使用Delphi和Indy，使用Progress事件以编程方式从Internet下载文件

问题描述：

我需要一种使用Delphi通过HTTP从Internet下载文件的方式，
包含一个Progress事件，我正在寻找一种使用Indy组件的方法。

I need a way to download a file from the Internet using Delphi via HTTP, Wich include an Progress event , I'm looking for a method wich uses the Indy components.

我正在使用Delphi 7。

I am using Delphi 7.

提前感谢

答

我已经编写了这个例子，只使用一个HTTP GET，与Indy 10，希望它与Indy 9一起工作：

I've coded this example, using just one HTTP GET, with Indy 10, hope it works with Indy 9 too:

uses
  {...} IdHTTP, IdComponent;

type
  TFormMain = class(TForm)
    {...}
  private
    {...}
    procedure HttpWork(ASender: TObject; AWorkMode: TWorkMode; AWorkCount: Int64);
  end;
{...}

procedure TFormMain.Button1Click(Sender: TObject);
var
  Http: TIdHTTP;
  MS: TMemoryStream;
begin
  Http := TIdHTTP.Create(nil);
  try
    MS := TMemoryStream.Create;
    try
      Http.OnWork:= HttpWork;

      Http.Get('http://live.sysinternals.com/ADExplorer.exe', MS);
      MS.SaveToFile('C:\ADExplorer.exe');

    finally
      MS.Free;
    end;
  finally
    Http.Free;
  end;
end;

procedure TFormMain.HttpWork(ASender: TObject; AWorkMode: TWorkMode; AWorkCount: Int64);
var
  Http: TIdHTTP;
  ContentLength: Int64;
  Percent: Integer;
begin
  Http := TIdHTTP(ASender);
  ContentLength := Http.Response.ContentLength;

  if (Pos('chunked', LowerCase(Http.Response.TransferEncoding)) = 0) and
     (ContentLength > 0) then
  begin
    Percent := 100*AWorkCount div ContentLength;

    MemoOutput.Lines.Add(IntToStr(Percent));
  end;
end;

使用Delphi和Indy，使用Progress事件以编程方式从Internet下载文件

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