private void _BGWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
DownloadInfo info = e.UserState as DownloadInfo;
if (info != null)
{
this.progressBar1.Value = info.Persent;
_log.Log("Persent is " + info.Persent + "% .");
if (info.Message == "已取消下载")
{
this.Close();
}
if (info.Message == "下载失败")
{
this.label1.Text = "下载失败";
}
}
}
private bool WebClientDownloadInstallerFile(string url, string fileName)
{
bool resumeDownload = IsResume(url, fileName);
string tempFileName = fileName + ".temp";
string tempInfoFileName = fileName + ".temp" + ".info";
bool isDownloadSuccessfully = false;
FileMode fm = FileMode.Create;
Stream stream = null;
FileStream fileStream = null;
HttpWebResponse response = null;
this._downloadStopWatch.Start();
try
{
Uri installerUrl = new Uri(url);
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.Proxy.Credentials = CredentialCache.DefaultCredentials;
if (resumeDownload)
{
FileInfo fn = new FileInfo(tempFileName);
httpWebRequest.AddRange(fn.Length);
fm = FileMode.Append;
}
response = (HttpWebResponse)httpWebRequest.GetResponse();
stream = response.GetResponseStream();
var etag = GetEtag(response);
if (File.Exists(tempInfoFileName) && !string.IsNullOrEmpty(etag))
{
FileStream f = new FileStream(tempInfoFileName, FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(f);
sw.WriteLine(etag);
sw.Close();
f.Close();
}
double contentLength = DownloadManager.GetContentLength(response);
byte[] buffer = new byte[BufferSize];
long downloadedLength = 0;
int currentDataLength;
fileStream = new FileStream(tempFileName, fm);
while ((currentDataLength = stream.Read(buffer, 0, BufferSize)) > 0 && !this._cancelDownload)
{
fileStream.Write(buffer, 0, currentDataLength);
downloadedLength += (long)currentDataLength;
if (this._downloadStopWatch.ElapsedMilliseconds > 1000)
{
this._downloadStopWatch.Reset();
this._downloadStopWatch.Start();
double doubleDownloadPersent = 0.0;
if (contentLength > 0.0)
{
doubleDownloadPersent = (double)downloadedLength / contentLength;
if (doubleDownloadPersent > 1.0)
{
doubleDownloadPersent = 1.0;
}
}
int intDownloadPersent = (int)(doubleDownloadPersent * 100);
DownloadInfo info = new DownloadInfo()
{
Message = "xxx", Persent = intDownloadPersent
};
DownloadingStatusChanged(info);
}
}
if (this._cancelDownload)
{
DownloadInfo info = new DownloadInfo()
{
Message = "已取消下载", Persent = 100
};
DownloadingStatusChanged(info);
}
else if (currentDataLength >= 0)
{
// downlown correct
isDownloadSuccessfully = true;
}
}
catch (Exception ex)
{
// todo
}
finally
{
this._downloadStopWatch.Stop();
if (fileStream != null)
{
fileStream.Flush();
fileStream.Close();
}
if (stream != null)
{
stream.Close();
}
if (response != null)
{
response.Close();
}
}
if (isDownloadSuccessfully)
{
if (File.Exists(fileName))
{
Util.DeleteFileIfExists(fileName);
}
DownloadInfo info = new DownloadInfo()
{
Message = "xxx", Persent = 100
};
DownloadingStatusChanged(info);
File.Move(tempFileName, fileName);
string tempFileInfoName = fileName + ".temp.info";
if (File.Exists(tempFileInfoName))
{
Util.DeleteFileIfExists(tempFileInfoName);
}
}
return(isDownloadSuccessfully);
}
