Cannot create a QWidget when no GUI is being used

[Teerayoot]

I got debug error when try to show simple widget subclass
inside dll

error

Debug Error
QWidget:Cannot create a QWidget when no GUI is being used

Debug Error
QWidget:Cannot create a QWidget when no GUI is being used

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How make GUI being used?

here simple test code.

QCoreApplication *coreApp ;
void MyThread::run()
{
 
	int notUse;
	coreApp = new QCoreApplication(notUse,0);
 
	QString fileName = qApp->applicationDirPath()+"/test.txt";
	qDebug(fileName.toLocal8Bit());
	//QFile file(fileName,coreApp);
	//file.open(QIODevice::ReadWrite);
	//file.write("Hello's world",sizeof("Hello's world"));
	MyGui gui;
	gui.show();
	coreApp->exec();
}
 
BOOL APIENTRY DllMain( HMODULE hModule,
					  DWORD  ul_reason_for_call,
					  LPVOID lpReserved
					  )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		{
			MyThread *myThread = new MyThread;
			myThread->start();
			break;
		}
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}

QCoreApplication *coreApp ;
void MyThread::run()
{
	
	int notUse;
	coreApp = new QCoreApplication(notUse,0);
	
	QString fileName = qApp->applicationDirPath()+"/test.txt";
	qDebug(fileName.toLocal8Bit());
	//QFile file(fileName,coreApp);
	//file.open(QIODevice::ReadWrite);
	//file.write("Hello's world",sizeof("Hello's world"));
	MyGui gui;
	gui.show();
	coreApp->exec();
}

BOOL APIENTRY DllMain( HMODULE hModule,
					  DWORD  ul_reason_for_call,
					  LPVOID lpReserved
					  )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		{
			MyThread *myThread = new MyThread;
			myThread->start();
			break;
		}
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}

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Show gui at DLL_PROCESS_ATTACH
also got same debug message
Thank.

[marcel]

QCoreApplication is not part of QtGui, but QApplication is.
Try using that.

[Teerayoot]

Rock!
I can using gui inside dll for now .
Thank.