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

最新推荐文章于 2023-03-03 11:59:11 发布

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xlm289348

最新推荐文章于 2023-03-03 11:59:11 发布

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分类专栏： Windows 编程 C++

本文链接：https://blog.youkuaiyun.com/xlm289348/article/details/8875251

这篇博客介绍了如何使用VC++编程控制Windows系统的音量，包括打开静音、增加音量和减少音量。针对XP系统和Win系统分别提供了不同的实现方式，涉及到的接口包括MMDeviceAPI和MMSYSTEM。程序中使用了CoInitialize、CoCreateInstance、IMMDeviceEnumerator、IAudioEndpointVolume等接口来实现音量的调节。

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#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);
       }
      }
     }