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clear the Qwidget window using window id

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Hi, Is there any way to clear/refresh the window (QWidget) by making use of window id. this is the code i am using. Please help. Process1: QX11EmbedContainer *Cont = new QX11EmbedContainer; qDebug()<<"Cont Addr"<<Cont; QProcess *Proc1 = new QProcess(Cont); QStringList Arguments; Arguments<<QString::number(Cont->windId()); Proc1->start(someappproc, Arguments); Process2: QApplication qApp(argc, argv); QString s_WinId(qApp.arguments()[1]); WId l_WinId = sWinId.toLong(); QWidget *temp = QWidget ::find(l_Winid); qDebug()<<"temp Addr"<<temp; The problem i am facing is , some times the contents(images/video) displayed on the window are not cleared even though the application is terminated. I thought of accessing the address and try to use QPalette or something to change the color to black so that the window is cleared, but i am not able to access it from another process , and we cannot do that, i referred from here http://stackoverflow.com/questions/17319853/can-qwidgetfind-find-widgets-from-a-different-process i would like to clear the contents displayed on the window using the s_WinId or l_WinId. i found that in the application side they are using “gst_x_overlay_set_window_handle” to embed a window inside another, is there any function available to clear the window using window Id.

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