如何通过FTP使用C＃下载压缩文件（.zip文件）？ [英] how to download compressed file (.zip) through FTP using c#?

问题描述

如何使用C＃代码下载.zip文件格式？

下面是代码，我使用的下载。只是要突出，如果我下载的.txt文件，它工作正常。如果我下载.zip文件，它下载.zip文件，但我无法打开此。它抱怨.zip文件是格式不正确。我有疑问，怎么我写回本地驱动器上的文件。

帮助？

 字符串ftpServerIP = FTPServer的; 
串ftpUserID =名为ftpuser; 
串ftpPassword = FTPPwd; 
 FileInfo的fileInf =新的FileInfo（文件名）; 
字符串URI =FTP：//+ ftpServerIP +/+ fileInf.Name; 
的FtpWebRequest reqFTP =（的FtpWebRequest）FtpWebRequest.Create（URI）; //新的URI（FTP：//+ ftpServerIP + DestinationFolder + fileInf.Name））; 
 reqFTP.Credentials =新的NetworkCredential（ftpUserID，ftpPassword）; 
 reqFTP.EnableSsl = TRUE; 
 reqFTP.KeepAlive = FALSE; 
 reqFTP.UseBinary = TRUE; 
 //reqFTP.UsePassive = TRUE; 
 reqFTP.Method = WebRequestMethods.Ftp.DownloadFile; 
 ServicePointManager.ServerCertificateValidationCallback =新System.Net.Security.RemoteCertificateValidationCallback（AcceptAllCertifications）; 
 //流STRM = reqFTP.GetRequestStream（）; 
 StreamReader的读者=新的StreamReader（reqFTP.GetResponse（）GetResponseStream（））; 
 StreamWriter的作家=新的StreamWriter（Path.Combine（FolderToWriteFiles，文件名），FALSE）; 
 writer.Write（reader.ReadToEnd（））; 
返回真; 
  

解决方案

 使用系统。净; 
 // ... 
 
新的WebClient（）DownloadFile（ftp://ftp.someurl.com/file.zip，
C：\\\ \\downloadedFile.zip）; 
  

---

答到更新的问题：

您正在保存的流盘的方式是错误的。你正在处理该流作为一个字符序列，从而破坏过程中的ZIP文件。打开的的FileStream 代替的StreamWriter 并复制 GetResponseStream（）返回值直接到的FileStream 使用类似的我的 CopyStream 函数从这里。

How to download .zip file format using c# code?

Here is the code, i am using to download. Just to highlight, If i download .txt file, it works fine. If i download .zip file, it downloads the .zip file but i can't open this. It complains that .zip is in incorrect format. I have doubt in how i am writing back the file on local drive.

Help?

string ftpServerIP = FTPServer;
string ftpUserID = FTPUser;
string ftpPassword = FTPPwd;
FileInfo fileInf = new FileInfo(FileName);
string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri); //new Uri("ftp://" + ftpServerIP + DestinationFolder + fileInf.Name));
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.EnableSsl = true;
reqFTP.KeepAlive = false;
reqFTP.UseBinary = true;
//reqFTP.UsePassive = true;
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications);
//Stream strm = reqFTP.GetRequestStream();
StreamReader reader = new StreamReader(reqFTP.GetResponse().GetResponseStream());
StreamWriter writer = new StreamWriter(Path.Combine(FolderToWriteFiles, FileName), false);
writer.Write(reader.ReadToEnd());
return true; 

解决方案

using System.Net;
// ...

new WebClient().DownloadFile("ftp://ftp.someurl.com/file.zip",
                             "C:\\downloadedFile.zip");

---

Answer to the updated question:

The way you are saving the stream to disk is wrong. You are treating the stream as a character sequence, which corrupts the ZIP file in the process. Open a FileStream instead of a StreamWriter and copy the GetResponseStream() return value directly to that FileStream using something like my CopyStream function from here.

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