C / C++ / MFC

class CMute
{
public:
	UINT m_nNumMixers;
	HMIXER m_hMixer;
	MIXERCAPS m_mxcaps;

	DWORD m_dwMuteControlID;

	BOOL amdUninitialize();
	BOOL amdInitialize();
	BOOL amdGetMasterMuteControl();
	BOOL amdGetMasterMuteValue(LONG &lVal) const;
	BOOL amdSetMasterMuteValue(LONG lVal) const;
};

BOOL CMute::amdInitialize()
{
	ASSERT(m_hMixer == NULL);

	// get the number of mixer devices present in the system
	m_nNumMixers = ::mixerGetNumDevs();

	m_hMixer = NULL;
	::ZeroMemory(&m_mxcaps, sizeof(MIXERCAPS));

	m_dwMuteControlID = 0;

	// open the first mixer
	// A "mapper" for audio mixer devices does not currently exist.
	if (m_nNumMixers != 0)
	{
		if (::mixerOpen(&m_hMixer,
						0,
						reinterpret_cast<DWORD>(this->GetSafeHwnd()),
						NULL,
						MIXER_OBJECTF_MIXER | CALLBACK_WINDOW)
			!= MMSYSERR_NOERROR)
		{
			return FALSE;
		}

		if (::mixerGetDevCaps(reinterpret_cast<UINT>(m_hMixer),
							  &m_mxcaps, sizeof(MIXERCAPS))
			!= MMSYSERR_NOERROR)
		{
			return FALSE;
		}
	}

	return TRUE;
}

BOOL CMute::amdUninitialize()
{
	BOOL bSucc = TRUE;

	if (m_hMixer != NULL)
	{
		bSucc = (::mixerClose(m_hMixer) == MMSYSERR_NOERROR);
		m_hMixer = NULL;
	}

	return bSucc;
}

BOOL CMute::amdGetMasterMuteControl()
{
	if (m_hMixer == NULL)
	{
		return FALSE;
	}

	// get dwLineID
	MIXERLINE mxl;
	mxl.cbStruct = sizeof(MIXERLINE);
	mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
	if (::mixerGetLineInfo(reinterpret_cast<HMIXEROBJ>(m_hMixer),
						   &mxl,
						   MIXER_OBJECTF_HMIXER |
						   MIXER_GETLINEINFOF_COMPONENTTYPE)
		!= MMSYSERR_NOERROR)
	{
		return FALSE;
	}

	// get dwControlID
	MIXERCONTROL mxc;
	MIXERLINECONTROLS mxlc;
	mxlc.cbStruct = sizeof(MIXERLINECONTROLS);
	mxlc.dwLineID = mxl.dwLineID;
	mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
	mxlc.cControls = 1;
	mxlc.cbmxctrl = sizeof(MIXERCONTROL);
	mxlc.pamxctrl = &mxc;
	if (::mixerGetLineControls(reinterpret_cast<HMIXEROBJ>(m_hMixer),
							   &mxlc,
							   MIXER_OBJECTF_HMIXER |
							   MIXER_GETLINECONTROLSF_ONEBYTYPE)
		!= MMSYSERR_NOERROR)
	{
		return FALSE;
	}

	m_dwMuteControlID = mxc.dwControlID;

	return TRUE;
}

BOOL CMute::amdGetMasterMuteValue(LONG &lVal) const
{
	if (m_hMixer == NULL)
	{
		return FALSE;
	}

	MIXERCONTROLDETAILS_BOOLEAN mxcdMute;
	MIXERCONTROLDETAILS mxcd;
	mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
	mxcd.dwControlID = m_dwMuteControlID;
	mxcd.cChannels = 1;
	mxcd.cMultipleItems = 0;
	mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
	mxcd.paDetails = &mxcdMute;
	if (::mixerGetControlDetails(reinterpret_cast<HMIXEROBJ>(m_hMixer),
								 &mxcd,
								 MIXER_OBJECTF_HMIXER |
								 MIXER_GETCONTROLDETAILSF_VALUE)
		!= MMSYSERR_NOERROR)
	{
		return FALSE;
	}
	
	lVal = mxcdMute.fValue;

	return TRUE;
}

BOOL CMute::amdSetMasterMuteValue(LONG lVal) const
{
	if (m_hMixer == NULL)
	{
		return FALSE;
	}

	MIXERCONTROLDETAILS_BOOLEAN mxcdMute = { lVal };
	MIXERCONTROLDETAILS mxcd;
	mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
	mxcd.dwControlID = m_dwMuteControlID;
	mxcd.cChannels = 1;
	mxcd.cMultipleItems = 0;
	mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
	mxcd.paDetails = &mxcdMute;
	if (::mixerSetControlDetails(reinterpret_cast<HMIXEROBJ>(m_hMixer),
								 &mxcd,
								 MIXER_OBJECTF_HMIXER |
								 MIXER_SETCONTROLDETAILSF_VALUE)
		!= MMSYSERR_NOERROR)
	{
		return FALSE;
	}
	
	return TRUE;
}

markhaslehurst wrote:

What are all the '::'?!

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

markhaslehurst wrote:

...is MFC basically the same...

markhaslehurst wrote:

Do you know how to mute it (other than setting the volume to 0) - as in, similar to checking the 'mute all' option in windows?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

VuNic wrote:

...didn't you notice the topic changing to "OT"...

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

DavidCrow wrote:

Of course I noticed that. I'm not blind.