Qt slots with return values

Qt slots need to return void, no? QLabel::setText() is a slot, so it can't be made to return `this' (unless slot requires are changed in the future) [quote author="m.alessandrini" date="1360267667"]But actually in this case it would not be "noticed" by code calling the void-type functions, cause they already ignore the returned value.[/quote]True, the change is source-compatible. Signals and Slots with array | Qt Forum Hi, I am working with an extra workerthread in Qt which communicates with the mainwindow via Signals and Slots. This works fine so far. Now I want to send a signal containing 2 arrays from my workerthread to the mainwindow, which doesn't really work.

Interacting with QML Objects from C++ All QML object types are QObject -derived types, whether they are internally implemented by the engine or defined by third-party sources . This means the QML engine can use the Qt Meta Object System to dynamically instantiate any QML object type and inspect the created objects. Signals & Slots | Qt 4.8 Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Signals and slots can take any number of arguments of any type. QSqlTableModel — Qt for Python

PyQt/Sending Python values with signals and slots - Python ...

Connect signals to slots with constant values. Ask Question 14. 1. ... Connect QML signal to C++11 lambda slot (Qt 5) 1. How to structure signals/slots? 23. Qt signals and slots: permissions. 1. Connection from a signal to a slot returns false. 1. Connecting multiples signal/slot in a for loop in pyqt. Using partial to create slots for signals with return ... Using partial to create slots for signals with return values in PyQt. ... The slot is going to be called with a value arg, so this should line up with the signature I would think. The lambda is only necessary if you don't have control over that dialChanged slot function and you need to completely reformat the signature by wrapping around the ... How to have multiple Qt buttons return each different values I'm relatively new to Qt and I’m stuck with trying to figure out how to have different buttons each return a specific value when they're clicked.I've read through the Qt doc on signals and slots but I didn't find something useful.

An overview of Qt’s signals and slots inter-object communication mechanism. 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.

Slot with return value called via Signal between differen... |…

c++ - Qt: meaning of slot return value? - Stack Overflow

Connecting in Qt 5. There are several ways to connect a signal in Qt 5. Old syntax. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget)

I think the problem has to do with the use of the lambda function inside the for loop and scope, but I'm not sure how to otherwise go about passing the return value of the valueChanged signal into the slot created by partial. Any suggestions would be appreciated.

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Passing extra arguments to PyQt slots - Eli Bendersky's website April 25, 2011 at 13:38 Tags Python , Qt ... After all, the signal-slot connection mechanism only specifies how to connect a signal to a slot - the signal's arguments ... 5.2. How to Use the Qt API - froglogic · Documentation This is because the property returns a QString object and the script functions to print a ..... data from those Qt widgets, and perform tests against expected values.