使用的FtpWebRequest下载文件 [英] Downloading Files Using FTPWebRequest

问题描述

我想使用的FtpWebRequest下载文件。

I'm trying to download a file using FTPWebRequest.

    private void DownloadFile(string userName, string password, string ftpSourceFilePath, string localDestinationFilePath)
    {
        int bytesRead = 0;
        byte[] buffer = new byte[1024];

        FtpWebRequest request = CreateFtpWebRequest(ftpSourceFilePath, userName, password, true);
        request.Method = WebRequestMethods.Ftp.DownloadFile;

        Stream reader = request.GetResponse().GetResponseStream();
        BinaryWriter writer = new BinaryWriter(File.Open(localDestinationFilePath, FileMode.CreateNew));

        while (true)
        {
            bytesRead = reader.Read(buffer, 0, buffer.Length);

            if (bytesRead == 0)
                break;

            writer.Write(buffer, 0, bytesRead);
        }        
    }

它使用我创造了这个CreateFtpWebRequest方式：

It uses this CreateFtpWebRequest method I created:

    private FtpWebRequest CreateFtpWebRequest(string ftpDirectoryPath, string userName, string password, bool keepAlive = false)
    {
        FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri(ftpDirectoryPath));

        //Set proxy to null. Under current configuration if this option is not set then the proxy that is used will get an html response from the web content gateway (firewall monitoring system)
        request.Proxy = null;

        request.UsePassive = true;
        request.UseBinary = true;
        request.KeepAlive = keepAlive;

        request.Credentials = new NetworkCredential(userName, password);

        return request;
    }

它下载它。但信息总是损坏。任何人都知道怎么回事？

It downloads it. But the information is always corrupted. Anyone know whats going on?

推荐答案

只要想通了：

    private void DownloadFile(string userName, string password, string ftpSourceFilePath, string localDestinationFilePath)
    {
        int bytesRead = 0;
        byte[] buffer = new byte[2048];

        FtpWebRequest request = CreateFtpWebRequest(ftpSourceFilePath, userName, password, true);
        request.Method = WebRequestMethods.Ftp.DownloadFile;

        Stream reader = request.GetResponse().GetResponseStream();
        FileStream fileStream = new FileStream(localDestinationFilePath, FileMode.Create);

        while (true)
        {
            bytesRead = reader.Read(buffer, 0, buffer.Length);

            if (bytesRead == 0)
                break;

            fileStream.Write(buffer, 0, bytesRead);
        }
        fileStream.Close();       
    }

只好用一个FileStream代替。

Had to use a FileStream instead.

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