This function sends a media control interface command string to a media device. It also contains a 16-bit entry point.

#define INCL_MCIOS2
#include <os2.h>

PSZ       pszCommandBuf;    /*  Media control command string. */
PSZ       pszReturnString;  /*  Application-supplied buffer. */
USHORT    usReturnLength;   /*  Bytes reserved. */
HWND      hwndCallBack;     /*  Window handle. */
USHORT    usUserParm;       /*  User-specified parameter. */
ULONG     rc;               /*  Return code. */

rc = mciSendString(pszCommandBuf, pszReturnString,
       usReturnLength, hwndCallBack, usUserParm);