how to use bitBlt in QT 3

[garry_3peace]

I have try to use bitBlt but it seems failed. the "buffer" is null. Is there any problem with the code?

QImage hehe("f_rain1m_e5bff66.jpg" );
    QImage buffer;
    bitBlt(&buffer, 4, 5 , &hehe, lstBox->x(), lstBox->y(), lstBox->width(), lstBox->height(), CopyROP);
    lstBox->setPaletteBackgroundPixmap(buffer);
    qWarning("%d",buffer.isNull());

QImage hehe("f_rain1m_e5bff66.jpg" );
    QImage buffer;
    bitBlt(&buffer, 4, 5 , &hehe, lstBox->x(), lstBox->y(), lstBox->width(), lstBox->height(), CopyROP);
    lstBox->setPaletteBackgroundPixmap(buffer);
    qWarning("%d",buffer.isNull());

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NB:
The result in terminal is 1 which mean the buffer is still null, right?