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http://social.msdn.microsoft.com/Forums/en-US/windowspro-audiodevelopment/thread/5ce74d5d-2b1e-4ca9-a8c9-2e27eb9ec058
it's work in Delphi 7
//////////////////////////
unit MMDevApi;
interface
uses
  Windows, ActiveX, ComObj;
const
  CLASS_IMMDeviceEnumerator             : TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
  IID_IMMDeviceEnumerator               : TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
  IID_IMMDevice                         : TGUID = '{D666063F-1587-4E43-81F1-B948E807363F}';
  IID_IMMDeviceCollection               : TGUID = '{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}';
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  LPVOID = Pointer;
  LPPER_IO_OPERATION_DATA = ^ PER_IO_OPERATION_DATA ;
  PER_IO_OPERATION_DATA = packed record
    Overlapped: OVERLAPPED;
    DataBuf: TWSABUF;
    Buffer: array [0..1024] of CHAR;
    BytesSEND: DWORD;
    BytesRECV: DWORD;
  end;
ÉÏÃæµÄ½á¹¹ÖÐOverlapped: OVERLAPPED;ºÍDataBuf: TWSABUF;Êǹ̶¨µÄ½á¹¹ÀàÐÍ¡£Buffer: array [0..1024] of CHAR;ÊÇÓÃÀ´±£´æ½ÓÊÜÊý¾ÝµÄ»º´æ¡£BytesSEND: DWORD;ÓÃÀ´±êÖ¾·¢ËÍÊý¾ÝµÄ³¤¶È¡£BytesRECV: DWORD;ÓÃÀ´±êÖ¾½ÓÊÜÊý¾ÝµÄ³¤¶È¡£ÒòΪÍê³É¶Ë¿ÚµÄ¹¤×÷ÕßÏ߳̿ÉÒÔ½ÓÊܵ½À´×Ô¿Í»§¶ËµÄÊý¾Ý£¬Í¬Ê±»¹¿ÉÒÔ½ÓÊܵ½×Ô¼º·¢Ë͸ø¿Í»§¶ËµÄÊý¾Ý£¬ ......
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