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Set NumLock State in Delphi 2.0

Posted on 1998-09-21
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Last Modified: 2010-05-18
How can I set the State of the NumLock Key in Windows 95 and NT 4.0? I tried the version listed in the win32 help file - it works with CapsLock and ScrollLock - but not with the NumLock. Does this depend on the manufactor of the PC?
Please give a "clean" solution - if possible without hardware direct access. (PTM@Datacomm.ch)
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Question by:ptmcomp
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duke_n earned 100 total points
ID: 1340480
hi !
I had this problem before I found this somewhere.
Let's say you want to change the numlock state to the opposite:

procedure TMyForm.Button1Click(Sender: TObject);
  Var
    KeyState  :  TKeyboardState;
  begin
    GetKeyboardState(KeyState);
    if (KeyState[VK_NUMLOCK] = 0) then
      KeyState[VK_NUMLOCK] := 1
    else
      KeyState[VK_NUMLOCK] := 0;
    SetKeyboardState(KeyState);
  end;

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by:ptmcomp
ID: 1340481
I'm surprised because in the winapi help is written that this does'nt work but indeed it does. Thanks for your prompt answer.
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