Draw rectangle on QImage

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Hi,

I've tried this code in the constructor of a simple program.

QImage qImage("a.bmp");
QPainter qPainter(&qImage);
qPainter.setBrush(Qt::NoBrush);
qPainter.setPen(Qt::red);
qPainter.drawRect(150,150,50,50);
bool bEnd = qPainter.end();
qImage.save("b.bmp");

QImage qImage("a.bmp");
QPainter qPainter(&qImage);
qPainter.setBrush(Qt::NoBrush);
qPainter.setPen(Qt::red);
qPainter.drawRect(150,150,50,50);
bool bEnd = qPainter.end();
qImage.save("b.bmp");

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With this I'll get the image "b.bmp" that is the same as "a.bmp" but with a red rectangle painted on position (150px,150px) with a widht and height of 50px.
This don't work as "b.bmp" is identical as "a.bmp"

Thanks,