调节系统音量VC++(适合win和xp系统) 打开静音增减和减小系统音量

#include <mmdeviceapi.h>
#include <endpointvolume.h>
#include <mmsystem.h>
#pragma comment(lib, "winmm.lib")

以下程序为：如果系统处于静音状态则打开系统音量：

//Windows 系统音量设置

IMMDevice *device = NULL;

HRESULT hr = CoInitialize(NULL);
if (FAILED(hr))
{
return FALSE;
}

IMMDeviceEnumerator *deviceEnumerator = NULL;
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER,
__uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);

if (FAILED(hr))
{
// xp 系统调节音量
HMIXER hMixer;
MIXERLINE mixerline;
MIXERLINECONTROLS mlcs;
MIXERCONTROL mc;
MIXERCONTROLDETAILS_BOOLEAN mcdMute;
MIXERCONTROLDETAILS mcd;
LONG lvalue;
try{
   if (MMSYSERR_NOERROR == mixerOpen(&hMixer, 0, 0, 0, 0))
   {
    RtlZeroMemory(&mixerline, sizeof(MIXERLINE));
    mixerline.cbStruct = sizeof(MIXERLINE);
    mixerline.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
    if (MMSYSERR_NOERROR == mixerGetLineInfo((HMIXEROBJ)hMixer, &mixerline, MIXER_GETLINEINFOF_COMPONENTTYPE))
    {
     RtlZeroMemory(&mlcs, sizeof(MIXERLINECONTROLS));
     mlcs.cbStruct = sizeof(MIXERLINECONTROLS);
     mlcs.dwLineID = mixerline.dwLineID;
     mlcs.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
     mlcs.cControls = 1;
     mlcs.cbmxctrl = sizeof(MIXERCONTROL);
     mlcs.pamxctrl = & mc;
     if (MMSYSERR_NOERROR == mixerGetLineControls((HMIXEROBJ)hMixer, &mlcs, MIXER_GETLINECONTROLSF_ONEBYTYPE))
     {
      RtlZeroMemory(&mcd, sizeof(MIXERCONTROLDETAILS));
      mcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
      mcd.dwControlID = mc.dwControlID;
      mcd.cChannels = 1;
      mcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
      mcd.paDetails = &mcdMute;

      if (MMSYSERR_NOERROR == mixerGetControlDetails((HMIXEROBJ)hMixer, &mcd, MIXER_GETCONTROLDETAILSF_VALUE))
      {
       lvalue = mcdMute.fValue;
       if (lvalue != 0 )
       {
        RtlZeroMemory(&mcd, sizeof(MIXERCONTROLDETAILS));
        mcdMute.fValue = FALSE;       //静音设置，0非静音，1静音
        mcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
        mcd.dwControlID = mc.dwControlID;
        mcd.cChannels = 1;
        mcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
        mcd.paDetails = &mcdMute;
        mixerSetControlDetails((HMIXEROBJ)hMixer, &mcd, MIXER_SETCONTROLDETAILSF_VALUE);
       }
      }
     }
    }

    MIXERLINE mxl;
    MIXERCONTROL mxc;
    MIXERLINECONTROLS mxlc;
    MIXERCAPS m_mxcaps;

    mixerOpen(&hMixer,0,NULL,
     NULL,MIXER_OBJECTF_MIXER | CALLBACK_WINDOW);
    mixerGetDevCaps((UINT)hMixer, &m_mxcaps, sizeof(MIXERCAPS));
    mxl.cbStruct = sizeof(MIXERLINE);
    mxl.dwComponentType =MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;

mixerGetLineInfo((HMIXEROBJ)hMixer,&mxl,
MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_COMPONENTTYPE);

    mxlc.cbStruct = sizeof(mxlc); // 微软用此办法判断版本
    mxlc.dwLineID = mxl.dwLineID; // 上面取得的声卡音频输出线路标识
    // 控制类型为控制音量
    mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
    mxlc.cControls = 1;          // 使用 MIXERCONTROL 结构体变量个数
    mxlc.pamxctrl = &mxc;        // MIXERCONTROL 结构体变量指针
    mxlc.cbmxctrl = sizeof(mxc); // MIXERCONTROL 结构体变量字节大小

    // 取得控制器信息
    mixerGetLineControls((HMIXEROBJ)hMixer,
     &mxlc,
     MIXER_GETLINECONTROLSF_ONEBYTYPE);

    MIXERCONTROLDETAILS_UNSIGNED mxcdVolume;
    MIXERCONTROLDETAILS mxcd;
    mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
    mxcd.dwControlID = mxc.dwControlID;
    mxcd.cChannels = 1;
    mxcd.cMultipleItems = 0;
    mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED);
    mxcd.paDetails = &mxcdVolume;

mixerGetControlDetails((HMIXEROBJ)hMixer,&mxcd,
MIXER_OBJECTF_HMIXER|MIXER_GETCONTROLDETAILSF_VALUE);

    mxcdVolume.dwValue ;
    if (mxcdVolume.dwValue<6553)         // XP 系统如果打开后系统音量小于10% 则增加到10%
    {
     mxcdVolume.dwValue = 6553 ;
     mixerSetControlDetails((HMIXEROBJ)hMixer,&mxcd,
      MIXER_OBJECTF_HMIXER|MIXER_SETCONTROLDETAILSF_VALUE);
    }
   }
   mixerClose(hMixer);
   return FALSE;
}
catch(...)
{
   mixerClose(hMixer);
   return FALSE;
}
}
IMMDevice *defaultDevice = NULL;

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

IAudioEndpointVolume *endpointVolume;

hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, reinterpret_cast<void **>(&endpointVolume));
if (FAILED(hr))
{
return FALSE;
}

BOOL currentMute;
hr = endpointVolume->GetMute(¤tMute);
if (FAILED(hr))
{
return FALSE;
}
if (currentMute==TRUE)
{
hr = endpointVolume->SetMute(FALSE, NULL);
}

float currentVolume;
hr = endpointVolume->GetMasterVolumeLevelScalar(¤tVolume); //把主音量的水平标量
if (FAILED(hr))

补充：软件开发 , Vc ,

调节系统音量VC++(适合win和xp系统) 打开静音 增减和减小系统音量

调节系统音量VC++(适合win和xp系统) 打开静音增减和减小系统音量