IdHTTP下载文件,怎么加个进度条?

Question

怎么加一个ProgressBar进度条,显示进度?
function TFrAutoUpdate.DownLoadFile(sURL, sFName: string): boolean;
var
  tStream: TMemoryStream;
begin
  Result := False;
  tStream := TMemoryStream.Create;
  try { 防止不可预料错误发生 }
    sURL := IdHTTP1.URL.URLEncode(sURL); { 下载路径进行编码转换 }
    try
      IdHTTP1.Get(sURL, tStream); { 保存到内存流 }
      tStream.SaveToFile(sFName); { 保存为文件 }
      Result := True;
    except
    end;
  finally { 即使发生不可预料的错误也可以释放资源 }
    tStream.Free;
  end;
end;

Answer 1

IdHTTP 事件OnWork 写入 pb1.Position := AWorkCount
                       OnWorkBegin 写入  pb1.Max := AWorkCountMax;                                                           pb1.Position := 0;就行了

Answer 2

处理3个事件
OnWorkBegin AWorkCountMax则为下载的总字节数
OnWork AWorkCount则为已下载的字节数
OnWorkEnd 下载结束进度条最大值设置为100，在OnWorkBegin中记录总字节数，在OnWork中用 AWorkCount/总字节数*100取整后设置给进度条。

Answer 3

进度同楼上..另外,如果只是下载文件,更简单可直接调用api  函数.UrlDownloadToFile

Answer 4

procedure TUpdatefrm.IdHTTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode);
begin
  ProgressBar1.Position := ProgressBar1.Max;
end;procedure TUpdatefrm.IdHTTP1Work(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCount: Integer);
begin
  ProgressBar1.Position := AWorkCount;
end;procedure TUpdatefrm.IdHTTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCountMax: Integer);
begin
  ProgressBar1.Max := AWorkCountMax;
  ProgressBar1.Min := 0;
  ProgressBar1.Position := 0;
end;

Answer 5

procedure TfrmMain.IdHTTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCountMax: Integer);
begin
  ProgressBar1.Max:=AWorkCountMax;
  ProgressBar1.Min:=0;
  ProgressBar1.Position:=0;
end;procedure TfrmMain.IdHTTP1Work(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCount: Integer);
begin
 ProgressBar1.Position:=ProgressBar1.Position+AWorkCount;
end;