回调函数

type
  EnumWindowsProc = function (Hwnd: THandle;
    Param: Pointer): Boolean; stdcall;

function GetTitle (Hwnd: THandle; Param: Pointer): Boolean; stdcall;
var
  Text: string;
begin
  SetLength (Text, 100);
  GetWindowText (Hwnd, PChar (Text), 100);
  FormCallBack.ListBox1.Items.Add (
    IntToStr (Hwnd) + ': ' + Text);
  Result := True;
end;

procedure TFormCallback.BtnTitlesClick(Sender: TObject);
var
  EWProc: EnumWindowsProc;
begin
  ListBox1.Items.Clear;
  EWProc := GetTitle;
  EnumWindows (@EWProc, 0);
end;

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