This example calls DevCloseDC to close a device context based on the handle returned from DevOpenDC.
#define INCL_DEV /* Device Function definitions */
#include <os2.h>
HDC hdc; /* Device-context handle */
HMF hmf; /* error code (or metafile handle if
metafile device context) */
/* close the device context associated with handle hdc */
hmf = DevCloseDC(hdc);