[Solved] Problem with signal/slot carrying pointer - qt ... I have class A, which dynamically allocates an instance of class B when a method is called, and emits a signal which carries the instance of B. In another class named handler, I have a slot which recives an object of type B. And in the main function, I connect them like this: connect(a, SIGNAL(changed(B*)), handler, SLOT(process(B*))); c++ - Qt: Calling MainWindow::Ui from another class using signals... Connecting a signal from client.cpp to a slot in mainwindow.cpp worked very well. But when I added a ui->statusBar->showMessage("message"); in the slot, it didn't work. NOTE: When I made the signal and the slot both in mainwindow.cpp it worked, but calling a slot from mainwindow.cpp from a signal and connect() in client.cpp doesn't work. Slots and Signals in QT – how to connect from another class So I use QT Designer for the User Interface (UI), and convert this to python using “pyuic5” which generates a ui.py file As this file gets overwritten every-time I make any changes to the UI, I would like to to have another .py file which has a signal/slot class and I can program there without any worries about copy/paste issues to/from the auto-generated ui.py file.
I'm currently trying to use Object::connect to call a slot that is defined in another class. The call is as follows: connect(ui->pbMenu, SIGNAL(clicked()), this, SLOT(master->changeForm(menu))); I'm doing it like this as I have several forms that I need to change between, and I don't to redefine the slot in every class/form when I could use a ...
Detailed Description. The QThread class provides a platform-independent way to manage threads.. A QThread object manages one thread of control within the program. QThreads begin executing in run(). By default, run() starts the event loop by calling exec() and runs a Qt event loop inside the thread. You can use worker objects by moving them to the thread using QObject::moveToThread(). How to Use Signals and Slots - Qt Wiki A developer can choose to connect to a signal by creating a function (a slot) and calling the connect() function to relate the signal to the slot. Qt's signals and slots mechanism does not require classes to have knowledge of each other, which makes it much easier to develop highly reusable classes. QTimer Class | Qt Core 5.7
Signals and Slots - Qt Documentation
We will later call the slot startCppTask() from QML, which executes the internal doCppTask() method. You can e.g. run calculations in another thread at this point to avoid blocking the QML UI while performing the task. This is useful for any cpu-intense or long-lasting operation you want to handle in C++.
Connect Qt QML and C++ - wisol technologie GmbH
Connect signal to slot from different class - Qt Centre Forum Dec 10, 2015 ... Hi, I have a signal that I want to connect to a slot found in a different class. How do I do that? What I thought I could do: Class A header: #include ... Signals & Slots | Qt Core 5.12.3 - Qt Documentation Signals and slots are loosely coupled: A class which emits a signal neither knows .... If on the other hand you want to call two different error functions when the ...
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.
Using the Meta-Object Compiler (moc) | Qt 5.12.2 If the class declaration is found in the file myclass.h, the moc output should be put in a file called moc_myclass.cpp. This file should then be compiled as usual, resulting in an object file, e.g., moc_myclass.obj on Windows.
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. Qt signals and slots in different classes - Stack Overflow