DDCMD_READ - Example Code

The following code illustrates the PDD ready to receive an empty buffer from the stream handler.

#include        "os2.h"
#include        "os2me.h"
#include        "shdd.h"

  ULONG           ulRC;              /* Error return code            */
  HSTREAM         hstream;           /* Stream handle                */
  DDCMDREADWRITE  ddcmdpb;           /* Parameter block              */
  PDDCMDFN        pddcmdfn;          /* Pointer to DDCMD entry point */
  PVOID           pBuffer;           /* Pointer to buffer            */

                            .
                            .
                            .
/*-------------------------------------------------------------------*/
/*  Perform a read from the physical device driver.                  */
/*-------------------------------------------------------------------*/
  ddcmdpb.ulFunction = DDCMD_READ;
  ddcmdpb.hstream = hstream;
  ddcmdpb.pBuffer = pBuffer;
  ddcmdpb.ulBufferSize = 32768;

  if (ulRC = pddcmdfn (&ddcmdpb))
    return (ulRC);    /* error!*/