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 connect(buttonOne, SIGNAL(clicked()), this, SLOT(doSomething(double *))); @ This should work. But clicked() will not pass any data to your slot, so the pointer will be dangling. Plus you probably put the connect statement in a wrong place: it should be shown earlier, not on button click (but that depends on your design.
Signals & Slots | Qt Core 5.12.3 - Qt Documentation
If your corresponding slot has a use for it (example: mySlot(bool isToggled)) this value will be passed to it. In your example, however, the clicked() signal does not come with any parameter - so it will not pass any data to doSomething(double *pointer) - and in truth, MOC will not allow such a connection (again - see the documentation, it's ... Slot doesnt exist in connect function in C++/Qt project ... Parameters given to the signal are passed as parameters to the slot. Emitting the signal is basically same as calling the slot (either immediately or later from event loop depending on connection type). Signals don't support return values (even if slot method has return value). – hyde Mar 29 at 17:42 Signals & Slots | Qt Core 5.12.3
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If your corresponding slot has a use for it (example: mySlot(bool isToggled)) this value will be passed to it. In your example, however, the clicked() signal does not come with any parameter - so it will not pass any data to doSomething(double *pointer) - and in truth, MOC will not allow such a connection (again - see the documentation, it's ... Signals & Slots — Qt for Python
The most common way to display a modal dialog is to call its exec() function. When the user closes the dialog, exec() will provide a useful return value. Typically, to get the dialog to close and return the appropriate value, we connect a default button, e.g. OK, to the accept() slot and a Cancel button to the reject() slot.
invoke(QObject * object, Qt::ConnectionType connectionType, QGenericReturnArgument returnValue, QGenericArgument val0 = QGenericArgument(nullptr), QGenericArgument val1 = QGenericArgument(), QGenericArgument val2 = QGenericArgument … QSslSocket Class | Qt Network 5.12.3 If no SSL support is available then this will return an undefined value.
Hi guys,. I need to do some processing inside a SLOT function but this function must have an argument, such as: @ public slot: void doSomething(double*);
While the signals and slots technology introduced by Qt is very original, what ..... 0) { // normalize the return value as well // the trick here is to make a function ... Signals and slots - BlackBerry Native
PyQt slot return value | Qt Forum Qt Development Language Bindings PyQt slot return value PyQt slot return value. This topic has been deleted. Only users with topic management privileges can see it. thumperj. last edited by . Any help with this would be appreciated, including hints on how to debug further. The pyqtSlot decorator takes a result as one of the parameters. ... 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, which is connected to syncRequestFinished() slot. Slot with return value called via Signal between differen ...