c++ - How to use grabWindow to take a screenshot of only a certain region of a window? -


i using following code take screenshot of window (handle type hwnd):

qpixmap::grabwindow((wid) handle).save("haystack.png", "png");

however, need take screenshot of region (rectange) of window.

in case, rectangle has following vertices:

top-left corner: (536, 535)

bottom-right corner: (778, 592)

right documentation:

qpixmap qpixmap::grabwindow( wid window,                              int x = 0,                              int y = 0,                              int width = -1,                              int height = -1 );

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