Qt slot function return value

I think that the return value for a slot is only available when the function is called directly (when it is a normal C++ function) or when using invokeMethod. I think this is really meant for internal Qt functions rather than for normal use in programs using Qt. Edit: For the sample case: c++ - How can I return a value from SLOT in Qt5? - Stack ... The string returned by client is stored in a QString in readFromClient() SLOT. Problem: I have to return the QString in the slot to the newServerConn() function and from there to a function in MainWindow class because only then I would be able to print the string to the plainLineEdit widget pointed by the ui object.

The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call. QGenericArgument and QGenericReturnArgument are internal helper classes. Signals and Slots - Qt Documentation An abstract view of some signals and slots connections In Qt we have an alternative to the callback technique. We use signals and slots. A signal is emitted when a particular event occurs. Qt's widgets have many pre-defined signals, but we can always subclass to add our own. A slot is a function that is called in reponse to a particular signal. How to pass parameters to a SLOT function? | Qt Forum

Hi I have a function I use to init a socket in a different thread/class. I'd like to get a return value that tells me in the main/GUI thread if everything is ok.

Calculator Example | Qt Widgets 5.12.3 The private createButton() function is used as part of the widget construction. abortOperation() is called whenever a division by zero occurs or when a square root operation is applied to a negative number. QAbstractItemModel Class | Qt Core 5.12.3 [virtual] bool QAbstractItemModel:: setHeaderData( int section, Qt::Orientation orientation, const QVariant & value, int role = Qt::EditRole) The QtWebKit Bridge | Qt 4.8

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 ...

CommonQt is a Common Lisp binding to the smoke library for Qt. ... The function CONNECT is used to connect signals and slots in different ways: ... either call- next-qmethod can be used, when the return value is needed, or stop-overriding can ... PyQt v4 - Python Bindings for Qt v4 This module contains functions that enable unit testing of PyQt applications. ( PyQt does ..... PyQt also supports setting the values of properties (and connecting a signal to a slot) using the .... The returned value is normally passed to the QtCore. PyQt QSlider Widget and Signal - Tutorialspoint

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Qt for example is massively simplified when you do not have to create yet another slot for a minor corner case. .... To add to other posts, it also helped encapsulate "helper functions" to some bigger more complex functions. ..... Instead I write a lambda that returns the value to assign and call it in-place: PyQt QSpinBox Widget - Tutorialspoint 5. Value(). Returns the current value. 6. singleStep(). Sets the step value of counter ... The associated slot function can retrieve current value of the widget by value() method. Following example has a ... setAlignment(Qt.AlignCenter) layout. rviz: rviz::Property Class Reference - Size Public Member Functions ... Return the value of this Property as a QVariant. If the value .... This should be a Qt slot specification, generated by Qt's SLOT() macro. Qt connect function | [SOLVED] run a function in another thread - 2019 ...

It is possible for slots to return values to the QML caller ... QML functions appear as slots in Python, ... PySide; Developing with Qt::Qt Quick;

The QtWebKit Bridge | Qt 4.8 The slot onClicked() prints the value of x as stored in the form. Application Example | Qt Widgets 5.12.2 The reason is that including such a large header from another header file can rapidly degrade performances. Here, it wouldn't do any harm, but it's still generally a good idea to include only the header files that are strictly necessary from … Model/View Programming | Qt Widgets 5.12.3 Qt ::ItemFlags StringListModel ::flags( const QModelIndex &index) const { if ( !index .isValid()) return Qt ::ItemIsEnabled; return QAbstractItemModel ::flags(index) | Qt ::ItemIsEditable; }

int value() const { return m_value; } public slots: void setValue(int value); .... Now in Counter.cpp(and it has to include Counter.h), i will define thisAlso, if you're using Qt version 5.0 or higher, you should start passing function pointers to the connect methods instead of using the SIGNAL and SLOT macros. QT slot function does not get called