Qt connect signal slot twice

New Signal Slot Syntax - Qt Wiki

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. c++ - Qt: QLineEdit editingFinished signal twice when ... In my case I am a bit stuck as I am getting the editFinished signal twice even when my slot handler is doing nothing. For a test, I have an array of QLineEdit which use a signalMapper to connect the editingFinished() signals to a single slot. The signalMapper passes the array index so I can see where the signal came from. eg: show - Qt PushButton Signals and Slots - Stack Overflow I'm pretty much a beginner at Qt. Anyway, I'm trying to use signals and slots to show a widget once the button is pressed. I created the widget, and have the connect() thing all done, but what do I...

Mapping Many Signals to One - Qt Documentation

All the information (slot to call, parameter values, ...) are stored inside the event. Copying the parameters. The argv coming from the signal is an array of pointers to the arguments. The problem is that these pointers point to the stack of the signal where the arguments are. Once the signal returns, they will not be valid anymore. SignalsandSlots in C++ - sigslot - C++ Signal/Slot Library

Qt Signal Connect Problem | Forum

Сообщества (371) c++ qt qt-signals slot. QT Connect Slot/Signal не работает. У меня возникли проблемы с подключением сигнала к слоту в следующем коде: #include "myserver.h". Разработка приложений на Qt. Часть 5 - Механизм сигналов…

In PyQt, connection between a signal and a slot can be achieved in different ways. Following are most commonly used techniques − QtCore.QObject.connect(widget, QtCore.SIGNAL(‘signalname’), slot_function) A more convenient way to call a slot_function, when a signal is emitted by a widget is as follows − widget.signal.connect(slot_function)

I'm pretty much a beginner at Qt. Anyway, I'm trying to use signals and slots to show a widget once the button is pressed. I created the widget, and have the connect() thing all done, but what do I... New Signal Slot Syntax - Qt Wiki