unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ShellAPI, Grids, StdCtrls;

type
  TForm1 = class(TForm)
    lb: TListBox;
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    procedure WMDropFiles(var M: TMessage); message WM_DROPFILES;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

var
  CountFiles: integer;
  SizeName: integer;
  cch: integer;

var
  hDrop: integer;
  Point: TPoint;
  lpszFile: PChar;

{$R *.DFM}

procedure TForm1.WMDropFiles(var M: TMessage);
var
  i: integer;
begin
  hDrop := M.WParam;
  DragQueryPoint(hDrop, Point);
  CountFiles := DragQueryFile(hDrop, $FFFFFFFF, nil, cch);
  for i := 0 to CountFiles - 1 do
  begin
    SizeName := DragQueryFile(hDrop, i, nil, cch);
    GetMem(lpszFile, SizeName + 1);
    DragQueryFile(hDrop, i, lpszFile, SizeName + 1);
    lb.Items.Add(lpszFile);
    FreeMem(lpszFile, SizeName + 1);
  end;
  DragFinish(hDrop);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  DragAcceptFiles(Handle, True);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  lb.Items.Clear;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  ShellAbout(Handle, 'Anton Saburov', 'APSystems', 0);
end;

end.