uses
  Windows;

{$POINTERMATH ON}
procedure SendKeys(const S: String);
var
  InputEvents: PInput;
  I, J: Integer;
begin
  if S = '' then Exit;
  GetMem(InputEvents, SizeOf(TInput) * (Length(S) * 2));
  try
    J := 0;
    for I := 1 to Length(S) do
    begin
      InputEvents[J].Itype := INPUT_KEYBOARD;
      InputEvents[J].ki.wVk := 0;
      InputEvents[J].ki.wScan := Ord(S[I]);
      InputEvents[J].ki.dwFlags := KEYEVENTF_UNICODE;
      InputEvents[J].ki.time := 0;
      InputEvents[J].ki.dwExtraInfo := 0;
      Inc(J);
      InputEvents[J].Itype := INPUT_KEYBOARD;
      InputEvents[J].ki.wVk := 0;
      InputEvents[J].ki.wScan := Ord(S[I]);
      InputEvents[J].ki.dwFlags := KEYEVENTF_UNICODE or KEYEVENTF_KEYUP;
      InputEvents[J].ki.time := 0;
      InputEvents[J].ki.dwExtraInfo := 0;
      Inc(J);
    end;
    SendInput(J, InputEvents[0], SizeOf(TInput));
  finally
    FreeMem(InputEvents);
  end;
end;