C＃ - 連接到FTP服務器

Question

我想建立一個FTPWebRequest的小型FTP客戶端，我只想幫助連接和抓取頭信息以顯示用戶從那裏我想我可以找出其餘的應用程序。

Answer 1

好文章如何構建在.NET中一個簡單的FTP客戶端你會發現這裏http://aspalliance.com/1187_Building_a_Simple_FTP_Application_Using_C_20.all

此外，我可以給你一些建議，比如你要檢查，如果文件可以在FTP服務器上，在你可能會檢查它的大小。

這裏是一個負責該功能：

 public bool IsFtpFileExists(string remoteUri, out long remFileSize) 
     { 
      FtpWebRequest request = (FtpWebRequest)WebRequest.Create(BuildServerUri(remoteUri)); 
      FtpWebResponse response; 

      request.Method = WebRequestMethods.Ftp.GetFileSize; 
      request.Credentials = new NetworkCredential(Username, Password); 
      try 
      { 
       response = (FtpWebResponse)request.GetResponse(); 
       remFileSize = response.ContentLength; 
       return true; 
      } 
      catch (WebException we) 
      { 
       response = we.Response as FtpWebResponse; 
       if (response != null && response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable) 
       { 
        remFileSize = 0; 
        return false; 
       } 
       throw; 
      } 
     } 

Answer 2

這裏是一個樣本來獲得目錄信息。 GetDirectoryInformation方法位於代碼示例的底部。這應該涵蓋基於Windows和Unix的Ftp。還有一個更完整的FTP Client code sample here。

class Ftp 
    { 

     public struct FileStruct 
     { 
      public string Flags; 
      public string Owner; 
      public string Group; 
      public bool IsDirectory; 
      public DateTime CreateTime; 
      public string Name; 
     } 

     public enum FileListStyle 
     { 
      UnixStyle, 
      WindowsStyle, 
      Unknown 
     } 

     private List<FileStruct> GetList(string datastring) 
     { 
      List<FileStruct> myListArray = new List<FileStruct>(); 
      string[] dataRecords = datastring.Split('\n'); 
      FileListStyle _directoryListStyle = GuessFileListStyle(dataRecords); 
      foreach (string s in dataRecords) 
      { 
       if (_directoryListStyle != FileListStyle.Unknown && s != "") 
       { 
        FileStruct f = new FileStruct(); 
        f.Name = ".."; 
        switch (_directoryListStyle) 
        { 
         case FileListStyle.UnixStyle: 
          f = ParseFileStructFromUnixStyleRecord(s); 
          break; 
         case FileListStyle.WindowsStyle: 
          f = ParseFileStructFromWindowsStyleRecord(s); 
          break; 
        } 
        if (!(f.Name == "." || f.Name == "..")) 
        { 
         myListArray.Add(f); 
        } 
       } 
      } 

      return myListArray; ; 
     } 

     private FileStruct ParseFileStructFromWindowsStyleRecord(string Record) 
     { 
      ///Assuming the record style as 
      /// 02-03-11 07:46PM  <DIR>   Append 
      FileStruct f = new FileStruct(); 
      string processstr = Record.Trim(); 
      string dateStr = processstr.Substring(0, 8); 
      processstr = (processstr.Substring(8, processstr.Length - 8)).Trim(); 
      string timeStr = processstr.Substring(0, 7); 
      processstr = (processstr.Substring(7, processstr.Length - 7)).Trim(); 
      f.CreateTime = DateTime.Parse(dateStr + " " + timeStr); 
      if (processstr.Substring(0, 5) == "<DIR>") 
      { 
       f.IsDirectory = true; 
       processstr = (processstr.Substring(5, processstr.Length - 5)).Trim(); 
      } 
      else 
      { 
       string[] strs = processstr.Split(new char[] { ' ' }); 
       processstr = strs[1].Trim(); 
       f.IsDirectory = false; 
      } 
      f.Name = processstr; //Rest is name 
      return f; 
     } 


     public FileListStyle GuessFileListStyle(string[] recordList) 
     { 
      foreach (string s in recordList) 
      { 
       if (s.Length > 10 && Regex.IsMatch(s.Substring(0, 10), "(-|d)(-|r)(-|w)(-|x)(-|r)(-|w)(-|x)(-|r)(-|w)(-|x)")) 
       { 
        return FileListStyle.UnixStyle; 
       } 

       if (s.Length > 8 && Regex.IsMatch(s.Substring(0, 8), "[0-9][0-9]-[0-9][0-9]-[0-9][0-9]")) 
       { 
        return FileListStyle.WindowsStyle; 
       } 
      } 
      return FileListStyle.Unknown; 
     } 

     private FileStruct ParseFileStructFromUnixStyleRecord(string record) 
     { 
      ///Assuming record style as 
      /// dr-xr-xr-x 1 owner group    0 Feb 25 2011 bussys 
      FileStruct f = new FileStruct(); 
      string processstr = record.Trim(); 

      f.Flags = processstr.Substring(0, 9); 
      f.IsDirectory = (f.Flags[0] == 'd'); 

      processstr = (processstr.Substring(11)).Trim(); 

      _cutSubstringFromStringWithTrim(ref processstr, ' ', 0); //skip one part 

      f.Owner = _cutSubstringFromStringWithTrim(ref processstr, ' ', 0); 
      f.Group = _cutSubstringFromStringWithTrim(ref processstr, ' ', 0); 

      _cutSubstringFromStringWithTrim(ref processstr, ' ', 0); //skip one part 

      DateTime createTime = DateTime.Now; 

      var dateString = _cutSubstringFromStringWithTrim(ref processstr, ' ', 8); 
      DateTime.TryParse(dateString, out createTime); 

      f.CreateTime = createTime; 
      f.Name = processstr; //Rest of the part is name 
      return f; 
     } 

     private string _cutSubstringFromStringWithTrim(ref string s, char c, int startIndex) 
     { 
      int pos1 = s.IndexOf(c, startIndex); 
      string retString = s.Substring(0, pos1); 

      s = (s.Substring(pos1)).Trim(); 

      return retString; 
     } 

     public List<FileStruct> GetDirectoryInformation(string ftpUri, NetworkCredential networkCredential) 
     { 
      List<FileStruct> directoryInfo = new List<FileStruct>(); 
      try 
      { 
       FtpWebRequest ftpClientRequest = WebRequest.Create(ftpUri) as FtpWebRequest; 
       ftpClientRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails; 
       ftpClientRequest.Proxy = null; 
       ftpClientRequest.Credentials = networkCredential; 

       FtpWebResponse response = ftpClientRequest.GetResponse() as FtpWebResponse; 
       StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.ASCII); 
       string datastring = sr.ReadToEnd(); 
       response.Close(); 

       directoryInfo = GetList(datastring); 

       return directoryInfo; 
      } 
      catch (Exception e) 
      { 
       return directoryInfo; 
      } 
     } 
    }