QPixmap::grabWindow does not work on some machines!

[navi1084]

open the a_Buf using

a_Buf.open(QIODevice::WriteOnly);

a_Buf.open(QIODevice::WriteOnly);

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QPixmap pixmap;
         QByteArray bytes;
         QBuffer buffer(&bytes);
         buffer.open(QIODevice::WriteOnly);
         pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format

QPixmap pixmap;
         QByteArray bytes;
         QBuffer buffer(&bytes);
         buffer.open(QIODevice::WriteOnly);
         pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format

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