idhttp 下载 添加进度条显示

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;

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。

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;