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Change Master Volume in Visual C++

, 29 Jul 2011 CPOL
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How to set/change the master volume.

To change volume in Vista and Windows 7, use this code:

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

bool ChangeVolume(double nVolume,bool bScalar)
{
 
    HRESULT hr=NULL;
    bool decibels = false;
    bool scalar = false;
    double newVolume=nVolume;
 
    CoInitialize(NULL);
    IMMDeviceEnumerator *deviceEnumerator = NULL;
    hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, 
                          __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);
    IMMDevice *defaultDevice = NULL;
 
    hr = deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);
    deviceEnumerator->Release();
    deviceEnumerator = NULL;
 
    IAudioEndpointVolume *endpointVolume = NULL;
    hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), 
         CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
    defaultDevice->Release();
    defaultDevice = NULL;
 
    // -------------------------
    float currentVolume = 0;
    endpointVolume->GetMasterVolumeLevel(&currentVolume);
    //printf("Current volume in dB is: %f\n", currentVolume);

    hr = endpointVolume->GetMasterVolumeLevelScalar(&currentVolume);
    //CString strCur=L"";
    //strCur.Format(L"%f",currentVolume);
    //AfxMessageBox(strCur);

    // printf("Current volume as a scalar is: %f\n", currentVolume);
    if (bScalar==false)
    {
        hr = endpointVolume->SetMasterVolumeLevel((float)newVolume, NULL);
    }
    else if (bScalar==true)
    {
        hr = endpointVolume->SetMasterVolumeLevelScalar((float)newVolume, NULL);
    }
    endpointVolume->Release();
 
    CoUninitialize();
 
    return FALSE;
}

The nVolume parameter must be between 0.0 and 1.0.

0.0 means mute and 1.0 means 100.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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GeneralMy vote of 1 Pin
LonWolve7-Aug-12 18:48
memberLonWolve7-Aug-12 18:48 

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