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. ... PyQt slot return value - forum.qt.io Reply to PyQt slot return value on Mon, 26 Jan 2015 01:55:18 GMT @pyqtSlot( result = str ) is only for the C++ declaration. you can not use the return value with an emit Event. c++ - How to send data through signal and slot? - Stack ... How to send data through signal and slot? Ask Question 1. Could someone please help how to connect signal and slot? ... Can Qt signals return a value?-1. How to pass QString variable using signals and slots in Qt? Related. 2328. How do you set, clear, and toggle a single bit? 2816. How do I iterate over the words of a string? 1.
Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks. A callback is a pointer to a function, so if you want a processing function to notify you...
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 be useful nonetheless. c++ - Qt - Return value when signal is emitted? - Stack Even though signals in Qt can indeed return values, this is rarely used, if ever. Namely because it doesn't make a lot of sense. What you probably want to do is not return but emit the image with a signal, this way you can connect it to a function that will receive the image and do something with it. c++ - QT return value from a signal? - Stack Overflow
Function with Signals & Slots | Qt Forum
Getting a return value from an emitted signal | Qt Forum
Package 'qtbase'
May 7, 2015 ... For more detailed information, see Signals & Slots on the Qt website. .... You could create a slot that returns a value or an object, but the signals ...
Sep 12, 2013 ... Since Qt 5 was released I had been putting off upgrading to Qt 5 on a project I ... We've eliminated the three slot functions that do basically the same thing ... used in the body by value) connect(pushButton, &QPushButton::clicked, .... and performs functions such as recognizing you when you return to our ...
setValue(48); // a.value() == 12, b.value() == 48 return 0; }. The SIGNAL and SLOT macro enclose their content in brackets, making it a string. Well, they do one ... Debugging Qt's signal-slot connections… – Ray Rischpater, KF6GPE Feb 13, 2012 ... What do you do if you think you've correctly connected a signal to a slot ... If need be, ensure that connect succeeds by testing its return value (it ... Slots - PUC-Rio Digia, Qt and the Digia and Qt logos are the registered trademarks of Digia Plc. in ..... A slot can return values, but not through connections. ○. Any number of ...
foreach slot in connectedSlotsForSignal(signal): value = invoke slot with parameters from signal return value. Obviously the moc does a little more toQt’s qt_metacall function returns an integer status code. Because of this, I believe this makes an actual return value impossible (unless you fudge... Как обойти то, что слот не возвращает значения? - C++ Qt… Продолжаю изучать Qt и возник очередной вопрос. Как известно, слоты в Qt не дают возможности вернуть значение, то есть являются void-функцией. Соответственно возникает вопрос: как вернуть значение посчитанной в слоте переменной? Qt: meaning of slot return value? - dskims.com According to the documentation the return value from a slot doesn't mean anything. Yet in the generated moc code I see that if a slot returnsLooking through the Qt source it seems that when a slot is called from QMetaObject::invokeMethod the return type can be specified and the return value... Qt: Return value of signal works, why is the official doc saying…