dx8 sound sample using a double pointer to traverse list question!

Graphics and GPU Programming Programming

Started by GekkoCube November 01, 2003 12:34 PM

-1 comments, last by GekkoCube 20 years, 5 months ago

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November 01, 2003 12:34 PM

The source below traverses a linked list of directsound8 buffers and resumes them all for playback. my question: why did they use... BufferQueueNode** ppNode; instead of... BufferQueueNode* ppNode; ...?


BufferQueueNode** ppNode;
   
   for( ppNode = &m_pBusyBuffersHead; (*ppNode); )
   {
      DWORD dwStatus;
      (*ppNode)->pBuffer->GetStatus( &dwStatus );

      // If the buffer is playing

      if((dwStatus & DSBSTATUS_PAUSED))
      {
         (*ppNode)->pBuffer->Pause(DSBPAUSE_RESUME);
      }
      else
      {
         ppNode = &(*ppNode)->pNext;
      }
   }