Why does this slot get called twice?
c++, qmenubar, qt4
Solution
I get the same incorrect result as you on Windows 7 x64 using Qt 4.8.1. This certainly seems like a bug.
There was a bug reported and fixed for what appears to be the same behavior on Mac OS X. Although it has been closed, there is a single comment on it that they observed this problem on Windows 7.
I think filing a new bug report would be a good idea.
Problem
My problem is that when I click on an item in a QMenuBar, the corresponding slot gets called twice. I'm using Qt 4.8.1. I'm not using Qt Designer nor the "auto-connection" feature. Here is my code snippet : ``` #include <iostream> #include <QWidget> #include <QMenuBar> class MyWidget : public QWidget { Q_OBJECT public: MyWidget(QWidget *parent = 0) : QWidget(parent) { QMenuBar *menu = new QMenuBar(this); menu->addAction("Click here"); menu->addAction("Or here"); connect(menu, SIGNAL(triggered(QAction*)), this, SLOT(handleAction(QAction*))); } public slots: void handleAction(QAction *action) { std::cout << "Triggered" << std::endl; } }; ``` And the main function : ``` #include "main.h" #include <QApplication> int main(int argc, char **argv) { QApplication app(argc, argv); MyWidget w; w.show(); return app.exec(); } ``` If you compile this (with the MOC file), you'll see that clicking on "Click here" will print "Triggered" once, and "Or here" twice. I don't understand why. What am I doing wrong ?