QObject Class | Qt 4.8 The QObject class is the base class of all Qt objects. QObject is the heart of the Qt Object Model. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. You can connect a signal to a slot with connect() and destroy the connection with disconnect(). c++ connect - Qt:meaning of slot return value? - CODE Solved I think that the return value for a slot is only available when the function is called directly (when it is a normal C++ function) or when using invokeMethod. I think this is really meant for internal Qt functions rather than for normal use in programs using Qt. Edit: For the sample case:
c++ - Qt 5 assign slot with parameters to a QPushButton ... But you're not the only one who wants to do this, so in Qt there is a class which does almost what you want: QSignalMapper. An instance of this class can be used as a "proxy" for a signal-slot connection: you connect (multiple) buttons to a slot of this class, and connect a signal of this class to your target slot. c++ - Qt issue passing arguments to slot - Stack Overflow Secondly, inside the connect() function, you need to specify the signal and slot signatures with their parameter types. Where you have count inside the connect() function, it should be int. And thirdly, there's a bracket missing in your call to connect: SIGNAL(clicked(count)). Hope that helps. Argument type for Qt signal and slot, does const reference ...
QDBusConnection Class Reference
Qt Signal, passing parameters to slot. | Qt Forum Qt Signal, passing parameters to slot. ... there is a field which stores a pointer that points to a variable which I want to connect to, and when the value changed, I ... Signals & Slots | Qt 4.8 Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Signals and slots can take any number of arguments of any type.
Same as Qt::QueuedConnection, except that the signalling thread blocks until the slot returns. This connection must not be used if the receiver lives in the signalling thread, or else the application will deadlock.
When doing MyClass* const& as a signal/slot parameter then the 'const&' part is not stripped from the generated code as it would in case of 'MyClass const&' parameter. MOC strips a reference to constant in the following expression: void mySlot( MyClass const& ); becomes: "mySlot(MyClass)\0" Exposing Attributes of C++ Types to QML | Qt QML 5.12.3 Any data that is transferred from C++ to QML, whether as a property value, a method parameter or return value, or a signal parameter value, must be of a type that is supported by the QML engine. By default, the engine supports a number of Qt C++ types and can automatically convert them as appropriately when used from QML. Qt signal and slot equivalent in c#? - social.msdn.microsoft.com
Signals & Slots | Qt 4.8
[SOLVED]Can't connect signal to slot with QVector arguments connect(protocolb, SIGNAL(RequestUpdatePlot(QVector
How to Use QPushButton - Qt Wiki The following simple code snippet shows how to create and use QPushButton. It has been tested on Qt Symbian Simulator. An instance of QPushButton is created. Signal released() is connected to slot handleButton() which changes the text and the size of the button. To build and run the example: Create an empty folder [SOLVED]Can't connect signal to slot with QVector arguments