4.4.3 Windows - Missing MainWindow when starting Application on other machine

[nando76]

Hi,

i have an executable which works fine. When started it shows a MainWindow and a login (q)dialog (which prompts the user to enter username/password).
Everything works fine.

When i now copy the complete directory which contains the executable an all Qt DLLs + mingw DLL to another host which has not Qt installed, OR when i create an installer package (with nsis or installJammer)
and install it on another host the MainWindow does not appear if the executable is started....
Very strange......

I start the executable and only the login dialog comes up......After logging in (the dialog exec finishes) the MainWindow pops up....
How can there a different behaviour between host where it has been compiled and another machine?

Any ideas?

Marco

[wysota]

Can we see the code of your main()?

[nando76]

Hi,
sure....
here is my main:



int main(int argc, char **argv)
{
// Prepare log system
CConsoleLog *pConsoleLogger = new CConsoleLog;

std::string Prefix("test");
CFileLog *pFileLogger = new CFileLog(Prefix, false);

CLog::instance()->registerLogDevice(pConsoleLogger);
CLog::instance()->registerLogDevice(pFileLogger);

CLog::instance()->enableDEBUG(true);
CLog::instance()->enableMESSAGE(true);
CLog::instance()->enableWARNING(true);
CLog::instance()->enableERROR(true);
CLog::instance()->enableFATAL(true);

QString Application (QString(Flightbook::APP_STRING) + " ");

FlightbookManager::instance().setApplicationTitle( Application);


LOG_MESSAGE("Starting " << argv[0] <<
" compiled: " << __DATE__ << ", " << __TIME__);

QApplication App(argc, argv);

#ifdef WIN32
QApplication::setStyle(new QWindowsVistaStyle);
// QApplication::setStyle(new QWindowsStyle);
#endif


QCoreApplication::setOrganizationName("TEST");
QCoreApplication::setOrganizationDomain("test123.de");
QCoreApplication::setApplicationName("TEST APP");

QPalette Palette;
Palette.setColor(QPalette::Highlight, QColor(1,1,255,200));
Palette.setColor(QPalette::HighlightedText, QColor(255,255,255));
App.setPalette(Palette);

App.setWindowIcon(QIcon(":/images/applicationicon.png"));
int ret = 0;
{

MainWindow *pMainWin = new MainWindow;
pMainWin->show();

QPixmap Splash(":/images/splash.png");
QSplashScreen *pSplash = new QSplashScreen(Splash);

pSplash->showMessage(Application, Qt::AlignLeft|Qt::AlignBottom,
QColor(255, 255, 255));
pSplash->show();
if(!pMainWin->initialize()) {
LOG_FATAL("Couldn't initialize, aborting...");
shutdown();
return 1;
}

pSplash->finish(pMainWin);

delete pSplash;

pMainWin->login("");

ret = App.exec();

delete pMainWin;

shutdown();
}

return ret;
}

[wysota]

In this code I can only see one window that has a chance of being visible - pMainWin. Which is the other one?

[nando76]

the main window:

class MainWindow : public QMainWindow
{
Q_OBJECT
....


and in the main.cpp the login method of mainwinow is called which creates the
login dialog (QDialog) :


bool
MainWindow::login(const QString &DefaultPilot, bool bInitialLogin)
{
Flightbook::centerInDesktop(*this);

if(m_pLoginDialog)
{
delete m_pLoginDialog;
}

m_pLoginDialog = new LoginDialog(DefaultPilot);
.....


So the login dialog always appears. Only the MainWindow isn't shown on virgin machins (with no Qt installed).....
After login winow finishes first time the MainWindow comes up...

nando

[wysota]

Do you use exec() or show() to show the login dialog?

[nando76]

Hi,

i use exec

nando

[wysota]

In that case you are probably suffering from QApplicaton::quitOnLastWindowClosed. Set it to false and see if it makes a difference.