ftp損壞的exe和dll文件（C＃）

我有以下代碼用於從服務器下載文件，該文件適用於文本文件。代碼取自MSDN示例：ftp損壞的exe和dll文件（C＃）

public void DownloadFile(string serverPath, string localPath) 
     { 

      try 
      { 
       FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://" + serverPath); 

       request.Method = WebRequestMethods.Ftp.DownloadFile; 
       request.Credentials = new NetworkCredential(_domain + "\\" + _username, _password); 
       FtpWebResponse response = (FtpWebResponse)request.GetResponse(); 
       Stream responseStream = response.GetResponseStream(); 
       StreamReader reader = new StreamReader(responseStream); 
       string contents = reader.ReadToEnd(); 
       File.WriteAllText(localPath, contents); 

       reader.Close(); 
       response.Close(); 

      } 
      catch (WebException ex) 
      {     
       string exMsg = string.Empty; 


       //add more error codes    
       FtpWebResponse response = (FtpWebResponse)ex.Response; 
       MessageBox.Show(response.StatusCode.ToString()); 

       switch(response.StatusCode) { 
        case FtpStatusCode.NotLoggedIn: 
         exMsg = "wrong password"; 
         break; 

        case FtpStatusCode.ActionNotTakenFileUnavailable: 
         exMsg = "file you are trying to load is not found"; 
         break; 

        default: 
         exMsg = "The server is inaccessible or taking too long to respond."; 
         break; 
       } 

       throw new Exception(exMsg); 
      } 

      return; 
     }

但是，它會破壞dll和exe。任何想法是什麼是這裏的罪魁禍首？

來源

2012-09-26 sarsnake

可能是編碼在File.WriteAllText中是錯誤的... WriteAllText的默認編碼是utf8 –

StreamReader旨在讀取文本數據（它是一個TextReader），所以使用它會破壞任何二進制文件。

您需要直接從流中讀取數據。

你應該能夠做到：

Stream responseStream = response.GetResponseStream(); 

// Don't read/write as text! 
// StreamReader reader = new StreamReader(responseStream); 
// string contents = reader.ReadToEnd(); 
// File.WriteAllText(localPath, contents); 

using (var output = File.OpenWrite(localPath)) 
{ 
    responseStream.CopyTo(output); 
}

編輯：

由於您使用.NET 3.5，您可以手動複製流：

Stream responseStream = response.GetResponseStream(); 
using (var output = File.OpenWrite(localPath)) 
{ 
    byte[] buffer = new byte[32768]; 
    int read; 
    while ((read = input.Read(buffer, 0, buffer.Length)) > 0) 
    { 
     output.Write (buffer, 0, read); 
    } 
}

來源

2012-09-26 16:38:30

Stream沒有函數CopyTo（）。 – sarsnake

@sarsnake它在.NET 4.0+中運行（http://msdn.microsoft.com/zh-cn/library/dd782932.aspx）如果您使用的是3.5或更低版本，請參閱：http://stackoverflow.com/ a/230141/65358 –

我使用3.5，對不起，我會更新問題 – sarsnake

試試看：

request.UseBinary = true;

來源

2012-09-26 16:40:56 Max

ftp損壞的exe和dll文件（C＃）

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