Problem with Mixer API code

I'm trying to set the controls for the audio line
MIXERLINE_COMPONENTTYPE_DST_WAVEIN using the mixer APIs...
The following code gives me junk values for the LineID and szName values
for this audio line...
Can anyone tell me why??
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mmResult =
waveInOpen(&m_hWaveIn,WAVE_MAPPER,&m_waveFormatEx,(DWORD)hWnd,NULL,CALLBACK_THREAD);

  if(mmResult != MMSYSERR_NOERROR){
  printf("waveInOpen Failed!\n");
  return;
 }
 printf("waveInOpen successfully returned\n");

  mmResult =
mixerOpen(&MixerHandle,(DWORD)m_hWaveIn,0,0,MIXER_OBJECTF_HWAVEIN);
  if (mmResult != MMSYSERR_NOERROR)
  {
     printf("Device does not have mixer support! -- %08X\n", err);
   goto CloseMixer;
  }
  printf("Mixer Sucessfully opened\n");

   MIXERLINE mixerline;

  mixerLine.cbStruct = sizeof(MIXERLINE);
  mixerLine.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
  mmResult = mixerGetLineInfo((HMIXEROBJ)MixerHandle, &mixerLine,
MIXER_GETLINEINFOF_COMPONENTTYPE);
  if (mmResult != MMSYSERR_NOERROR)
  {
   printf("Device does not have a WAVE recording control! -- %08X\n",
err);
   goto CloseMixer;
  }

  printf("Line name=%s,%ld\n",mixerline.szName,mixerline.dwLineID);
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