dectect microphone's volume

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He,can anyone teach me how to sovle the problem which when i complie, there are still get 2 error and other link error.
And i am a programming beginner

Thanks in advance:):)

C++

#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;
}

Posted 9-Oct-11 21:49pm

lijing123456

Updated 10-Oct-11 0:08am

DaveAuld

v2

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Comments

André Kraak 10-Oct-11 6:17am

I might be useful if you mentioned the error messages you are getting and specify which lines are generating the errors.

If you wish to change your question use the Improve Question button.

3 solutions

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enhzflep · Answer 1 · 2011-10-10T01:18:00

Solution 1

1.
Add #include <stdio.h> to the top of the file

2.
Change

C++

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

to

int getAudioInputVolumn( const std::string &deviceName )

3.
Change

C++

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

to

for( DWORD i=0 ; i<dwConnections; )

It will now compile, though won't link because the program has no entry point.

4.
Add either a main or a winMain function to the code.

Posted 10-Oct-11 1:18am

enhzflep

Updated 10-Oct-11 1:20am

v2

Comments

lijing123456 12-Oct-11 3:09am

Hi, sorry for disturbing you,
I just follow your instructions, now it can comile successful but when I click Debug, the window will be closed immediately without displaying anything.
thanks in advance :)

and after your instructions, I chang my code like that:

#include < stdio.h >
#include < windows.h >
#include < mmsystem.h >
#include < iostream >
#pragma comment (lib,"winmm.lib")
using namespace std;

int main()
{
}

int 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

lijing123456 · Answer 2 · 2011-10-11T21:11:00

Hi, sorry for disturbing you,
I just follow your instructions, now it can comile successful but when I click Debug, the window will be closed immediately without displaying anything.
thanks in advance :)
and after your instructions, I chang my code like that:

#include < stdio.h >
#include < windows.h >
#include < mmsystem.h >
#include < iostream >
#pragma comment (lib,"winmm.lib")
using namespace std;

int main()
{
}

int 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;
}

enhzflep · Answer 3 · 2011-10-18T16:07:00

A true horror, however it does produce an accurate output..

#include <windows.h>
#include <mmsystem.h>
#include <iostream>

// EDITED s.b
#include <stdio.h>

using namespace std;

// CHANGED s.b int DeviceManager::getAudioInputVolumn( const std::string &deviceName)
int getAudioInputVolumn()
{
    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;
// EDITED s.b  for( DWORD i=0 ; i<dwconnections;>  {
        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;
}

int main()
{
    printf("Mic volume: %d\n", getAudioInputVolumn());
}

dectect microphone's volume

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