Windows环境下的麦克风录音系统

Windows环境下的麦克风录音系统(11)  // if you invoke any member function return error/false please
 // use this function to get the result...
 DWORD    __getLastError();

 //
 // when the capture buffer is filled please invoke this function to 'add buffer'(Actually
 // you should create two-circular buffers,when 1st buffer is filled then switch to 2st,1st
 // buffer will be wrote into wav file.
 //
 void AddBuffer();
 
 virtual ~CSoundIn();
 
 friend CSoundIn & theSoundCapture();
private:

 BOOL  GetBestWaveFormat(WAVEFORMATEX & waveFormatEx);
 
 // because sound card is one and only so i must limit the number of CSoundIn object,
 // but how to limit the class object nums?maybe put constructor into private scope is
 // a good idea,:-)
 CSoundIn(); 

private:
 WAVEINCAPS  m_WaveInDevCaps;
 HWAVEIN  m_WaveIn;
 WAVEHDR  m_WaveHeader;
 WAVEFORMATEX m_WaveFormat; 
 
 UINT    m_WaveInSampleRate;
 int         m_NbMaxSamples;
 UINT    m_SizeRecord;

 DWORD   m_dwLastError;

 enum { MAX_SIZE_INPUT_BUFFER = 1 * 2 * 1024 }; // samples * voie * size_samples

public:
 SHORT  InputBuffer[MAX_SIZE_INPUT_BUFFER];   // used for int FFT,many GUI application
                                                                                                          // want to display sound peak so..