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Mute windows

Apr 23, 2009 at 7:34am
xinsikuangchao (3)
How to mute windows system(win32)?
Apr 23, 2009 at 8:40am
writetonsharma (1461)
disconnect the speakers... :D
Apr 23, 2009 at 8:52am
closed account (z05DSL3A)
This may be of help:
Endpoint Volume Controls
http://msdn.microsoft.com/en-us/library/dd370839(VS.85).aspx
Apr 23, 2009 at 9:20am
xinsikuangchao (3)
Endpoint Volume Controls requests Windows vista... I'm working on xp...
Apr 23, 2009 at 10:45am
closed account (z05DSL3A)
In that case you could look at manipulating the audio mixer, IIRC mixerSetControlDetails allows you to set the mute state on the mixer. MSDN should have all the details...

Edit:
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#include <iostream>
#include <windows.h>

#pragma comment(lib,"Winmm")

class Mixer
{
public:
    /*************************************************************************/
    bool init()
    {
        _nNumMixers = mixerGetNumDevs();
        _hMixer = NULL;
        ZeroMemory(&_mxcaps, sizeof(MIXERCAPS));

        if(_nNumMixers != 0) 
        {
            if (mixerOpen(&_hMixer, 0, 0, NULL, MIXER_OBJECTF_MIXER) != MMSYSERR_NOERROR) 
            {
                return FALSE;
            }

            if (mixerGetDevCaps((UINT)_hMixer, &_mxcaps, sizeof(MIXERCAPS)) != MMSYSERR_NOERROR) 
            {
                return FALSE;
            }
        }

        return _hMixer != NULL;
    }

    /*************************************************************************/
    bool close()
    {
        return mixerClose(_hMixer) == MMSYSERR_NOERROR;
    }

    /*************************************************************************/
    bool GetMuteControl() 
    {
        MIXERLINE mixerLine;
        mixerLine.cbStruct = sizeof(MIXERLINE);
        mixerLine.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;

        if (mixerGetLineInfo((HMIXEROBJ)_hMixer,
                             &mixerLine,
                             MIXER_OBJECTF_HMIXER |
                             MIXER_GETLINEINFOF_COMPONENTTYPE) != MMSYSERR_NOERROR) 
        {
            return FALSE;
        }

        MIXERCONTROL mixerControl;
        MIXERLINECONTROLS mixerLineControl;

        mixerLineControl.cbStruct         = sizeof(MIXERLINECONTROLS);
        mixerLineControl.dwLineID         = mixerLine.dwLineID;
        mixerLineControl.dwControlType    = MIXERCONTROL_CONTROLTYPE_MUTE;
        mixerLineControl.cControls        = 1;
        mixerLineControl.cbmxctrl         = sizeof(MIXERCONTROL);
        mixerLineControl.pamxctrl         = &mixerControl;

        if (mixerGetLineControls((HMIXEROBJ)_hMixer,
                                 &mixerLineControl,
                                 MIXER_OBJECTF_HMIXER |
                                 MIXER_GETLINECONTROLSF_ONEBYTYPE) != MMSYSERR_NOERROR) 
        {
            return FALSE;
        }

        _controlID = mixerControl.dwControlID;

        return TRUE;
    }

    /*************************************************************************/
    bool GetMuteValue(LONG* value) 
    {

        MIXERCONTROLDETAILS_BOOLEAN mxcdMute;
        MIXERCONTROLDETAILS mixerControlDetails;

        mixerControlDetails.cbStruct          = sizeof(MIXERCONTROLDETAILS);
        mixerControlDetails.dwControlID       = _controlID;
        mixerControlDetails.cChannels         = 1;
        mixerControlDetails.cMultipleItems    = 0;
        mixerControlDetails.cbDetails         = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
        mixerControlDetails.paDetails         = &mxcdMute;

        if (mixerGetControlDetails((HMIXEROBJ)_hMixer,
                                     &mixerControlDetails,
                                     MIXER_OBJECTF_HMIXER
                                     | MIXER_GETCONTROLDETAILSF_VALUE) != MMSYSERR_NOERROR)
        {
            return FALSE;
        }

        *value = mxcdMute.fValue;
        return TRUE;
    }

    /*************************************************************************/
    bool SetMute( bool state) 
    {

        MIXERCONTROLDETAILS_BOOLEAN mxcdMute = { (LONG) state };
        MIXERCONTROLDETAILS mixerControlDetails;

        mixerControlDetails.cbStruct        = sizeof(MIXERCONTROLDETAILS);
        mixerControlDetails.dwControlID     = _controlID;
        mixerControlDetails.cChannels       = 1;
        mixerControlDetails.cMultipleItems  = 0;
        mixerControlDetails.cbDetails       = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
        mixerControlDetails.paDetails       = &mxcdMute;

        if (mixerSetControlDetails((HMIXEROBJ)_hMixer,
                                     &mixerControlDetails,
                                     MIXER_OBJECTF_HMIXER
                                     | MIXER_SETCONTROLDETAILSF_VALUE) != MMSYSERR_NOERROR) 
        {
            return FALSE;
        }
        return TRUE;
    }

private:
    /*************************************************************************/
    UINT _nNumMixers;
    HMIXER _hMixer;
    MIXERCAPS _mxcaps;
    DWORD _controlID;
};

/*****************************************************************************\
\*****************************************************************************/
int main(int argc, char* argv[]) 
{
    Mixer mixer;

    if( mixer.init() && mixer.GetMuteControl() )
    {
        LONG currValue;
        mixer.GetMuteValue(&currValue);
        std::cout << "Mute state:" <<  currValue << std::endl;

        mixer.SetMute(true);
        mixer.GetMuteValue(&currValue);
        std::cout << "Mute state:" <<  currValue << std::endl;

        mixer.SetMute(false);
        mixer.GetMuteValue(&currValue);
        std::cout << "Mute state:" <<  currValue << std::endl;
        
        mixer.close();
    }

  return 0;
}
Edit & run on cpp.sh
Last edited on Apr 23, 2009 at 12:11pm
Apr 29, 2009 at 2:32am
xinsikuangchao (3)
Thanks a lot, Grey Wolf. It works!
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