IDirectSoundBuffer::Unlock

  • Article

This method releases a locked sound buffer.

HRESULT Unlock( 
  LPVOID lpvAudioPtr1, 
  DWORD dwAudioBytes1, 
  LPVOID lpvAudioPtr2, 
  DWORD dwAudioBytes2 
);

Parameters

  • lpvAudioPtr1
    Address of the value retrieved in the lplpvAudioPtr1 parameter of the IDirectSoundBuffer::Lock method.
  • dwAudioBytes1
    Number of bytes actually written to the lpvAudioPtr1 parameter. It should not exceed the number of bytes returned by the IDirectSoundBuffer::Lock method.
  • lpvAudioPtr2
    Address of the value retrieved in the lplpvAudioPtr2 parameter of the IDirectSoundBuffer::Lock method.
  • dwAudioBytes2
    Number of bytes actually written to the lpvAudioPtr2 parameter. It should not exceed the number of bytes returned by the IDirectSoundBuffer::Lock method.

Return Values

If the method succeeds, the return value is DS_OK.

If the method fails, the return value may be one of the following error values:

DSERR_INVALIDCALL
DSERR_INVALIDPARAM
DSERR_PRIOLEVELNEEDED

Remarks

An application must pass both pointers, lpvAudioPtr1 and lpvAudioPtr2, returned by the IDirectSoundBuffer::Lock method to ensure the correct pairing of IDirectSoundBuffer::Lock and IDirectSoundBuffer::Unlock. The second pointer is needed even if 0 bytes were written to the second pointer.

Applications must pass the number of bytes actually written to the two pointers in the parameters dwAudioBytes1 and dwAudioBytes2.

Make sure the sound buffer does not remain locked for long periods of time.

Requirements

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
Header: Dsound.h.
Link Library: Dsound.lib.

See Also

IDirectSoundBuffer | IDirectSoundBuffer::GetCurrentPosition | IDirectSoundBuffer::Lock

 Last updated on Thursday, April 08, 2004

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