Open std Console (cout/cerr) on Qt GUI Application

main.h

#include <QApplication>

#ifdef _WIN32
#include <Windows.h>
#endif

int main(int argc, char *argv[])
{
#ifdef _WIN32
    if (AttachConsole(ATTACH_PARENT_PROCESS)) {
        freopen("CONOUT$", "w", stdout);
        freopen("CONOUT$", "w", stderr);
    }
#endif

    QApplication app (argc, argv);
    // etc..
  
  return 0;
}