编程调节Win7/Win8系统音量的一种方法

不得不说, 自Win7(好像是吧), Windows的音量调节功能比以前更人性化了....
     但编程接口却变得更加复杂了............. 还要用到IAudioEndpointVolume………….

下面的代码是我整理的, 经测试可用, 嫌麻烦的可以直接拿来用, 接口很简单, 因而只能整个系统的音量...

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

//参数:
//    -2 恢复静音
//    -1 静音
//    0~100:音量比例
bool SetVolumeLevel(int level)
{
    HRESULT hr;
    IMMDeviceEnumerator* pDeviceEnumerator=;
    IMMDevice* pDevice=;
    IAudioEndpointVolume* pAudioEndpointVolume=;
    IAudioClient* pAudioClient=;

    try{
        hr = CoCreateInstance(__uuidof(MMDeviceEnumerator),NULL,CLSCTX_ALL,__uuidof(IMMDeviceEnumerator),(void**)&pDeviceEnumerator);
        if(FAILED(hr)) throw "CoCreateInstance";
        hr = pDeviceEnumerator->GetDefaultAudioEndpoint(eRender,eMultimedia,&pDevice);
        if(FAILED(hr)) throw "GetDefaultAudioEndpoint";
        hr = pDevice->Activate(__uuidof(IAudioEndpointVolume),CLSCTX_ALL,NULL,(void**)&pAudioEndpointVolume);
        if(FAILED(hr)) throw "pDevice->Active";
        hr = pDevice->Activate(__uuidof(IAudioClient),CLSCTX_ALL,NULL,(void**)&pAudioClient);
        if(FAILED(hr)) throw "pDevice->Active";

        if(level==-){
            hr = pAudioEndpointVolume->SetMute(FALSE,NULL);
            if(FAILED(hr)) throw "SetMute";
        }else if(level==-){
            hr = pAudioEndpointVolume->SetMute(TRUE,NULL);
            if(FAILED(hr)) throw "SetMute";
        }else{
            if(level< || level>){
                hr = E_INVALIDARG;
                throw "Invalid Arg";
            }

            float fVolume;
            fVolume = level/100.0f;
            hr = pAudioEndpointVolume->SetMasterVolumeLevelScalar(fVolume,&GUID_NULL);
            if(FAILED(hr)) throw "SetMasterVolumeLevelScalar";

            pAudioClient->Release();
            pAudioEndpointVolume->Release();
            pDevice->Release();
            pDeviceEnumerator->Release();
            return true;
        }
    }
    catch(...){
        if(pAudioClient) pAudioClient->Release();
        if(pAudioEndpointVolume) pAudioEndpointVolume->Release();
        if(pDevice) pDevice->Release();
        if(pDeviceEnumerator) pDeviceEnumerator->Release();
        throw;
    }
    return false;
}

int main()
{
    CoInitialize();
    try{
        //3秒后静音
        Sleep();
        SetVolumeLevel(-);
        //3秒后恢复静音
        Sleep();
        SetVolumeLevel(-);
        //调节音量
        Sleep();
        SetVolumeLevel();
        Sleep();
        SetVolumeLevel();
        Sleep();
        SetVolumeLevel();
    }
    catch(...){
        //错误处理...
    }
    CoUninitialize();
    return ;
}

下载:http://share.weiyun.com/19003dc8fd0804aaf1fc03b2430e832e

参考:
              IAudioEndpointVolume interface

Win7/Vista Audio API Master Volume Control

女孩不哭 @ cnblogs.com/memset @ 2014-04-07