C# 如何获取FTP夹内的文件路径

Question

请问在winform里怎样才能连接到FTP，并获取文件路径。例如：ftp地址是：ftp://192.168.1.1/ 用户名是admin 密码是111 。登录FTP后，我选择了一个文件：picture.jpg 请问我怎样才能打开FTP目录，并且获得我鼠标选取的文件的FTP路径：ftp://192.168.1.1/picture.jpg ，感谢您的解答。

Answer 1

你是想通过FTP地址获取到FTP部署的本地路径，如把ftp://192.168.1.1/picture.jpg换成D:\FTP\picture.jpg,这个受FTP安全限制是无法获取的，FTP部署在服务器上面，就算获取到了实际路径你也没法操作，部署在本地这样获取就没什么意义了。
下面提供FTP的上传和下载的两个方法，供参考：
private bool UploadFileByFtpWebRequest(string fileName, string ftpServerIP, string path, string userName, string password)
{
bool result = true;
string url = string.Format("ftp://{0}:{1}/{2}", ftpServerIP, path, fileName.Substring(fileName.LastIndexOf(@"\") + 1));

        FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
        request.UseBinary = true;
        request.Credentials = new NetworkCredential(userName, password);
        request.Method = WebRequestMethods.Ftp.UploadFile;
        Stream stream = request.GetRequestStream();
        FileStream fileStream = new FileStream(fileName, FileMode.Open);
        int packageSize = 1024 * 1024;
        int packageCount = (int)(fileStream.Length / packageSize);
        int rest = (int)(fileStream.Length % packageSize);

        for (int index = 0; index < packageCount; index++)
        {
            byte[] buffer = new byte[packageSize];
            fileStream.Read(buffer, 0, buffer.Length);
            stream.Write(buffer, 0, buffer.Length);
            this.pgbShow.Value = buffer.Length / (int)fileStream.Length * 100;
            //this.lblLeng.Text = pgbShow.Value.ToString();
            lblLeng.Invoke(new myDelegate(delegate() 
                {
                    this.lblLeng.Text = pgbShow.Value.ToString() + "%";
                }));


        }
        if (rest != 0)
        {
            byte[] buffer = new byte[rest];
            fileStream.Read(buffer, 0, buffer.Length);
            stream.Write(buffer, 0, buffer.Length);
            this.BeginInvoke(new DoSomething(delegate()
            {
                //if (rest != 0) this.pgbShow.Maximum += 1;
                this.pgbShow.Value = 100;
            }));
        }
        stream.Close();
        fileStream.Close();
        this.BeginInvoke(new DoSomething(delegate()
        {
            //this.pgbShow.Value = 0;
        }));
        return result;
    }

    public string Download(string userId, string pwd, string ftpPath, string filePath, string fileName)
    {
        string sRet = "下载成功！";
        FtpWebRequest reqFTP;
        try
        {
            FileStream outputStream = new FileStream(filePath + fileName, FileMode.Create);

            // 根据uri创建FtpWebRequest对象     
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath + fileName));

            // 指定执行什么命令    
            reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

            // 指定数据传输类型    
            reqFTP.UseBinary = true;
            reqFTP.UsePassive = false;

            // ftp用户名和密码    
            reqFTP.Credentials = new NetworkCredential(userId, pwd);

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

            // 把下载的文件写入流  
            Stream ftpStream = response.GetResponseStream();

            long cl = response.ContentLength;

            // 缓冲大小设置为2kb    
            int bufferSize = 2048;
            int readCount;
            byte[] buffer = new byte[bufferSize];

            // 每次读文件流的2kb    
            readCount = ftpStream.Read(buffer, 0, bufferSize);
            while (readCount > 0)
            {
                // 把内容从文件流写入     
                outputStream.Write(buffer, 0, readCount);
                readCount = ftpStream.Read(buffer, 0, bufferSize);
            }

            //关闭两个流和ftp连接  
            ftpStream.Close();
            outputStream.Close();
            response.Close();


        }
        catch (Exception ex)
        {
            sRet = ex.Message;
        }

        //返回下载结果（是否下载成功）  
        return sRet;
    }