webfileloader.cs

饭店类的C＃程序

			for (int i=0; i < NameList.Count; i++)
			{
				//This check is needed because the PROPFIND request returns the contents of the folder
				//as well as the folder itself.  Exclude the folder.
				if (HrefList[i].InnerText.ToLower(new CultureInfo("en-US")).TrimEnd(new char[] {'/'}) != url.ToLower(new CultureInfo("en-US")).TrimEnd(new char[] {'/'}))
				{
					tempResource = new Resource();
					tempResource.Name = NameList[i].InnerText;
					tempResource.IsFolder = Convert.ToBoolean(Convert.ToInt32(isFolderList[i].InnerText));
					tempResource.Url = HrefList[i].InnerText;
					tempResource.LastModified = Convert.ToDateTime(LastModList[i].InnerText);
					ResourceList.Add(tempResource.Url,tempResource);
				}
			}

			return ResourceList;
		}

		//**************************************************************
		// UpdateFileList()	
		// - A multi-file UpdateFile
		//**************************************************************
		public static void UpdateFileList(SortedList fileList, string sourceUrl, string destPath)
		{
			Resource currentResource;

			//If the directory doesn't exist, create it first
			if (!Directory.Exists(destPath))
				Directory.CreateDirectory(destPath);

			foreach(Object o in fileList) 
			{
				currentResource = (Resource)(((DictionaryEntry)o).Value);
	
				string url = sourceUrl + currentResource.Name;
				string FilePath = destPath + currentResource.Name;
				WebFileLoader.UpdateFile(url,FilePath); 
			}
		}

		//**************************************************************
		// GetLastModTime()	
		// - Gets the last mode time for a file on the server
		//**************************************************************
		public static DateTime GetLastModTime(string url)
		{
			HttpWebResponse Response;
			
			HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(url);
			Request.Method = "HEAD";

			try 
			{
				Response = (HttpWebResponse)Request.GetResponse();
			}
			catch(WebException e) 
			{
				Debug.WriteLine("Error accessing Url " + url);
				if (e.Response != null)
					e.Response.Close();
				throw;
			}
		
			DateTime d = System.Convert.ToDateTime(Response.GetResponseHeader("Last-Modified"));
			return d;

		}

		//**************************************************************
		// LoadFile()	
		// - Returns a stream to a file on a web server
		//**************************************************************
		public static Stream LoadFile(string url)
		{
			HttpWebResponse Response;
			
			//Retrieve the File
			HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(url);

			try 
			{
				Response = (HttpWebResponse)Request.GetResponse();
			}
			catch(WebException) 
			{
				Debug.WriteLine("Error accessing Url " + url);
				throw;
			}
		
			return Response.GetResponseStream();	
		}	
		
		//**************************************************************
		// CheckForFileUpdate()	
		// - Checks if the file on the server is newer than the given date
		//**************************************************************
		public static bool CheckForFileUpdate(string url, DateTime lastModeTime)
		{
			HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(url);
			Request.Method = "HEAD";

			Request.IfModifiedSince = lastModeTime;
			
			HttpWebResponse Response;
			try 
			{
				Response = (HttpWebResponse)Request.GetResponse();
			}
			catch(WebException e) 
			{
				if (e.Response == null)
				{
					Debug.WriteLine("Error accessing Url " + url);
					throw;
				}
			
				HttpWebResponse errorResponse = (HttpWebResponse)e.Response;

				//if the file has not been modified
				if (errorResponse.StatusCode == HttpStatusCode.NotModified)
				{
					e.Response.Close();
					return false;
				}
				else 
				{
					e.Response.Close();
					Debug.WriteLine("Error accessing Url " + url);
					throw;
				}
			}
			//This case happens if no lastmodedate was specified, but the specified
			//file does exist on the server. 
			Response.Close();
			return true;
		}

		//**************************************************************
		// GetFileCount()	
		// - Gets the list of files on the server.  Useful when downloading
		// many files and you need the file count for a progress indicator
		//**************************************************************
		public static int GetFileCount(string filePath)
		{

			string[] directories = Directory.GetDirectories(filePath);
			string[] files = Directory.GetFiles(filePath);
			string name;

			int count=0;
			count = files.Length + directories.Length;

			foreach (string directory in directories)
			{
				name = directory.Remove(0,directory.LastIndexOf("\\")+1);
				
				count = count + GetFileCount(filePath + name + "\\");
			}
			
			return count;
		}

		//**************************************************************
		// CopyStreamToDisk()	
		//**************************************************************
		private static void CopyStreamToDisk(Stream responseStream, String filePath)
		{
			byte[] buffer = new byte[4096];
			int length;
			
			//Copy to a temp file first so that if anything goes wrong with the network
			//while downloading the file, we don't actually update the real on file disk
			//This essentially gives us transaction like semantics.
			Random Rand = new Random();
			string tempPath = Environment.GetEnvironmentVariable("temp") + "\\";
			tempPath += filePath.Remove(0,filePath.LastIndexOf("\\")+1);
			tempPath += Rand.Next(10000).ToString() + ".tmp";

			FileStream AFile = File.Open(tempPath,FileMode.Create,FileAccess.ReadWrite);
			
			length = responseStream.Read(buffer,0,4096);
			while ( length > 0)
			{
				AFile.Write(buffer,0,length);
				length = responseStream.Read(buffer,0,4096);
			}
			AFile.Close();	

			if (File.Exists(filePath))
				File.Delete(filePath);
			File.Move(tempPath,filePath);
		}

		//**************************************************************
		// LastModFromDisk()	
		//**************************************************************
		public static DateTime LastModFromDisk(string filePath)
		{
			FileInfo f = new FileInfo(filePath);
			return (f.LastWriteTime);
		}

		//**************************************************************
		// CopyAndRename()	
		//**************************************************************
		public static void CopyAndRename(string source, string dest)
		{
			string[] directories = Directory.GetDirectories(source);
			string[] files = Directory.GetFiles(source);
			string name;

			//If the directory doesn't exist, create it first
			if (!Directory.Exists(dest))
				Directory.CreateDirectory(dest);

			foreach (string file in files)
			{
				name = file.Remove(0,file.LastIndexOf("\\")+1);
				MessageBox.Show(name);
				
				if (File.Exists(dest+name))
					File.Delete(dest+name);
				
				File.Move(file, dest+name);
			}

			foreach (string directory in directories)
			{
				name = directory.Remove(0,directory.LastIndexOf("\\")+1);
				MessageBox.Show(name);

				if (!Directory.Exists(dest + name + "\\"))
					Directory.CreateDirectory(dest + name + "\\");
				
				CopyAndRename(source + name + "\\", dest + name + "\\");
			}

			Directory.Delete(source,true);
		}

		//**************************************************************
		// CreateHttpsUrl()	
		//**************************************************************
		public static string CreateHttpsUrl(string url)
		{
			url = url.ToLower(new CultureInfo("en-US"));
			if (url.StartsWith("https"))
				return url;
			else
			{
				return url.Insert(4,"s");
			}
		}
	}
}