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enum  Attributes { Cloned = 2, Compatibility = 1, Scriptable = 4 }
 
enum  MethodType { Constructor = 3, Method = 0, Signal = 1, Slot = 2 }
 

Public Member Functions

 QMetaMethod ()
 
 QMetaMethod (QMetaMethod copy)
 
virtual void CreateProxy ()
 
new bool Invoke (QObject @object)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue)
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new bool Invoke (QObject @object, QGenericArgument val0)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8)
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new bool Invoke (QObject @object, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8, QGenericArgument val9)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8)
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new bool Invoke (QObject @object, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8, QGenericArgument val9)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8, QGenericArgument val9)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8)
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new bool Invoke (QObject @object, Qt.ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0, QGenericArgument val1, QGenericArgument val2, QGenericArgument val3, QGenericArgument val4, QGenericArgument val5, QGenericArgument val6, QGenericArgument val7, QGenericArgument val8, QGenericArgument val9)
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new void Dispose ()
 

Protected Member Functions

 QMetaMethod (System.Type dummy)
 

Protected Attributes

SmokeInvocation interceptor
 

Properties

QMetaMethod.Access access [get]
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int attributes [get]
 
QMetaObject EnclosingMetaObject [get]
 
int MethodIndex [get]
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QMetaMethod.MethodType methodType [get]
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System.Collections.Generic.List
< QByteArray
ParameterNames [get]
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System.Collections.Generic.List
< QByteArray
ParameterTypes [get]
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int Revision [get]
 
string Signature [get]
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string Tag [get]
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string TypeName [get]
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virtual System.IntPtr SmokeObject [get, set]
 

Detailed Description

The QMetaMethod class provides meta-data about a member function.

A QMetaMethod has a methodType(), a signature(), a list of parameterTypes() and parameterNames(), a return typeName(), a tag(), and an access() specifier. You can use invoke() to invoke the method on an arbitrary QObject.

A method will only be registered with the meta-object system if it is a slot, a signal, or declared with the Q_INVOKABLE macro. Constructors can also be registered with Q_INVOKABLE.

See also QMetaObject, QMetaEnum, QMetaProperty, and Qt's Property System.

Member Enumeration Documentation

This enum describes the access level of a method, following the conventions used in C++.

Enumerator
Private 
Protected 
Public 
Enumerator
Cloned 
Compatibility 
Scriptable 
Enumerator
Constructor 

The function is a constructor.

Method 

The function is a plain member function.

Signal 

The function is a signal.

Slot 

The function is a slot.

Constructor & Destructor Documentation

QtCore.QMetaMethod.QMetaMethod ( System.Type  dummy)
protected
QtCore.QMetaMethod.QMetaMethod ( )

Here is the call graph for this function:

QtCore.QMetaMethod.QMetaMethod ( QMetaMethod  copy)

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Member Function Documentation

virtual void QtCore.QMetaMethod.CreateProxy ( )
virtual

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new void QtCore.QMetaMethod.Dispose ( )
new bool QtCore.QMetaMethod.Invoke ( QObject object)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8,
QGenericArgument  val9 
)

This function overloads invoke().

This overload invokes this method using the connection type Qt::AutoConnection and ignores return values.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8,
QGenericArgument  val9 
)

This function overloads invoke().

This overload always invokes this method using the connection type Qt::AutoConnection.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8,
QGenericArgument  val9 
)

This function overloads invoke().

This overload can be used if the return value of the member is of no interest.

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

new bool QtCore.QMetaMethod.Invoke ( QObject object,
Qt.ConnectionType  connectionType,
QGenericReturnArgument  returnValue,
QGenericArgument  val0,
QGenericArgument  val1,
QGenericArgument  val2,
QGenericArgument  val3,
QGenericArgument  val4,
QGenericArgument  val5,
QGenericArgument  val6,
QGenericArgument  val7,
QGenericArgument  val8,
QGenericArgument  val9 
)

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

The invocation can be either synchronous or asynchronous, depending on the connectionType:

If connectionType is Qt::DirectConnection, the member will be invoked immediately.

If connectionType is Qt::QueuedConnection, a QEvent will be posted and the member is invoked as soon as the application enters the main event loop.

If connectionType is Qt::AutoConnection, the member is invoked synchronously if object lives in the same thread as the caller; otherwise it will invoke the member asynchronously.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call.

QGenericArgument and QGenericReturnArgument are internal helper classes. Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_RETURN_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_RETURN_ARG() takes a type name and a non-const reference.

To asynchronously invoke the animateClick() slot on a QPushButton:

int methodIndex = pushButton->metaObject()->indexOfMethod("animateClick()");

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(pushButton, Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be of types that are known to Qt's meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod::invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;

QByteArray normalizedSignature = QMetaObject::normalizedSignature("compute(QString, int, double)");

int methodIndex = obj->metaObject()->indexOfMethod(normalizedSignature);

QMetaMethod method = metaObject->method(methodIndex);

method.invoke(obj,

Qt::DirectConnection,

Q_RETURN_ARG(QString, retVal),

Q_ARG(QString, "sqrt"),

Q_ARG(int, 42),

Q_ARG(double, 9.7));

QMetaObject::normalizedSignature() is used here to ensure that the format of the signature is what invoke() expects. E.g. extra whitespace is removed.

If the "compute" slot does not take exactly one QString, one int and one double in the specified order, the call will fail.

Warning: this method will not test the validity of the arguments: object must be an instance of the class of the QMetaObject of which this QMetaMethod has been constructed with. The arguments must have the same type as the ones expected by the method, else, the behaviour is undefined.

See also Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), and QMetaObject::invokeMethod().

Member Data Documentation

SmokeInvocation QtCore.QMetaMethod.interceptor
protected

Property Documentation

QMetaMethod.Access QtCore.QMetaMethod.access
get

Returns the access specification of this method (private, protected, or public).

Signals are always protected, meaning that you can only emit them from the class or from a subclass.

See also methodType().

int QtCore.QMetaMethod.attributes
get
QMetaObject QtCore.QMetaMethod.EnclosingMetaObject
get
int QtCore.QMetaMethod.MethodIndex
get

Returns this method's index.

This function was introduced in Qt 4.6.

QMetaMethod.MethodType QtCore.QMetaMethod.methodType
get

Returns the type of this method (signal, slot, or method).

See also access().

System.Collections.Generic.List<QByteArray> QtCore.QMetaMethod.ParameterNames
get

Returns a list of parameter names.

See also parameterTypes() and signature().

System.Collections.Generic.List<QByteArray> QtCore.QMetaMethod.ParameterTypes
get

Returns a list of parameter types.

See also parameterNames() and signature().

int QtCore.QMetaMethod.Revision
get
string QtCore.QMetaMethod.Signature
get

Returns the signature of this method (e.g., setValue(double)).

See also parameterTypes() and parameterNames().

virtual System.IntPtr QtCore.QMetaMethod.SmokeObject
getset
string QtCore.QMetaMethod.Tag
get

Returns the tag associated with this method.

Tags are special macros recognized by moc that make it possible to add extra information about a method.

Tag information can be added in the following way in the function declaration:

#define THISISTESTTAG // tag text

...

private slots:

THISISTESTTAG void testFunc();

and the information can be accessed by using:

MainWindow win;

win.show();

int functionIndex = win.metaObject()->indexOfSlot("testFunc()");

QMetaMethod mm = metaObject()->method(functionIndex);

qDebug() << mm.tag(); // prints THISISTESTTAG

For the moment, moc doesn't support any special tags.

string QtCore.QMetaMethod.TypeName
get

Returns the return type of this method, or an empty string if the return type is void.