Mixer problem

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#867

From: George Nemeth
Date: Fri, 07 Mar 2003 15:20

31 lines
2198 bytes

I am having problems with the mixer devices under win98. The following 
code works fine with win95 and nt4, but the call to

auxGetNumDevs() returns 0 all the time when run under win98.  We tried several machines with the same result. Can anyone shed an light on why, OR suggest a different method of controlling the mixer.  We simply need to lower the line in audio level, play a wav and then restore the line in back to the level it was previously at. 

int TStation::GetLineInDevice()
{
  //return # that identifies line in dev in aux dev list
  AUXCAPS auxcaps;
  int nDevId;
  int nNbrAuxDevices = auxGetNumDevs();  //<--always returns zero under win98
  int rc;
  bool found = false;

  for(nDevId = 0; nDevId < nNbrAuxDevices; nDevId++) {
    rc = auxGetDevCaps(nDevId, &auxcaps, sizeof(auxcaps));
    if(rc == MMSYSERR_NOERROR &&
       (auxcaps.wTechnology & AUXCAPS_AUXIN) &&
       (auxcaps.dwSupport & AUXCAPS_VOLUME)) {
      ShowMessage("Got Aux In");
      found = true;
      break;
    }
  }

  if(found) {
    return nDevId;
  } else {
    return -1;
  }
}

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