在ftp服务器上传时文件更大 [英] File Bigger when uploading on ftp server

问题描述

我想从我的应用程序上传文件到ftp服务器。

但是当上传完成时，上传的文件比原来的文件要大

我发现了如果我有1024字节的缓冲区并且在最后一轮只有512被占用，它还将剩余的0512字节写入文件



这是我的代码：

I want to upload a file to a ftp server from my application.
But when upload completes, the file uploaded is bigger than the original one
I have discovered that if I have of buffer of 1024 bytes and on the last turn only 512 are occupied, it also writes the rest "0" 512 bytes to the file

Here is my code:

public bool UploadArticol(String adresaserver,String numefisier)
        {
            try
            {
                FileInfo toupload = new FileInfo("articles\\"+numefisier+".dat");
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://"+adresaserver+"/" + toupload.Name);
                request.Method = WebRequestMethods.Ftp.UploadFile;
                request.Credentials = new NetworkCredential("lucian", "lucian");
                Stream ftpstream = request.GetRequestStream();
                FileStream file = File.OpenRead("articles\\"+numefisier+".dat");
                int length = 1048576;
                byte[] buffer = new byte[length];
                int bytesread = 0;
                do
                {
                    bytesread = file.Read(buffer, 0, length);
                    ftpstream.Write(buffer, 0, length);
                }
                while (bytesread != 0);
                file.Flush();
                file.Close();
                ftpstream.Close();
               Console.WriteLine("Upload complete");
               
            }
            catch (Exception ee)
            {
               Console.WriteLine(ee.Message);
               return false;
            }
            return true;
        }

推荐答案

无论实际读取多少数据，您总是以1048576字节为单位写入数据。 />
两种选择：

1.将Write（）更改为：

You are always writing the data in blocks of 1048576 bytes no matter how many are actually read.
Two choices:
1. Change the Write() to be:

ftpstream.Write(buffer, 0, bytesread);

2.只需拥有两个流直接交易：

2. Just have the two streams deal with each other directly:

public bool UploadArticol(String adresaserver, String numefisier)
{
  string uploadname = "articles\\"+numefisier+".dat";
  try
  {
    FileInfo toupload = new FileInfo(uploadname);
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://"+adresaserver+"/" + toupload.Name);
    request.Method = WebRequestMethods.Ftp.UploadFile;
    request.Credentials = new NetworkCredential("lucian", "lucian");
    Stream ftpstream = request.GetRequestStream();
    using (FileStream file = File.OpenRead(uploadname))
    {
      file.CopyTo(ftpstream);
    }
    Console.WriteLine("Upload complete");
  }
  catch (Exception ee)
  {
    Console.WriteLine(ee.Message);
    return false;
  }
  return true;
}

你可能还需要在流对象上使用Flush（）方法...

如果你还有问题，请参考这些链接..

http://www.digitalcoding.com/Code-Snippets/C-Sharp/C-Code-Snippet-Upload-file-to-FTP-Server.html [< a href =http://www.digitalcoding.com/Code-Snippets/C-Sharp/C-Code-Snippet-Upload-file-to-FTP-Server.htmltarget =_ blanktitle =New Window > ^ ]

http://blog.pbdesk.com/2009/03/uploading-files-to-ftp-server-using.html [ ^ ]

you may need to use Flush() method on stream object as well...
if you have still issues, refer these links..
http://www.digitalcoding.com/Code-Snippets/C-Sharp/C-Code-Snippet-Upload-file-to-FTP-Server.html[^]
http://blog.pbdesk.com/2009/03/uploading-files-to-ftp-server-using.html[^]

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