why"QPixmap: Must construct a Qapplication before a QpaintDevice" only in Debug mode?

[richardander]

Hello,

I upgraded my application from Qt3.3 to Qt4.4. I have the following problem when the Qt4.4 program is running.

- In release mode, it works fine;;

- In debug mode, compilation and link is ok. However, when it runs, it pops up a error message:

QPixmap: Must construct a Qapplication before a QpaintDevice.

Following is the code in my main program and the error happened at :
MainWindow smw;

But I create QApplication before it already!

- also, the release version can work ...

Can anyone help me why this happened and how to solve it?

thank you very much!

int main( int argc, char ** argv )
{
    try
    {
 
        QApplication app( argc, argv );
 
	MainWindow smw;
	app.setMainWidget( &smw );
        smw.hide();
 
        ...
     }
     ...
}

int main( int argc, char ** argv )
{
    try
    {

        QApplication app( argc, argv );

	MainWindow smw;
	app.setMainWidget( &smw );
        smw.hide();

        ...
     }
     ...
}

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