Use maybeNick from Utils, fixes empty nickname inserted in ROOMS protocol command parameters. Not tested, but builds, and it's Haskell...
#include <QApplication>
#include "mainform.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWindow *mainWin = new MyWindow;
mainWin->show();
return app.exec();
}