Can qt slot return value

c++ - Can Qt signals return a value? - Stack Overflow

C++ Tutorial: Create QT applications without QTCreator ... And slots are functions/methods that can be associated with signals - so when a signal is received - a slot function can be called. Some classes have pre-defined slots, but you can also create your own slot methods. In order to connect a QT widgets signal to another classes slot method, you need to use QT's "connect" function. Signals and Slots | Introduction to GUI Programming with ... PyQt is more versatile than C++/Qt in this regard, because we can connect not just to slots, but also to any callable, and from PyQt 4.2, it is possible to dynamically add "predefined" signals and slots to QObjects. Let's see how signals and slots works in practice with the Signals and Slots program shown in Figure 4.6.

E.g. with Qt::SingleConnection there is no risk of multiple slots, with Qt::BlockingQueuedConnection there is only one return value at a time. "Never have a return value" (doc) is different to use wisely IMHO. All the above true, there might be side effects, but still many use cases where return values …

we can test the return value (for instance, by adding an assertion), or we can make all warnings fatal by exporting the QT_FATAL_WARNINGS environment variable and setting it to a non-zero value. ... Qt 4.2: QDialog Class Reference QDialogs can provide a return value, and they can have default buttons. QDialogs can also have a QSizeGrip in their lower-right corner, using setSizeGripEnabled(). ... Exercises Lecture 2 – The Qt Object Model and Signa l Slot Mechanism

c++ connect - Qt:meaning of slot return value? - CODE Solved

qobject.cpp source code [qtbase/src/corelib/kernel/qobject.cpp ...

Qt Get Slot Return Value

PySide/PyQt Tutorial: Creating Your Own Signals and Slots - Python ... 6 Feb 2013 ... How signals and slots are useful, and what they can do when developing in ... the signals that are provided by Qt widgets, however; you can create your own. .... " Hide" the values and expose them via properties ... return self.