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NET_DVR_API BOOL __stdcall NET_DVR_SetPlayDataCallBack(LONG lPlayHandle,void(CALLBACK *fPlayDataCallBack) (LONG lPlayHandle, DWORD dwDataType, BYTE *pBuffer,DWORD dwBufSize,DWORD dwUser),DWORD dwUser);
public delegate void PlayDataCallBack(int lPlayHandle, uint dwDataType, ref byte pBuffer, uint dwBufSize, uint dwUser);
public static extern bool NET_DVR_SetPlayDataCallBack(int lPlayHandle,PlayDataCallBack x,uint dwUser);
public delegate void PlayDataCallBack(int lPlayHandle, uint dwDataType, [In,Out]byte[] pBuffer, uint dwBufSize, uint dwUser);
unsafe public delegate void PlayDataCallBack(int lPlayHandle, uint dwDataType, byte *pBuffer, uint dwBufSize, uint dwUser);
public delegate void PlayDataCallBack(int lPlayHandle, uint dwDataType, byte[] pBuffer, uint dwBufSize, uint dwUser);