MessageBeep not playing any sound

Question

I'm trying to use the MessageBeep API to play a sound, but no sound plays.

MessageBeep(MB_ICONINFORMATION);
MessageBeep(MB_ICONASTERISK);
MessageBeep(MB_ICONEXCLAMATION);
MessageBeep(MB_ICONERROR);
MessageBeep(MB_ICONHAND);
MessageBeep(MB_ICONINFORMATION);
MessageBeep(MB_ICONQUESTION);
MessageBeep(MB_ICONSTOP);
MessageBeep(MB_ICONWARNING);
MessageBeep(MB_OK);

• Yes have speakers plugged in
• Yes the volume is turned up
• Yes i hear other MessageBeeps (UAC, Default, Error, etc)
• Yes i hear audio from other application ( what i'm listing to right now is irocnical )
• Windows 10.0.14393 64-bit
• Interactively connected (ie not through terminal services remote desktop session)

• the function (which returns a BOOL ) returns true

  

• Yes there is a "Default" sound set in the Sounds applet of the Control Panel

  

• The Beep service is started (although the Beep function is not relevant here)

• Applications are not allowed to take exclusive control of my default (and only) sound device:

  

• Windows does not attempt to play any sound; you can see no "output levels" in the Volume Mixer:

  

What am I missing?

Sample code to reproduce the problem

procedure TForm4.Button1Click(Sender: TObject);
begin
    MessageBox(0, 'About to play sounds', 'TestApp', MB_OK);

     MessageBeep(MB_ICONINFORMATION);
     MessageBeep(MB_ICONASTERISK);
     MessageBeep(MB_ICONEXCLAMATION);
     MessageBeep(MB_ICONERROR);
     MessageBeep(MB_ICONHAND);
     MessageBeep(MB_ICONINFORMATION);
     MessageBeep(MB_ICONQUESTION);
     MessageBeep(MB_ICONSTOP);
     MessageBeep(MB_ICONWARNING);
     MessageBeep(MB_OK);
     MessageBeep($ffffffff);
    MessageBox(0, 'After playing sounds', 'TestApp', MB_OK);
end;

Tested on:

• Windows 10 64-bit
• Windows 7 64-bit

• Windows 7 64-bit

• Delphi 5

  

• Delphi 7

  

• Delphi XE6

  

See Also

• MSDN Forums: No sound from MessageBeep() ( archive )

Bonus Reading

• Larry Osterman: What's up with the Beep driver in Windows 7?

  The Windows Beep function was re-engineered starting with Windows 7 to no longer use the PC speaker, and now uses the default sound device.

Answer 1

I've solved this problem right now first step: click on the task bar on the speaker icon go in options and you must toogle system sound. Screenshoot are taken on windows 7 familly prenium french version but it may be nearly the same in newest versions.