Moves the read or write pointer according to the type of move specified.

#define INCL_DOSFILEMGR
#include <os2.h>

HFILE     hFile;               /*  The handle returned by a previous DosOpen function. */
LONG      ib;                  /*  The signed distance (offset) to move, in bytes. */
ULONG     method;              /*  The method of moving. */
PULONG    ibActual;            /*  Address of the new pointer location. */
FHLOCK    fhFileHandleLockID;  /*  The filehandle lockid returned by a previous DosProtectOpen. */
APIRET    ulrc;                /*  Return Code. */

ulrc = DosProtectSetFilePtr(hFile, ib, method,
         ibActual, fhFileHandleLockID);