[DLL] Mute sounds on Vista

[Paul M]

Here is the brilliant code to the frustrating issue with muting sounds on vista due to everything changing. This was made with some help from Rob Paveza (http://geekswithblogs.net/robp). As you can see the functions exported are simply MuteAudio() and UnmuteAudio().

AudioControl.cpp code
#include "common.h"

BOOL MuteAudio()
{
HRESULT hr;
CoInitialize(NULL);
IMMDeviceEnumerator *deviceEnumerator = NULL;
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);
if (!SUCCEEDED(hr))
{
CoUninitialize();
return FALSE;
}

IMMDevice *defaultDevice = NULL;

hr = deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);
deviceEnumerator->Release();
deviceEnumerator = NULL;
if (!SUCCEEDED(hr))
{
CoUninitialize();
return FALSE;
}

IAudioEndpointVolume *endpointVolume = NULL;
hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
defaultDevice->Release();
defaultDevice = NULL;

if (!SUCCEEDED(hr))
{
CoUninitialize();
return FALSE;
}

// -------------------------

endpointVolume->SetMute(TRUE, NULL);

endpointVolume->Release();

CoUninitialize();

return TRUE;
}

BOOL UnmuteAudio()
{
HRESULT hr;

CoInitialize(NULL);
IMMDeviceEnumerator *deviceEnumerator = NULL;
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);
if (!SUCCEEDED(hr))
{
CoUninitialize();
return FALSE;
}

IMMDevice *defaultDevice = NULL;

hr = deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);
deviceEnumerator->Release();
deviceEnumerator = NULL;
if (!SUCCEEDED(hr))
{
CoUninitialize();
return FALSE;
}

IAudioEndpointVolume *endpointVolume = NULL;
hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
defaultDevice->Release();
defaultDevice = NULL;

if (!SUCCEEDED(hr))
{
CoUninitialize();
return FALSE;
}

// -------------------------

endpointVolume->SetMute(FALSE, NULL);

endpointVolume->Release();

CoUninitialize();

return TRUE;
}

common.h code
#pragma once

#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <objbase.h>
#include <mmdeviceapi.h>
#include <endpointvolume.h>

#define AUDCTRL_API extern "C" __declspec(dllexport)

AUDCTRL_API BOOL MuteAudio(void);
AUDCTRL_API BOOL UnmuteAudio(void);

[deepu8]

wow, that is really interesting thanks for sharing it.