DDCMD_CONTROL - Example Code

The following code illustrates the stream handler requesting the PDD to stop its current task, for example, the PDD stops playing audio.

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

  ULONG         ulRC;                      /* Error return code      */
  HSTREAM       hstream;                   /* Stream handle          */
  DDCMDCONTROL  ddcmdpb;                   /* Parameter block        */
  PDDCMDFN      pddcmdfn;                  /* Pointer to DDCMD entry
                                              point                  */
                            .
                            .
                            .
/*-------------------------------------------------------------------*/
/*  The stream handler directs the physical device driver to stop.   */
/*-------------------------------------------------------------------*/
  ddcmdpb.ulFunction = DDCMD_CONTROL;
  ddcmdpb.hstream = hstream;
  ddcmdpb.pParm = NULL;
  ddcmdpb.ulParmSize = NULL;
  ddcmdpb.ulCmd = DDCMD_STOP;

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