How does Qt5 redirect qDebug() statements to the Qt Creator 2.6 console

Question

After searching around for a reason that qDebug() statements work fine with Qt\'s standard message handler but fail when I switch to my own, I\'m appealing here to see if an

Answer 1

As Frank Osterfeld mentioned in his comment:

On windows, qDebug() uses the debug channel, not stderr.

After delving into the QDebug code and QMessageLogger I've found my answer. The handy WinAPI function OutputDebugString.

Usage (Modified from peppe's):

#include 
#include 
#include 

#include 
#include 
#include 

void MyMessageOutput(QtMsgType Type, const QMessageLogContext& Context, const QString &Message)
{
    OutputDebugString(reinterpret_cast(Message.utf16()));
}

int main(int argc, char **argv)
{
    // A GUI application
    QApplication app(argc, argv);

    // Custom handler
    qInstallMessageHandler(myMessageOutput);
    qDebug() << "Printed in the console using my message handler in a windows GUI application";

    // Default handler
    qInstallMessageHandler(0);
    qDebug() << "Also printed in the console!";

    // Show GUI here
    //MainForm *MF = new MainForm();
    //MF->show();

    return app.exec();
}