change volume win32 c++

Question

How would I go about changing the sound volume in c++ win32? Also how would I mute/unmute it? Thanks for the help!

WASAPI(Windows Audio Session API) would be of great use when it comes to controlling audio streams with Win32 C++. This is the link to the official documentation of the API: https://learn.microsoft.com/en-us/windows/win32/api/_coreaudio/ — Tech Trivia, Mar 28 '20 at 17:20
Maybe you should consider to NOT change the global volume. Think about it - if I lower the volume in MediaPlayer all other programs are still as loud as before, and that is exactly what I expect from any program - to only lower it's OWN volume. Of course there might be reasons to change global volume, no offense ;) — qwerty, Mar 31 '09 at 06:42

Irwin · Answer 1 · 2009-03-31T00:47:53.063

14

Use the waveOutSetVolume API.

Here's an example:

  DWORD dwVolume;

  if (waveOutGetVolume(NULL, &dwVolume) == MMSYSERR_NOERROR)
    waveOutSetVolume(NULL, 0); // mute volume

  // later point in code, to unmute volume...
  waveOutSetVolume(NULL, dwVolume);

edited Mar 31 '09 at 00:47

answered Mar 31 '09 at 00:42

Irwin

499
1
3
12

4

This sets the volume to zero, which is not the same as muting (although the effect is very similar). And it sets the “Wave” volume, not “Master Volume”. Which may or may not be what you want. – svick Oct 14 '11 at 10:44
Why are you passing NULL to the function? – 2501 Sep 20 '16 at 20:56
Unfortunately, the waveOutGetVolume only valid for Windows below Vista. Mean, it is no more work for Vista or above. – AirCraft Lover Jul 05 '22 at 05:47

score 9 · Answer 2 · answered Apr 04 '09 at 07:17

9

waveOutSetVolume and mixerSetControlDetails only change the volume for your application on Windows Vista and above.

If you want to change the master volume on Vista and beyond, search for the IAudioEndpointVolume interface.

Here's a blog post I wrote on this a couple of years ago.

answered Apr 04 '09 at 07:17

Larry Osterman

16,086
32
60

To me "above" and "beyond" sounds almost the same when speaking about versions. Could you clarify please. – sharkin Apr 04 '09 at 07:25
They ARE the same. My point is that starting with Windows Vista and continuing for all subsequent versions of Windows (including Windows 7 and all subsequently released versions) the mixer and wave volumes are per- application and not global. For Vista and beyond use IAudioEndpointVolume. – Larry Osterman Apr 04 '09 at 17:41

score 2 · Accepted Answer · edited May 23 '17 at 11:45

2

Two options:

There's an answer to that question here on SO (changing the master volume from C++, which also includes SetMute, etc.)
Have you considered showing the Volume controls and letting the user? If so, I can post some code for that. (You basically just shell out to the volume control applet.

edited May 23 '17 at 11:45

Community

1
1

answered Mar 31 '09 at 00:40

Clay Nichols

11,848
30
109
170

score 1 · Answer 4 · answered Jun 19 '14 at 17:33

1

If all you want to do is change the volume then you can use the virtual key codes to change volume like this:

void changeVolume()
{
  INPUT ip={0};
  ip.type = INPUT_KEYBOARD;
  ip.ki.wVk = VK_VOLUME_UP;   //or VOLUME_DOWN or MUTE
  SendInput(1, &ip, sizeof(INPUT));
  ip.ki.dwFlags = KEYEVENTF_KEYUP;
  SendInput(1, &ip, sizeof(INPUT));
}

answered Jun 19 '14 at 17:33

mchouhan_google

1,775
1
20
28

1

Simulating key strokes for utility tasks is never a good idea. – GrayFace Jun 20 '14 at 17:57
My request is to toggle the volume, like 30% to 100% or reverse. – Zhang Jan 27 '20 at 03:56

score 0 · Answer 5 · edited May 23 '17 at 11:45

Simplest way to toggle mute is

const int APPCOMMAND_VOLUME_MUTE = 0x80000;
SendMessage(this.Handle, WM_APPCOMMAND, IntPtr.Zero, (IntPtr)APPCOMMAND_VOLUME_MUTE);

In similar way you can trigger +Volume and -Volume keys behavior. Take a look at http://www.blackwasp.co.uk/BasicVolumeControl.aspx and http://msdn.microsoft.com/en-us/library/windows/desktop/ms646247%28v=vs.85%29.aspx

There are also values for things like microphone volume control, but I haven't tried them.

If you need more control over system master volume, you must check Windows version and do 2 versions of code:
Something like aforementioned Changing master volume level for Win XP.
Something like https://stackoverflow.com/a/3437069/1365066 for Vista and higher.

change volume win32 c++

5 Answers5

Linked