How to control the system audio device such as volume and mute(Win API)

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I like to use WIN API towrite codes. :)
The following several functions can be used to control audio device.
The mixer- serial system functions must be invoked in your application. if you are familiar with these functions, you can find its so easy.

1.Initate the audio device to get its handle. mixerOpen function is used.

BOOLInitMixerDev(HMIXER*m_hMixer,HWNDhwnd)
{
//初始化声音控制
MIXERCAPSmxcaps;//混频器容量
ZeroMemory(&mxcaps,sizeof(MIXERCAPS));
if(mixerGetNumDevs()!=0)
{
if(mixerOpen(m_hMixer,0,(DWORD)hwnd,NULL,MIXER_OBJECTF_MIXER|CALLBACK_WINDOW)!=MMSYSERR_NOERROR)
returnFALSE;
//ThemixerGetDevCapsfunctionqueriesaspecifiedmixerdevicetodetermineitscapabilities
if(mixerGetDevCaps((UINT)*m_hMixer,&mxcaps,sizeof(MIXERCAPS))!=MMSYSERR_NOERROR)
returnFALSE;
}
if(*m_hMixer==NULL)
returnFALSE;
returnTRUE;
}




mixerGetLIneInfo function is to get channel number , control number and lineID.
mixerGetlineControls is to get control ID through channel and line ID.
mixerGetControlsDetails and mixerSetControlDetails are used to control audio device through control and control ID.

It iscareful to set MIXERCONTROL, MIXERCONTROLDETAILS struct.

BOOLGetVolume(HMIXERm_hMixer,DWORDdwSrcType,DWORD*pdwLValue,DWORD*pdwRValue,BOOLbMono=FALSE)
{
MIXERLINEmxl;//混频器线路数
mxl.cbStruct=sizeof(MIXERLINE);//必须初始化
mxl.dwComponentType=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,
MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_COMPONENTTYPE)!=MMSYSERR_NOERROR)
returnFALSE;

if(MIXERLINE_COMPONENTTYPE_DST_SPEAKERS!=dwSrcType)
{
DWORDnum=0,connections=mxl.cConnections;
DWORDtype=mxl.dwDestination;
do
{
mxl.cbStruct=sizeof(MIXERLINE);
mxl.dwDestination=type;
mxl.dwSource=num++;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,MIXER_GETLINEINFOF_SOURCE|MIXER_OBJECTF_HMIXER)!=MMSYSERR_NOERROR)
{
MessageBox(NULL,_T("GetLinInfoResourcefaile!"),_T("Error"),MB_OK);
returnFALSE;
}

}while(num<connections&&mxl.dwComponentType!=dwSrcType);
}


DWORDm_controlnum=mxl.cChannels;//声道数量

LPMIXERCONTROLpmxc;
DWORDcbmxctrl=sizeof(MIXERCONTROL)*mxl.cControls;
pmxc=(LPMIXERCONTROL)LocalAlloc(LPTR,cbmxctrl);
MIXERLINECONTROLSmxlc;
mxlc.cbStruct=sizeof(MIXERLINECONTROLS);
mxlc.dwLineID=mxl.dwLineID;
mxlc.dwControlType=MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls=mxl.cControls;
mxlc.cbmxctrl=cbmxctrl;
mxlc.pamxctrl=pmxc;
if(mixerGetLineControls((HMIXEROBJ)m_hMixer,
&mxlc,MIXER_OBJECTF_HMIXER|MIXER_GETLINECONTROLSF_ONEBYTYPE)!=MMSYSERR_NOERROR)
{
LocalFree(pmxc);
returnFALSE;
}
DWORDm_controlid=pmxc->dwControlID;
longm_min=pmxc->Bounds.lMinimum;
longm_max=pmxc->Bounds.lMaximum;
LocalFree(pmxc);

MIXERCONTROLDETAILS_SIGNEDmxcdVolume[2];
MIXERCONTROLDETAILSmxcd;
mxcd.cbStruct=sizeof(MIXERCONTROLDETAILS);
mxcd.dwControlID=m_controlid;
mxcd.cChannels=m_controlnum;
mxcd.cMultipleItems=0;
mxcd.cbDetails=sizeof(MIXERCONTROLDETAILS_SIGNED);
mxcd.paDetails=mxcdVolume;
if(mixerGetControlDetails((HMIXEROBJ)m_hMixer,
&mxcd,MIXER_OBJECTF_HMIXER|
MIXER_GETCONTROLDETAILSF_VALUE)!=MMSYSERR_NOERROR)
returnFALSE;
*pdwLValue=mxcdVolume[0].lValue;
if(m_controlnum==2)
{
*pdwRValue=mxcdVolume[1].lValue;
}
returnTRUE;
}


