want to hide mainwindow at program start up

[FelixB]

but i need further better solution

there you go:

override showEvent for your MainWindow and check your condition there...

[ferdna]

QWidget *m;
  if (condition)
     m = new dlgMain1();
  else
     m = new dlgMain2();
 
m->show();

QWidget *m;
  if (condition)
     m = new dlgMain1();
  else
     m = new dlgMain2();

m->show();

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[CodeLurker]

This one had been biting me on the hiney for some time, so I thought I'd share what I went with.

If you do a "hide()" in the ctor, and then yer main looks like:

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    return a.exec();
 }

#include <QtGui/QApplication>
#include "mainwindow.h"
     
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
     
    return a.exec();
 }

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what you have done is told it to hide(), and then show(). That won't work. I made a public variable in my subclassed QMainWindow, so that I do something similar to:

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
 
    if (w.bRunHidden)
        w.hide();
    else
        w.show();
 
    return a.exec();
}

#include <QtGui/QApplication>
#include "mainwindow.h"
     
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;

    if (w.bRunHidden)
        w.hide();
    else
        w.show();
     
    return a.exec();
}

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It also doesn't run right without the hide(). I do realize that this doesn't address your problem of showing the other form. If the parent is not visible, neither will the child be. Thus, you would have to make a parentless form, which makes sense on Windows, in any event. It will create its own taskbar entry. You will have to keep up with it's hiding and showing, however. If a user makes the MainWindow visible, and then minimizes it, your child form may need to be hidden too; and restore when the parent is restored. Depending on what you are doing, you might be taking the wrong approach. I made a serial number screen for a prog I'm working on; and simply created it, showed it and dealt with the response in the main, before I ever created the MainWindow. Also, I suppose making that a function is better form.