Good day. I am writing an app under QNX6.6 - screenhot of the window, on which have is widget QGLWidget.
I can not make a screenshot of the window with area of OpenGL.
Here is the code in Qt:

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QPixmap pixmap;
QString file_image;

pixmap = QPixmap::grabWidget(QApplication::activeWindow(), this->pos().x(), this->pos().y(), this->width(), this->
height());
file_image = QApplication::applicationDirPath() + "/screen_img.png");
pixmap.save(file_image, "PNG");
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The image is created, but instead of OpenGL - black area.
How in QNX6.6 get a screenshot of a window or of the entire display with area of OpenGL?