testdll.pas

一个自己写的加密/解密DLL文件

unit testdll;

interface

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

type

  TBase64String =  function ( DataStr: string; Encrypt: Integer):PChar; stdcall;
  TForm1 = class(TForm)
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private declarations }
    dllHandle: THandle;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

  Base64String: TBase64String;


implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
   f: string;
begin
   f := 'ciper.dll';
   dllHandle := LoadLibrary(PChar( f ));
   if dllHandle <> 0 then begin
      @Base64String := GetProcAddress( dllHandle,'Base64String');
      if @Base64String = nil then
         exit;
   end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
   edit2.Text := Base64String( edit1.Text, 1 );
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
   edit3.Text := Base64String( edit2.Text, 0 );
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
   FreeLibrary( dllHandle );
end;

end.