BOOLSetVolume(HMIXERm_hMixer,DWORDdwSrcType,DWORDdwLValue,DWORDdwRValue,BOOLbMono=FALSE)
{
MIXERLINEmxl;//混频器线路数
mxl.cbStruct=sizeof(MIXERLINE);//必须初始化
mxl.dwComponentType=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,
MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_COMPONENTTYPE)!=MMSYSERR_NOERROR)
returnFALSE;

if(MIXERLINE_COMPONENTTYPE_DST_SPEAKERS!=dwSrcType)
{
DWORDnum=0,connections=mxl.cConnections;
DWORDtype=mxl.dwDestination;
do
{
mxl.cbStruct=sizeof(MIXERLINE);
mxl.dwDestination=type;
mxl.dwSource=num++;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,MIXER_GETLINEINFOF_SOURCE|MIXER_OBJECTF_HMIXER)!=MMSYSERR_NOERROR)
{
MessageBox(NULL,_T("GetLinInfoResourcefaile!"),_T("Error"),MB_OK);
returnFALSE;
}

}while(num<connections&&mxl.dwComponentType!=dwSrcType);
}


DWORDm_controlnum=mxl.cChannels;//声道数量

LPMIXERCONTROLpmxc;
DWORDcbmxctrl=sizeof(MIXERCONTROL)*mxl.cControls;
pmxc=(LPMIXERCONTROL)LocalAlloc(LPTR,cbmxctrl);
MIXERLINECONTROLSmxlc;
mxlc.cbStruct=sizeof(MIXERLINECONTROLS);
mxlc.dwLineID=mxl.dwLineID;
mxlc.dwControlType=MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls=mxl.cControls;
mxlc.cbmxctrl=cbmxctrl;
mxlc.pamxctrl=pmxc;
if(mixerGetLineControls((HMIXEROBJ)m_hMixer,
&mxlc,MIXER_OBJECTF_HMIXER|MIXER_GETLINECONTROLSF_ONEBYTYPE)!=MMSYSERR_NOERROR)
{
LocalFree(pmxc);
returnFALSE;
}
DWORDm_controlid=pmxc->dwControlID;
longm_min=pmxc->Bounds.lMinimum;
longm_max=pmxc->Bounds.lMaximum;
LocalFree(pmxc);

MIXERCONTROLDETAILS_SIGNEDmxcdVolume[2];
MIXERCONTROLDETAILSmxcd;
mxcdVolume[0].lValue=dwLValue;
if(m_controlnum==2)
mxcdVolume[1].lValue=dwRValue;
mxcd.cbStruct=sizeof(MIXERCONTROLDETAILS);
mxcd.dwControlID=m_controlid;
mxcd.cChannels=2;
mxcd.cMultipleItems=0;
mxcd.cbDetails=sizeof(MIXERCONTROLDETAILS_SIGNED);
mxcd.paDetails=mxcdVolume;
if(mixerSetControlDetails((HMIXEROBJ)m_hMixer,
&mxcd,MIXER_OBJECTF_HMIXER|
MIXER_SETCONTROLDETAILSF_VALUE)!=MMSYSERR_NOERROR)
returnFALSE;

returnTRUE;
}


BOOLSetMute(HMIXERm_hMixer,DWORDdwSrcType,BOOLbValue)
{
MIXERLINEmxl;//混频器线路数
mxl.cbStruct=sizeof(MIXERLINE);//必须初始化
mxl.dwComponentType=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,
MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_COMPONENTTYPE)!=MMSYSERR_NOERROR)
returnFALSE;

if(MIXERLINE_COMPONENTTYPE_DST_SPEAKERS!=dwSrcType)
{
DWORDnum=0,connections=mxl.cConnections;
DWORDtype=mxl.dwDestination;
do
{
mxl.cbStruct=sizeof(MIXERLINE);
mxl.dwDestination=type;
mxl.dwSource=num++;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,MIXER_GETLINEINFOF_SOURCE|MIXER_OBJECTF_HMIXER)!=MMSYSERR_NOERROR)
{
MessageBox(NULL,_T("GetLinInfoResourcefaile!"),_T("Error"),MB_OK);
returnFALSE;
}

