This function returns the length of the CODEC procedure name.

#define INCL_MMIOOS2
#define INCL_MMIO_CODEC
#include <os2.h>

PCODECINIFILEINFO    pCODECIniFileinfo;  /*  Pointer to CODECINIFILEINFO structure. */
PULONG               pulNameLength;      /*  # of bytes. */
ULONG                rc;                 /*  Return codes. */

rc = mmioQueryCODECNameLength(pCODECIniFileinfo,
       pulNameLength);