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Delphi source code for Miscellaneous >> Detect a keypress during a loop


Category: Miscellaneous
Title: Detect a keypress during a loop
Date added: 15.03.2006
Hits: 17804



procedure TForm1.Button1Click(Sender: TObject);
var
  LoopAborted: Boolean;
  i: Integer;
begin
  LoopAborted := False;
  i := 0;
  repeat
    Caption := IntToStr(i);
    Application.ProcessMessages;
    if GetKeyState(VK_Escape) and 128 = 128 then
    begin
      LoopAborted := True;
      Break;
    end;
    Inc(i);
  until i = 100000;
  if LoopAborted then
    ShowMessage('User has aborted the loop!');
end;


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