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!

Solution 1

Two options:

1. There's an answer to that question here on SO (changing the master volume from C++, which also includes SetMute, etc.)

2. 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.

Solution 2

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);

Solution 3

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.

Solution 4

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));
}

View more solutions

Comments

[sharkin]

To me "above" and "beyond" sounds almost the same when speaking about versions. Could you clarify please.

[Larry Osterman]

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.

[svick]

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.

[GrayFace]

Simulating key strokes for utility tasks is never a good idea.

[2501]

Why are you passing NULL to the function?

[Zhang]

My request is to toggle the volume, like 30% to 100% or reverse.