This example calls WinMapDlgPoints to map a point from dialog coordinates to window coordinates relative to the dialog window.

#define INCL_WINDIALOGS         /* Window Dialog Mgr Functions  */
#include <os2.h>

HWND  hwndDlg;          /* handle of dialog window              */
BOOL  fSuccess;         /* success indicator                    */
POINTL aptlPoint;       /* point to be mapped                   */

/* map point to relative window coordinates */
fSuccess = WinMapDlgPoints(hwndDlg, &aptlPoint, 1, TRUE);