使用DirectSound播放声音，改变Volume和Frequency没任何效果！

[ZM]

CreateSoundBuffer的地方：

	DSBUFFERDESC dsbdesc;

	// Set up DSBUFFERDESC structure.
	memset(&dsbdesc, 0, sizeof(DSBUFFERDESC)); // Zero it out.
	dsbdesc.dwSize = sizeof(DSBUFFERDESC);
	// Need controls (pan, volume, frequency).
	dsbdesc.dwFlags = DSBCAPS_CTRLPAN | DSBCAPS_CTRLVOLUME | DSBCAPS_CTRLFREQUENCY;		// assumes that the sound is played often
	dsbdesc.dwBufferBytes = pcmwf->nSamplesPerSec * pcmwf->nBlockAlign;;
	dsbdesc.lpwfxFormat = pcmwf;    // Create buffer.
	HRESULT hRes;
	if( DS_OK != (hRes = m_lpDirectSound->CreateSoundBuffer(&dsbdesc, &m_pDsb, 0)) ) {
		// Failed.
		DSError(hRes);
		m_pDsb = 0;
		return FALSE;
	}

改变Volume和Frequency的地方：

	m_pDsb->SetVolume(&dwVol);

	m_pDsb->SetFrequency(dwFreq);

大家帮帮忙，先谢了！

[无言猪]

SetCooperativeLevel设置的是什么级别? DSSCL_PRIORITY?

[ZM]

[Quote=引用 1 楼 lostying 的回复:]

SetCooperativeLevel设置的是什么级别? DSSCL_PRIORITY?
[/Quote]
m_lpDirectSound->SetCooperativeLevel(pWnd->GetSafeHwnd(), DSSCL_NORMAL);
设置成normal的，这个要怎么设置？

[无言猪]

要设置成DSSCL_PRIORITY或者以上级别才行.

[ZM]

[Quote=引用 3 楼 lostying 的回复:]

要设置成DSSCL_PRIORITY或者以上级别才行.
[/Quote]
恩，现在已经工作正常了，谢了！