錯誤嘗試使用C＃ftpwebrequest到ftp xml文件到Zebra打印機

Question

我已經使用ZebraDesigner for xml ver2.0爲Zebra 170PAX4打印機創建了一些標籤模板。我已經成功地將zpl導出到Zebra，並且我可以在Windows命令提示符中使用ftp編輯和發送xml文件到Zebra，例如：c:\ftp 10.161.41.212 Connected to 10.161.41.212. 220 ZBR-46688 Version 1.01.7 ready. User (10.161.41.212:(none)): 230 User logged in. ftp> put c:SPver1_1.xml 200 PORT command successful. 150 Opening ASCII mode data connection for SPver1_1.xml. 226 Transfer complete. ftp: 324 bytes sent in 0.00Seconds 324000.00Kbytes/sec

現在，我正在嘗試使用MS VS2010和C＃從WinForms應用程序自動執行此操作。但由於某些原因沒有什麼，我似乎使用的FtpWebRequest類的嘗試，我還收到一個錯誤

The remote server returned an error: (502) Command not implemented.

據我瞭解，ftp方法UploadFile相同STOR這是相同的別名放。我使用的代碼如下所示：

public bool PutXmlFile(CZebraPrinter printer, CDeviceContainer devices) 
    { 
     bool OK = true; 
     CDevice currDevice = new CDevice(); 
     currDevice = devices.GetDevice(this.m_devName); 
     string ftpHost = "ftp://" + printer.m_IPAddress + "/"; 
     string ftpPath = "E:"; 
     Uri printerUri = new Uri(ftpHost + ftpPath); 

     try 
     { 
      FtpWebRequest ftpRequest = (FtpWebRequest)WebRequest.Create(printerUri); 
      ftpRequest.Method = WebRequestMethods.Ftp.UploadFile; 
      ftpRequest.KeepAlive = false; 
      ftpRequest.UseBinary = false; 
      ftpRequest.UsePassive = false; 
      ftpRequest.Timeout = 5000; //milliseconds 

      // The Zebra printer uses anonymous login 
      ftpRequest.Credentials = new NetworkCredential("anonymous", ""); 

      // Copy the contents of the file to the request stream. 
      StreamReader sourceStream = new StreamReader(currDevice.m_defaultDataFile); 
      byte[] fileContents = Encoding.ASCII.GetBytes(sourceStream.ReadToEnd()); 
      sourceStream.Close(); 

      Stream requestStream = ftpRequest.GetRequestStream(); 
      requestStream.Write(fileContents, 0, fileContents.Length); 
      requestStream.Close(); 

      FtpWebResponse response = (FtpWebResponse)ftpRequest.GetResponse(); 
      //Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription); 
      //Check response 
      response.Close(); 
     } 
     catch (Exception ex) 
     { 
      string errMessage = string.Format("An error occured trying to ftp the device xml file to the Zebra printer. \n\nReason:\n{0}", ex.Message); 
      MessageBox.Show(errMessage, m_mfgInfoErr, MessageBoxButtons.OK, MessageBoxIcon.Error); 
      return !OK; 
     } 
     return OK; 
    } 

有沒有人看到我可能做錯了什麼。任何想法，將不勝感激。 謝謝。

我跑的痕跡，這裏是輸出：

System.Net Information: 0 : [4780] FtpWebRequest#14993092::.ctor(ftp://10.161.41.212/E:) 
System.Net Verbose: 0 : [4780] Exiting WebRequest::Create()  -> FtpWebRequest#14993092 
System.Net Verbose: 0 : [4780] FtpWebRequest#14993092::GetRequestStream() 
System.Net Information: 0 : [4780] FtpWebRequest#14993092::GetRequestStream(Method=STOR.) 
System.Net Information: 0 : [4780] Associating FtpWebRequest#14993092 with FtpControlStream#720107 
System.Net Information: 0 : [4780] FtpControlStream#720107 - Received response [220 ZBR-46688 Version 1.01.7 ready.] 
System.Net Information: 0 : [4780] FtpControlStream#720107 - Sending command [USER anonymous] 
System.Net Information: 0 : [4780] FtpControlStream#720107 - Received response [230 User logged in.] 
System.Net Information: 0 : [4780] FtpControlStream#720107 - Sending command [OPTS utf8 on] 
System.Net Information: 0 : [4780] FtpControlStream#720107 - Received response [502 Command 'OPTS' not implemented.] 
System.Net Information: 0 : [4780] FtpControlStream#720107 - Sending command [PWD] 
System.Net Information: 0 : [4780] FtpControlStream#720107 - Received response [502 Command 'PWD' not implemented.] 
System.Net Information: 0 : [4780] FtpWebRequest#14993092::(Releasing FTP connection#720107.) 
System.Net Error: 0 : [4780] Exception in the FtpWebRequest#14993092::GetRequestStream - The remote server returned an error: (502) Command not implemented. 

所以看起來OPTS和PWD都是問題。有沒有辦法控制FtpWebRequest發送的內容，還是我需要第三方庫？

Answer 1

UploadFile使用STOR命令，但在發送此命令之前，.NET有時會發送其他命令，例如「OPTS utf8 on」或「TYPE I」等。如果您爲您的應用程序創建了以下內容的配置文件：

<?xml version="1.0"?> 
<configuration> 
    <system.diagnostics> 
    <sharedListeners> 
     <add name="console" type="System.Diagnostics.TextWriterTraceListener" initializeData="c:\logfile.txt" /> 
    </sharedListeners> 
    <sources> 
     <source name="System.Net" switchName="sourceSwitch"> 
     <listeners> 
      <add name="console" /> 
     </listeners> 
     </source> 
    </sources> 
    <switches> 
     <add name="sourceSwitch" value="Verbose"/> 
    </switches> 
    </system.diagnostics> 
</configuration> 

所有的命令和響應都會記錄在文件中，所以你可以看看，哪一個會導致問題。

UPDATE： 所以問題是，發出STOR命令之前，FTP客戶端發送OPTS和PWD命令，您的打印機不明白，可能是因爲它是非常輕量級的FTP服務器。不幸的是，我不知道如何阻止這些命令的發送。我在我的腦海裏只有兩種解決方法：

• 找到一些第三方FTP庫，它不會發送那些有問題的命令。
• 因爲在命令行上載文件的作品，創建相應的文件（commands.txt中）「把」命令，然後開始從你的程序是這樣的FTP傳輸：

Process.Start("ftp", "-A -s:commands.txt " + printer.m_IPAddress);

Answer 2

在ftpRequest（ FtpWebRequest）創建，我們有一個屬性EnableSsl。如果FTP站點中的SSL被禁用，則該標誌需要設置爲false，否則該標誌需要設置爲true。

ftpRequest.EnableSsl = true; 

這必須在打開StreamReader之前完成。