delphi 读取文件的MD5值

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    btn1: TButton;
    OpenSwf1: TOpenDialog;
    edt1: TEdit;
    procedure btn1Click(Sender: TObject);
  private
    function StreamToMD5(S: TFileStream): String;
    { Private declarations }
  public
    { Public declarations www.delphitop.com}
  end;

type
TMD5 = class(TIdHashMessageDigest5);

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btn1Click(Sender: TObject);
var
  filesen:TFileStream;
begin
 if  OpenSwf1.Execute then
   begin
        filesen:=TFileStream.Create(OpenSwf1.FileName,fmOpenRead or fmShareExclusive);
        edt1.Text:=StreamToMD5(filesen);
        filesen.Free;
   end;
end;

 //读文件MD5值
function TForm1.StreamToMD5(S: TFileStream): String;
var
Md5Encode: TMD5;
begin
Md5Encode:= TMD5.Create;
try
    Result :=Md5Encode.HashStreamAsHex(s) ;
finally
    Md5Encode.Free;
end;
end;

end.