TBM_GETTHUMBRECTTBM_GETTHUMBRECT*
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TBM_GETTHUMBRECT


TBM_GETTHUMBRECT 
    wParam = 0; 
    lParam = (LPARAM) (LPRECT) lprc;

Retrieves the size and position of the bounding rectangle for the slider in a trackbar.

lprc
Address of a RECT structure. The message fills this structure with the bounding rectangle of the trackbar's slider, in client coordinates of the trackbar's window.

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