GHI_CMD_EXTENSION - Syntax

Description: 

GHI_CMD_EXTENSION is optional and is called to send an extension command 
to a GRADD. The extension subfunction is placed in the ulXSubFunction 
field of the pIn input packet. 

#include <GRADD.h>

GID      gid;         /*  ID of the GRADD. */
ULONG    ulFunction;  /*  Set equal to GHI_CMD_EXTENSION. */
PVOID    pIn;         /*  Pointer to an HWEXTENSION structure. */
PVOID    pOut;        /*  Pointer to an extension-specific output structure. */
ULONG    rc;          /*  Return codes. */

rc = HWENTRY(gid, ulFunction, pIn, pOut);