[Openal] alSourceQueueBuffers Report Error

[steve]

Hi:

My program runs fine on release version. But OpenAL reports error on my
debug version.

I am trying to play recoded voices continueously, so I queue the buffer
while the souce is playing.
 
For Debug version, I got an "Invalid operation" error from OpenAL and an
exception is thrown.
Note that my release verison runs fine.

Could someone tell me what's wrong with my program?
Thank you very much.

Steve

==========================================
My code:

class Buffer
{
    ALuint  m_id[8];  // OpanAL id, 
};

class Source
{
    ALuint  m_id;  // OpanAL id, 
};

  void Source::QueueBuffer (Buffer *pBuf)
  { 
    ALint id = pBuf->Id ()[0];
    alSourceQueueBuffers (m_id, 1, (const ALuint*)&id); 
	ALErrorCheck  ();
  }

  void Source::ALErrorCheck ()
  {
    int error = alGetError ();
    if (error != AL_NO_ERROR)
    {
      char szErr[512];
      MakeErrorString (szErr, "", error);
      throw string (szErr);
    }
  }