Release mode issue

[regular]

Hi

I have an application that builds and runs fine in Debug mode, but when ran in Release mode it produces a "Access violation reading location 0x...." error. I try to process the command line parameters passed to the application before constructing the QMainWindow and calling QApplication.exec(). I have put some qDebug() statements and it appears it crashes straight after I call any QString methods. It appears to me that there might be some linking errors but I can't seem to find the cause. Here's my main() function:

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MyWindow *mw= 0;
	QString s = QString("myHardCodedString").toLower().trimmed();
	qDebug() << s;
	if(a.argc() > 1)
	{
		qDebug() <<"before check";
		QString correctStr = MyHelper::getProgramStr();
		qDebug() <<"str: " << correctStr;
 
		qDebug() << a.arguments();
		qDebug() << a.arguments().at(1);
 
		QString res = a.arguments().at(1).toLower().trimmed();
		qDebug() << "arg: " << res;
 
                //code below never reached in Release mode
                //..........
        }
	else
	{
		QErrorMessage *error = new QErrorMessage();
                //set errormessage 
                //.........
	}
 
	return a.exec();
}

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MyWindow *mw= 0;
	QString s = QString("myHardCodedString").toLower().trimmed();
	qDebug() << s;
	if(a.argc() > 1)
	{
		qDebug() <<"before check";
		QString correctStr = MyHelper::getProgramStr();
		qDebug() <<"str: " << correctStr;

		qDebug() << a.arguments();
		qDebug() << a.arguments().at(1);
		
		QString res = a.arguments().at(1).toLower().trimmed();
		qDebug() << "arg: " << res;

                //code below never reached in Release mode
                //..........
        }
	else
	{
		QErrorMessage *error = new QErrorMessage();
                //set errormessage 
                //.........
	}

	return a.exec();
}

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The last qDebug() message before the "Access violation" error in release mode is this one:

qDebug() << a.arguments().at(1);

qDebug() << a.arguments().at(1);

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A note: I put the "myHardCodedString" string just to test if the problem was caused by QString methods. Before I put that in, the error surfaced later on in the main function, but with it there, the error occurred right after the stated qDebug() line and before the next one.

I am using Qt 4.8.3 on Windows 7 x64 and VisualStudio 2010.

Hope that's enough information and thanks in advance.

[Santosh Reddy]

Just clean build the application and make sure you are using correct version of release mode dlls when running in the release mode