private static void SaveFingerPrint(String destFileName, FingerPrint fingerPrint)
{
String fingerPrintFileName = FileDownloadHelper.MakeFingerPrintFilePath(destFileName);
SecurityElement finger_print = new SecurityElement("finger_print");
finger_print.AddAttribute("time_stamp", fingerPrint.timeStamp);
finger_print.AddAttribute("file_size", fingerPrint.fileSize.ToString());
File.WriteAllText(fingerPrintFileName, finger_print.ToString());
}
private static FingerPrint LoadFingerPrint(String destFileName)
{
String fingerPrintFileName = FileDownloadHelper.MakeFingerPrintFilePath(destFileName);
if (!File.Exists(fingerPrintFileName)) //记录文件尚未创建
{
return new FingerPrint {
timeStamp = "", fileSize = 0
}
}
;
try
{
SecurityElement xmlDoc = SecurityElement.FromString(File.ReadAllText(fingerPrintFileName));
String timeStamp = xmlDoc.Attributes["time_stamp"].ToString();
Int64 fileSize = Int64.Parse(xmlDoc.Attributes["file_size"].ToString());
return(new FingerPrint {
timeStamp = timeStamp, fileSize = fileSize
});
}
catch (IOException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (System.IO.IsolatedStorage.IsolatedStorageException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (XmlSyntaxException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (FormatException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (NullReferenceException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
}
/// <summary>
/// return false when no more task
/// </summary>
/// <returns></returns>
private Boolean WorkOnce()
{
Task activeTask;
DownloadTaskInfo activeTaskSnapshot;
lock (m_lock)
{
if (m_taskQueue.Count == 0) //nothing to do
{
return(false);
}
activeTask = m_taskQueue[0];
m_taskQueue.RemoveAt(0);
activeTaskSnapshot = activeTask.ToDownloadTaskInfo();
activeTask.status = DownloadTaskStatus.Downloading;
}
if (File.Exists(activeTaskSnapshot.localPath)) //local file exist, check whether already finished
{
if (!FileDownloadHelper.IsFileInProgress(activeTaskSnapshot.localPath))
{
Int64 fileSize;
if (CalcFileMd5AndSize(activeTaskSnapshot.localPath, out fileSize) == activeTaskSnapshot.md5)
{
lock (m_lock)
{
activeTask.status = DownloadTaskStatus.Finished;
activeTask.totalSize = fileSize;
activeTask.finishedSize = fileSize;
RaiseTaskEndEvent(activeTask.ToDownloadTaskInfo());
return(true);
}
}
else //file content is not correct
{
File.Delete(activeTaskSnapshot.localPath);
//download again
}
}
}
FileDownloadHelper downloadHelper = new FileDownloadHelper();
Boolean bCanceled = false;
downloadHelper.ProgressChanged += (sender, arg) =>
{
//update task status
lock (m_lock)
{
if (!activeTask.status.CanPause()) //stopped
{
downloadHelper.Cancel();
bCanceled = true;
}
else
{
activeTask.totalSize = arg.TotalFileSize;
activeTask.finishedSize = arg.CurrentFileSize;
}
}
};
downloadHelper.DownloadComplete += (sender, arg) =>
{
};
try
{
Directory.CreateDirectory(m_rootDir);
downloadHelper.Download(activeTask.url, activeTask.localPath);
if (!bCanceled)
{
Int64 fileSize;
if (CalcFileMd5AndSize(activeTaskSnapshot.localPath, out fileSize) == activeTaskSnapshot.md5)
{
lock (m_lock)
{
activeTask.status = DownloadTaskStatus.Finished;
activeTask.totalSize = fileSize;
activeTask.finishedSize = fileSize;
}
}
else //md5 dismatch
{
File.Delete(activeTaskSnapshot.localPath);
lock (m_lock)
{
activeTask.status = DownloadTaskStatus.Failed;
activeTask.errorCode = DownloadTaskErrorCode.Md5Dismatch;
}
}
}
}
catch (WebException e)
{
lock (m_lock)
{
activeTask.status = DownloadTaskStatus.Failed;
activeTask.errorCode = DownloadTaskErrorCode.NetworkError;
activeTask.innerErrorCode = (Int32)e.Status;
activeTask.errorMessage = e.Message;
}
}
catch (IOException e)
{
lock (m_lock)
{
activeTask.status = DownloadTaskStatus.Failed;
activeTask.errorCode = DownloadTaskErrorCode.IOError;
activeTask.innerErrorCode = 0;
activeTask.errorMessage = e.Message;
}
}
if (!bCanceled)
{
RaiseTaskEndEvent(activeTask.ToDownloadTaskInfo());
}
return(true);
}
private static void DeleteDestFile(String destFileName)
{
File.Delete(FileDownloadHelper.MakeFingerPrintFilePath(destFileName));
File.Delete(destFileName);
}