Qt: meaning of slot return value? According to the documentation the return value from a slot doesn't mean anything.Глядя через источник Qt, кажется, что, когда слот вызывается из QMetaObject :: InvokeMethod типа возвращаемого значения может быть определен и получено возвращаемое значение. Slot with return value called via Signal between differen... |… So the Return Value seems like just not received. Can someone tell me if this is "normal" QT behaivior? Im I doing or understanding somethingMake sure your code never tries to get the return value of a slot through a signal. Anyway, signal+ slot connections do behave differently depending on... Qt: Signals & Slots | return 0; }
How to pass parameters to a SLOT function? | Qt Forum
Qt::DirectConnection 1 The slot is invoked immediately, when the signal is emitted. So I thought I could do something like i wrote above. If I well understood so the problem is that I cannot make any assumptions on if the return statement of the slot will be Slot return value - what if it would be not lost? | Qt Forum Note that you can trigger slots and get a return value. Look into the [[Doc:QMetaObject]] docs for details. OK, that is not the same as just emitting a signal and catch the return value (or, of course, values, if the signal was connected to multiple slots), but it may C2120 when using return in a void slot in Qt C++ - Stack Overflow C2120 when using return in a void slot in Qt C++. Here it is stated, that since slots are normal C++ functions one may return value, including void, I presume. How to return a value from one slot to another | Qt Forum Okey, briefly, please understand that the doWork(QPixmap pic, QString str, int indx) function takes 3 arguments and emit valueChanged(pic, str,indx) signal also returns 3 arguments. But the problem is, the doWork() slot also contains a Qt Network request,
April 25, 2011 at 13:38 Tags Python , Qt ... After all, the signal-slot connection mechanism only specifies how to connect a signal to a slot - the signal's arguments ...
Slot with return value called via Signal between ... - Qt Forum What you are seeing is undefined behaviour. Signals are not designed to give you the slots' return values, and there is no guarantee that your example will behave the same way in future versions of Qt. Make sure your code never tries to get the return value of a slot through a signal. Signals & Slots — Qt for Python
Signals & Slots — Qt for Python
Qt is well known for its signals and slots mechanism. But how does it work? In this blog post, we will explore the internals of QObject and QMetaObject and discover how signals and slot work under the hood. In this blog article, I show portions of Qt5 code, sometimes edited for formatting and brevity. How to Bind a QML Property to a C++ Function - Qt Wiki At the moment Qt Quick does not provide an implementation for linking a QML property to the result of a C++ function. There exists a suggestion for adding support for this though. In this article we will show how to make binding of properties to C++ functions work using Q_PROPERTY with a NOTIFY signal that is emitted whenever the value of the ...
slot should be a C++ member function pointer that points to the method that you ... function; Unlike Qt, in GObject some signals are able to return values back to ...
c++ - QT return value from a signal? - Stack Overflow I'm running all my SQLite database operations in a separate thread to ensure that the GUI wont freeze up. I'm doing this by connecting up signals and slots for the methods. However now I need to How to pass parameters to a SLOT function? | Qt Forum
Public Functions; Public Slots; ... The QDialog class is the base class ... The Extension Example shows how to achieve extensible dialogs using Qt. Return Value ... PyQt/Sending Python values with signals and slots - Python ... Sending Python values with signals and slots. On the #pyqt channel on Freenode, Khertan asked about sending Python values via Qt's signals and slots mechanism.