I want to use QT screenshots, why after the operation without pictures appear on the surface of the table? The code below

Void MainWindow: : Screenshot ()
{
QDebug () & lt; & lt;" Screenshot ";
QScreen * screen=QGuiApplication: : primaryScreen ();
QPixmap pixmap=screen - & gt; GrabWindow (QApplication: : desktop () - & gt; WinId ());
Pixmap. Save (" C: \ \ Users \ \ 93216 \ \ Desktop ", "JPG");
}

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