}while(num<connections&&mxl.dwComponentType!=dwSrcType);
}


DWORDm_Channelnum=mxl.cChannels;//声道数量

LPMIXERCONTROLpmxc;
DWORDcbmxctrl=sizeof(MIXERCONTROL)*mxl.cControls;
pmxc=(LPMIXERCONTROL)LocalAlloc(LPTR,cbmxctrl);
MIXERLINECONTROLSmxlc;
mxlc.cbStruct=sizeof(MIXERLINECONTROLS);
mxlc.dwLineID=mxl.dwLineID;
mxlc.dwControlType=MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls=mxl.cControls;
mxlc.cbmxctrl=cbmxctrl;
mxlc.pamxctrl=pmxc;
if(mixerGetLineControls((HMIXEROBJ)m_hMixer,
&mxlc,MIXER_OBJECTF_HMIXER|MIXER_GETLINECONTROLSF_ONEBYTYPE)!=MMSYSERR_NOERROR)
{
LocalFree(pmxc);
returnFALSE;
}

DWORDm_controlid=pmxc->dwControlID;
LocalFree(pmxc);


MIXERCONTROLDETAILS_BOOLEANmxcd_f;mxcd_f.fValue=bValue;
MIXERCONTROLDETAILSmxcd;
mxcd.cbStruct=sizeof(MIXERCONTROLDETAILS);
mxcd.dwControlID=m_controlid;
mxcd.cChannels=1;
mxcd.cMultipleItems=0;
mxcd.cbDetails=sizeof(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails=&mxcd_f;
if(mixerSetControlDetails((HMIXEROBJ)m_hMixer,
&mxcd,MIXER_OBJECTF_HMIXER|
MIXER_SETCONTROLDETAILSF_VALUE)!=MMSYSERR_NOERROR)
{

returnFALSE;
}

returnTRUE;
}






BOOLGetMute(HMIXERm_hMixer,DWORDdwSrcType,BOOL*PbValue)
{
MIXERLINEmxl;//混频器线路数
mxl.cbStruct=sizeof(MIXERLINE);//必须初始化
mxl.dwComponentType=MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,
MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_COMPONENTTYPE)!=MMSYSERR_NOERROR)
returnFALSE;

if(MIXERLINE_COMPONENTTYPE_DST_SPEAKERS!=dwSrcType)
{
DWORDnum=0,connections=mxl.cConnections;
DWORDtype=mxl.dwDestination;
do
{
mxl.cbStruct=sizeof(MIXERLINE);
mxl.dwDestination=type;
mxl.dwSource=num++;
if(mixerGetLineInfo((HMIXEROBJ)m_hMixer,&mxl,MIXER_GETLINEINFOF_SOURCE|MIXER_OBJECTF_HMIXER)!=MMSYSERR_NOERROR)
{
MessageBox(NULL,_T("GetLinInfoResourcefaile!"),_T("Error"),MB_OK);
returnFALSE;
}

}while(num<connections&&mxl.dwComponentType!=dwSrcType);
}


DWORDm_controlnum=mxl.cChannels;//声道数量

LPMIXERCONTROLpmxc;
DWORDcbmxctrl=sizeof(MIXERCONTROL)*mxl.cControls;
pmxc=(LPMIXERCONTROL)LocalAlloc(LPTR,cbmxctrl);
MIXERLINECONTROLSmxlc;
mxlc.cbStruct=sizeof(MIXERLINECONTROLS);
mxlc.dwLineID=mxl.dwLineID;
mxlc.dwControlType=MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls=mxl.cControls;
mxlc.cbmxctrl=cbmxctrl;
mxlc.pamxctrl=pmxc;
if(mixerGetLineControls((HMIXEROBJ)m_hMixer,
&mxlc,MIXER_OBJECTF_HMIXER|MIXER_GETLINECONTROLSF_ONEBYTYPE)!=MMSYSERR_NOERROR)
{
LocalFree(pmxc);
returnFALSE;
}
DWORDm_controlid=pmxc->dwControlID;
LocalFree(pmxc);

MIXERCONTROLDETAILS_BOOLEANmxcd_f;

MIXERCONTROLDETAILSmxcd;
mxcd.cbStruct=sizeof(MIXERCONTROLDETAILS);
mxcd.dwControlID=m_controlid;
mxcd.cChannels=m_controlnum;
mxcd.cMultipleItems=0;
mxcd.cbDetails=sizeof(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails=&mxcd_f;
if(mixerGetControlDetails((HMIXEROBJ)m_hMixer,
&mxcd,MIXER_OBJECTF_HMIXER|
MIXER_GETCONTROLDETAILSF_VALUE)!=MMSYSERR_NOERROR)
returnFALSE;
*PbValue=mxcd_f.fValue;
returnTRUE;
}
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