Problem with mixed statically/shared Qt

[kernel_panic]

maybe it could be easier if you give us some code.

anyway, if "QWidget: Must construct a QApplication before a QPaintDevice" is sent, it mostly means, that you didn't construct a QApplication.

did you write a main file with contents similar to this:

#include <QApplication>
#include "MainWindow.h"
 
 
int main(int argc, char *argv[])
{
	int exec;
 
	QApplication app(argc, argv);
 
 
	MainWindow mainWindow("Test");
	mainWindow.show();
 
	exec = app.exec();
	return exec;
}

#include <QApplication>
#include "MainWindow.h"


int main(int argc, char *argv[])
{
	int exec;

	QApplication app(argc, argv);
	

	MainWindow mainWindow("Test");
	mainWindow.show();
	
	exec = app.exec();
	return exec;
}

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sry for my bad english!

[WinchellChung]

Thank you, I did have main file similar to that.

I managed to solve the problem. As I feared, it was because I was creating an application with Qt statically linked into it, and the application was using a Dll which was using Qt as a shared library.

So the Dll tried to create some Qt widgets, and the shared Qt library could not find a running instance of a Qt application (because it was hidden in the statically linked main application).

Because I was in a hurry, I solved the problem by copying all the code in the Dll into my main application, which fixed the problem. A very ugly quick-and-dirty solution, but it worked.