//////////////////////////////////////////////////////////////////////////
// 音量调节函数
//////////////////////////////////////////////////////////////////////////
// 调节系统音量
//--------------------------------------------------------------------------
// 函数： SetVolume(int AudioIndex,long NewPos);
// 参数： AudioIndex 是音频设备的序列，默认的设备就是0
// 参数： NewPos： 音量大小，1--100之间
//---------------------------------------------------------------------------
#include <mmsystem.h>
bool GetVolumeControl( HMIXER hmixer ,long componentType,long ctrlType,MIXERCONTROL* mxc)
{
MIXERLINECONTROLS mxlc;
MIXERLINE mxl;
mxl.cbStruct = sizeof(mxl);
mxl.dwComponentType = componentType;
if(!mixerGetLineInfo((HMIXEROBJ)hmixer, &mxl, MIXER_GETLINEINFOF_COMPONENTTYPE))
{
mxlc.cbStruct = sizeof(mxlc);
mxlc.dwLineID = mxl.dwLineID;
mxlc.dwControlType = ctrlType;
mxlc.cControls = 1;
mxlc.cbmxctrl = sizeof(MIXERCONTROL);
mxlc.pamxctrl = mxc;
if(mixerGetLineControls((HMIXEROBJ)hmixer,&mxlc,MIXER_GETLINECONTROLSF_ONEBYTYPE))
return 0;
else
return 1;
}
return 0;
}
//---------------------------------------------------------------------------
unsigned GetVolumeValue( HMIXER hmixer, MIXERCONTROL *mxc)
{
MIXERCONTROLDETAILS mxcd;
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;
}
//---------------------------------------------------------------------------
bool SetVolumeValue( HMIXER hmixer, MIXERCONTROL *mxc, long volume)
{
MIXERCONTROLDETAILS mxcd;
MIXERCONTROLDETAILS_UNSIGNED vol;vol.dwValue = volume;
mxcd.hwndOwner = 0;
mxcd.dwControlID = mxc->dwControlID;
mxcd.cbStruct = sizeof(mxcd);
mxcd.cbDetails = sizeof(vol);
mxcd.paDetails = &vol;
mxcd.cChannels = 1;
if(mixerSetControlDetails((HMIXEROBJ)hmixer, &mxcd, MIXER_OBJECTF_HMIXER|MIXER_SETCONTROLDETAILSF_VALUE))
return 0;
return 1;
}
//---------------------------------------------------------------------------
unsigned WINAPI GetVolume(int dev)//得到设备的音量dev=0主音量，1WAVE ,2MIDI ,3 CD
{
long device;unsigned rt=0;
MIXERCONTROL volCtrl;
HMIXER hmixer;
switch (dev)
{
case 1:
device=MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT; break;
case 2:
device=MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER; break;
case 3:
device=MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC; break; // cd 音量
case 4:
device=MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE; break; //麦克风音量
case 5:
device=MIXERLINE_COMPONENTTYPE_SRC_LINE; break; //PC 扬声器音量
default:
device=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
}
if(mixerOpen(&hmixer, 0, 0, 0, 0)) return 0;
if(!GetVolumeControl(hmixer,device,MIXERCONTROL_CONTROLTYPE_VOLUME,&volCtrl))
return 0;
rt=GetVolumeValue(hmixer,&volCtrl)*100/volCtrl.Bounds.lMaximum;
mixerClose(hmixer);
return rt;
}
//---------------------------------------------------------------------------
bool WINAPI SetVolume( long dev, long vol)//设置设备的音量
{
// dev =0,1,2 分别表示主音量,波形,MIDI ,CD
// vol=0-100 表示音量的大小 , 设置与返回音量的值用的是百分比，即音量从0 - 100，而不是设备的绝对值
// retrun false 表示设置音量的大小的操作不成功
// retrun true 表示设置音量的大小的操作成功
long device;
bool rc=false;
MIXERCONTROL volCtrl;
HMIXER hmixer;
switch (dev)
{
case 1:
device=MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT; break;
case 2:
device=MIXERLINE_COMPONENTTYPE_SRC_SYNTHESIZER; break;
case 3:
device=MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC; break; // cd 音量
case 4:
device=MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE; break; //麦克风音量
case 5:
device=MIXERLINE_COMPONENTTYPE_SRC_LINE; break; //PC 扬声器音量
default:
device=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
}
if(mixerOpen(&hmixer, 0, 0, 0, 0)) return 0;
if(GetVolumeControl(hmixer,device,MIXERCONTROL_CONTROLTYPE_VOLUME,&volCtrl))
{
vol=vol*volCtrl.Bounds.lMaximum/100;
if(SetVolumeValue(hmixer,&volCtrl,vol))
rc=true;
}
mixerClose(hmixer);
return rc;
}
