比如我现在放一首mp3,电脑的音量肯定时刻在变化,我怎么才能够查询出当前的音量呢?我说的音量不是只右下角那个黄色小喇叭可以调节的那个音量,那个音量如果你不去动他,基本上是固定不变的。windows有没有提供什么api完成上面的功能的呢?
解决方案 »
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HMIXER m_hmx;
MIXERCAPS m_mxcaps;
MIXERLINE m_mxl;
MIXERLINECONTROLS m_mxlc;
MIXERCONTROL m_mxctrl;
ULONG cConnections,v;
mmr = mixerGetDevCaps(0, &m_mxcaps, sizeof(m_mxcaps));
if (MMSYSERR_NOERROR != mmr)
{
MessageBox("Can't Get Device Caps.");
return TRUE;
}
mmr = mixerOpen(&m_hmx, 0, (DWORD)m_hWnd, 0L, CALLBACK_WINDOW);
if (MMSYSERR_NOERROR != mmr)
{
MessageBox("Can't Open Mixer Device.");
return TRUE;
}
m_mxl.cbStruct = sizeof(m_mxl);
m_mxl.dwDestination = 0;
mmr = mixerGetLineInfo((HMIXEROBJ)m_hmx, &m_mxl, MIXER_GETLINEINFOF_DESTINATION);
if (MMSYSERR_NOERROR != mmr)
{
MessageBox("Can't Get Mixer Device Line Info For Volume Controls");
return TRUE;
}
cConnections=m_mxl.cConnections;
m_mxlc.cbStruct = sizeof(m_mxlc);
m_mxlc.dwLineID = m_mxl.dwLineID;
m_mxlc.cControls = m_mxl.cControls;
m_mxlc.cbmxctrl = sizeof(m_mxctrl);
m_mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
m_mxlc.pamxctrl = &m_mxctrl;
mmr = mixerGetLineControls((HMIXEROBJ)m_hmx, &m_mxlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
if (MMSYSERR_NOERROR != mmr)
{
MessageBox("Can't Get Line Info For Volume Controls");
return TRUE;
}
但是我MSDN查了一下,没有发现m_mxlc中那个成员表示音量的.
一句中m_hWnd是必须的吗? 我最终的程序是控制台程序,没有窗口怎么办?还有m_mxctrl.Metrics.cbCustomData我估计就是音量了,但是为什么无论我放什么mp3, 其值总为192啊, 不明白为什么~~~
MIXERCONTROLDETAILS_UNSIGNED vol; vol.dwValue=0;
mxcd.hwndOwner = 0;
mxcd.cbStruct = sizeof(mxcd);
mxcd.dwControlID = mxc->dwControlID;
mxcd.cbDetails = sizeof(vol);
mxcd.paDetails = &vol;
mxcd.cChannels = 1;
if(mixerGetControlDetails((HMIXEROBJ)hmixer, &mxcd, MIXER_OBJECTF_HMIXER|MIXER_GETCONTROLDETAILSF_VALUE))
return -1;
return vol.dwValue;
http://search.csdn.net/Expert/topic/1431/1431476.xml?temp=.8853113
waveInGetNumDevs();
waveInGetDevCaps (0, &m_WaveInDevCaps, sizeof(WAVEINCAPS));}
WaveInitFormat(1/* mono*/,m_WaveInSampleRate /* khz */,16 /* bits */);
waveInOpen( &m_WaveIn,0, &m_WaveFormat,(DWORD)
waveInPrepareHeader( m_WaveIn, &m_WaveHeader, sizeof(WAVEHDR) ); }
waveInAddBuffer( m_WaveIn, &m_WaveHeader, sizeof(WAVEHDR) );
waveInStart( m_WaveIn );
www.csdn.net/develop/Read_Article.asp?Id=9780
waveInGetNumDevs();
waveInGetDevCaps (0, &m_WaveInDevCaps, sizeof(WAVEINCAPS));}
WaveInitFormat(1/* mono*/,m_WaveInSampleRate /* khz */,16 /* bits */);
waveInOpen( &m_WaveIn,0, &m_WaveFormat,(DWORD)
waveInPrepareHeader( m_WaveIn, &m_WaveHeader, sizeof(WAVEHDR) ); }
waveInAddBuffer( m_WaveIn, &m_WaveHeader, sizeof(WAVEHDR) );
waveInStart( m_WaveIn );
www.csdn.net/develop/Read_Article.asp?Id=9780 除此之外,还要将录音源设置为“Mixer Out”或者是“Wave Out”