There is no equivalent of the Q_INVOKABLE macro of Qt since PySide2 slots can actually have return values. If you need to create a invokable method that returns some value, declare it as a slot, e.g.: How to return a value from one slot to another | Qt Forum @SGaist @koahnig Slightly updated my original post to make it clear. 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. Using QML Bindings in C++ Applications | Qt 4.8 Notice the Q_RETURN_ARG() and Q_ARG() arguments for QMetaObject::invokeMethod() must be specified as QVariant types, as this is the generic data type used for QML functions and return values. To call a C++ function from QML, the function must be either a Qt slot, or a function marked with the Q_INVOKABLE macro, to be 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.
Qt хорошо известен своим механизмом сигналов и слотов. Но как это работает? В этом посте мы исследуем внутренности QObject и QMetaObject и раскроем их работу за кадром. Я буду давать примеры
Mar 13, 2016 ... I still work on it, keeping up-to-date with Qt and C++ as much as possible, and .... The one we'll use here is [=] which says to capture all variables from the local scope by value. ... We leave out the return type so void is inferred. How C++ lambda expressions can improve your Qt code - Medium Jan 25, 2017 ... How C++ lambda expressions can improve your Qt code ... for(int value : vect) { std::cout << value << std::endl; } return 0; } .... public slots: Qt 4.8: Signals & Slots Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot ... int value() const { return m_value; } public slots: void setValue(int value ); ...
c++ - Can Qt signals return a value? - Stack Overflow
... int value() const { return m_value; } public slots: void setValue(int value); signals: void valueChanged(int newValue); ... Qt 5 and C++11: Lambdas Are Your Friend | Custom Software ...
PyQt/Sending Python values with signals and slots - Python
Signals and Slots. Signals and slots are used for communication between objects. The signal/slot mechanism is a central feature of Qt and probably the part that differs most from other toolkits. In GUI programming we often want a change in one widget to be notified to another widget. Function with Signals & Slots | Qt Forum @gabor53 You should read again about Qt signals/slots. They are used for asynchronous communication and to react on user interactions. That means if you connect the clicked() signal of a button to a slot that slot will be called when user presses the button. How to Expose a Qt C++ Class with Signals and Slots to QML In contrast to the previous example, our new class also uses a return value for the increment slot. No further adjustments are required to receive the return value in QML. Qt automatically maps basic C++ types to QML types for all method parameters and return values. [Solved] Return value from dialog | Qt Forum
Qt Test Overview | Qt Test 5.12.2
Lambda Expressions and Qt 4.x - Silmor.de bool myComparison(const MyStruct&a,const MyStruct&b) { return a.member ... ()>l,QObject* parent = 0):m_ptr(l){} public slots: void call(){if(m_ptr) m_ptr();} }; ... are copied (the lambda knows its context by value instead of by reference), but that ...
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