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Disabling the windows close icon

Posted on 1998-04-15
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Last Modified: 2010-04-06
Can anyone tell me how to disable the Windows close icon i.e. the X at the top right of a Window.  I also need to enable it as well.

Any help would be appreciated.

David.
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Question by:dl090597
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extreme earned 40 total points
ID: 1361554
This function does what you want, it's in the OnClick event of a button in a form:

procedure TForm1.Button1Click(Sender: TObject);
var
  h : THandle;
  Id : word;
  i : integer;
  Info : TMenuItemInfo;
begin
  h := GetSystemMenu(Handle, False);
  for i := 0 to GetMenuItemCount (h) - 1 do
    begin
      Id := GetMenuItemId (h, i);
      if Id = SC_CLOSE
        then
        begin
          Info.cbSize := sizeof (Info);
          Info.fMask := MIIM_STATE;
          if GetMenuItemInfo (h, Id, false, Info)
            then if Info.fState = MFS_ENABLED
              then EnableMenuItem (h, Id, MF_DISABLED or MF_GRAYED)
              else EnableMenuItem (h, Id, MF_ENABLED)
        end;
    end;
end;

Every time you press the button the function changes the state of the close menu item to the opposite depending on the current state.

Hope this serves you.
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