dectect麦克风＃39;的音量

他，任何人都可以教我如何来解答complie时，我有仍然得到错误和其他链接错误的问题。
和我是一个编程初学者

在提前{S0的}感谢{S0的}

#include < windows.h >

#include < mmsystem.h >

#include < iostream >

#pragma comment (lib,"winmm.lib")

using namespace std;

 

int DeviceManager::getAudioInputVolumn( const std::string &deviceName )

{

 MMRESULT          rc;     

 HMIXER            hMixer; 

 MIXERLINE         mxl;    

 MIXERLINECONTROLS mxlc;   

 MIXERCONTROL      mxc;    

 

 for( int deviceID =0 ; true ; deviceID++ )

 {

   rc = mixerOpen(&hMixer,deviceID,0,0,MIXER_OBJECTF_MIXER);

 

  if( MMSYSERR_NOERROR!=rc )

  {

   break;

  }

 

  ZeroMemory(&mxl, sizeof(MIXERLINE));

 

  mxl.cbStruct = sizeof(MIXERLINE); 

  mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN;

 

  rc = mixerGetLineInfo((HMIXEROBJ)hMixer,

   &mxl,MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_COMPONENTTYPE);

  if( rc!=MMSYSERR_NOERROR )

  {

   continue;

  }

 

 

  DWORD   dwConnections   =   mxl.cConnections; 

  DWORD   dwLineID = -1; 

  for( DWORD i=0 ; i<dwconnections;>  { 

   mxl.dwSource = i;

   rc = mixerGetLineInfo((HMIXEROBJ)hMixer,&mxl,MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_SOURCE);

 

   if( MMSYSERR_NOERROR==rc )

   {  

    if( mxl.dwComponentType==MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE )

    { 

     dwLineID = mxl.dwLineID; 

     break; 

    }

   }

  } 

  if( dwLineID==-1 )

  { 

   continue;

  }

 

  ZeroMemory(&mxc, sizeof(MIXERCONTROL));

 

  mxc.cbStruct = sizeof(mxc); 

 

  ZeroMemory(&mxlc, sizeof(MIXERLINECONTROLS));

 

  mxlc.cbStruct = sizeof(mxlc); 

  mxlc.dwLineID = dwLineID; 

  mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;

  mxlc.cControls = 1;          

  mxlc.pamxctrl = &mxc;       

  mxlc.cbmxctrl = sizeof(mxc);

 

  rc = mixerGetLineControls((HMIXEROBJ)hMixer,&mxlc,MIXER_GETLINECONTROLSF_ONEBYTYPE);

 

  if (MMSYSERR_NOERROR == rc)

  {

   MIXERCONTROLDETAILS        mxcd;      

   MIXERCONTROLDETAILS_SIGNED volStruct; 

 

   ZeroMemory(&mxcd, sizeof(mxcd));

 

   mxcd.cbStruct = sizeof(mxcd);       

   mxcd.dwControlID = mxc.dwControlID; 

   mxcd.paDetails = &volStruct;        

   mxcd.cbDetails = sizeof(volStruct); 

   mxcd.cChannels = 1;                 

 

   rc = mixerGetControlDetails((HMIXEROBJ)hMixer,&mxcd,MIXER_GETCONTROLDETAILSF_VALUE);

 

   if (MMSYSERR_NOERROR == rc)

   {

    long step = ( mxc.Bounds.lMaximum - mxc.Bounds.lMinimum ) /100;

 

    int index = ( volStruct.lValue - mxc.Bounds.lMinimum) /step ;

    printf("volume:%X", volStruct.lValue);

    return index;

   }

  }

 }

 

 return -1;

}