Qt can slots return value

Qt 4.8: Signals & Slots Signals and slots can take any number of arguments of any type. ... int value() const { return m_value; } public slots: void setValue(int value); signals: void ...

Debugging Qt's signal-slot connections… – Ray Rischpater, KF6GPE 13 Feb 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 ... c++ - Qt: meaning of slot return value? - Stack Overflow This is passed by QMetaObject::invokeMethod. So the return value in the moc generated code is saved and passed back to the caller. So for normal signal-slot interactions the return value is not used for anything at all. However, the mechanism exists so that return values from slots can be accessed if the slot is called via invokeMethod. c++ - Can Qt signals return a value? - Stack Overflow

Return value from slot in differnet thread | Qt Forum

How can I get return values from slot function? Several ... But once this is done you should be able to use return values without the need to manually block/synchronize these type of calls. So please keep this issue open, as a reminder for me. Also btw, in case you didn't know you can safely read from a non main thread. It's just writes that can cause trouble and therefore need the slot/signal mechanism. Qt for Beginners - Qt Wiki Qt for beginners — Finding information in the documentation. Qt documentation is a very valuable piece of information. It is the place to find everything related to Qt. But, Qt documentation is not a tutorial on how to use Qt. It is a collection of all information related to classes, as well as some examples.

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.

Signals and slots can take any number of arguments of any type. ... int value() const { return m_value; } public slots: void setValue(int value); signals: void ... 20 ways to debug Qt signals and slots | Sam Dutton's blog 3 Oct 2008 ... You can do this with code like the following: ... Check the return value of the connect statement: connect returns true if it successfully connects the signal to the slot. 17. ... Follow Qt's naming conventions for signals and slots:.

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.

Returns an object representing a built-in Qt slot QSpinBox::clear. Return value of this function can be used for creating Qt connections using qt_core::connection API. fn set_value(&self) -> SetValue. Returns an object representing a built-in Qt slot QSpinBox::setValue. qt_widgets::table_view::connection::Slots - Rust Returns an object representing a built-in Qt slot QTableView::update. Return value of this function can be used for creating Qt connections using qt_core::connection API. fn column_resized(&self) -> ColumnResized. Returns an object representing a built-in Qt slot QTableView::columnResized.

qt_widgets::spin_box::connection::Slots - Rust

Slots - PUC-Rio

How to send data through signal and slot? - Stack Overflow When you want to 'return' some value, you pass that value to signal, i. e. call 'emit signal_name(value_to_return)'. So you can treat signals as 'inverted' methods whose params are actually return values that are passed to connected slots – Kirill Gamazkov Mar 7 '14 at 10:22