QPixmap::grabWidget failure



  • Hi Guys,
    I'm working on to an application, and I want to used QPixmap::grabWidget function to save a pixmap of my widget. The build is well, but I have an error when I run the application:
    @ASSERT failure in QGLPainter: "begin() has not been called or it failed", file painting/qglpainter.cpp, line 770@
    This is a part of my code:
    @ QPixmap originalPixmap0 = QPixmap();

    // originalPixmap = QPixmap::grabWindow(My_Widget->winId());
    originalPixmap0 = QPixmap::grabWidget(My_Widget);@
    If I use the grabWindows, it's work well. But I want to use grabWidget to hide my widget and still have it on my Pixmap.

    Does anyone can help me to found where is came from?
    Thank you
    Don



  • I'm not sure gradWidget works with an openGL widget at all...



  • Thanks for the reply.
    Thereby, from what you said, I can not use grabWidget, and I have to used grabWindow. But, it is not possible to get a pixmap from an hidden Qwidget with grabWindow, is it?
    What I want to do is some like:
    @My_Widget->hide();
    ...
    QPixmap originalPixmap0 = QPixmap();
    originalPixmap = QPixmap::grabWindow(My_Widget->winId());@
    Using that way, I want to have a Pixmap of my widget, without displayed it on the screen. I have tried this, and the saved QPixmap was a screenshoot of my desktop, not an image of my widget.



  • I said that I doubt that it works, not that I'm sure it does not work. It would the first thing I'd look into to find the cause of your issue.

    I don't know if there are ways to render openGL into a pixmap without it being displayed on screen.



  • Thanks for your answer. I gonna have a look on this. And I hope to find a way to do this.


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