It was necessary to programmatically switch the audio output device by default. For example, the system has several audio devices installed - Speakers, Realtek HD Audio 2nd output, Realtek Digital Output, nVidia HDMI Output (Port 1), nVidia HDMI Output (Port 3), nVidia HDMI Output (Port 3) .

It is necessary to programmatically make the user-selected device the default device in the system.

Google, but did not find a working solution, except for WinXP.

Tried to use the following code found in the open spaces:

uses MMSystem; const DRVM_MAPPER = $2000; DRVM_MAPPER_PREFERRED_GET = DRVM_MAPPER+21; DRVM_MAPPER_PREFERRED_SET = DRVM_MAPPER+22; .... function ChangePrimarySndOutDevice(dev: cardinal): integer; begin result := waveOutMessage(HWAVEOUT(WAVE_MAPPER), DRVM_MAPPER_PREFERRED_SET, dev, 0); end;

I also saw that you need to transfer the current and new devices to the waveOutMessage function, so I tried this option:

 function ChangePrimarySndOutDevice2(olddev, newdev: cardinal): integer; begin result := waveOutMessage(HWAVEOUT(WAVE_MAPPER), DRVM_MAPPER_PREFERRED_SET, olddev, newdev); end;

Unfortunately, it did not work out.

I do not need to play the sound, I just would like to install in the system (Windows 7+) the default playback device that the user chose as if he did it through the Control Panel , the Sound snap-in.

    1 answer 1

    Look here: Programmatically (or Command Line) change the default sound playback device in Windows 7

    This is an undocumented version. But judging by the extensive discussion on this issue, this type of task ms does not want to solve legally: Programatically setting the default playback device (and recording device) .

    And it seems that this is a conscious decision, i.e. They have such a policy: do not touch the options that the user specified.

    • Thank you, quite exhaustively! - BlackWitcher