using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace CallCenter.Utility
{
    public class uploadFile
    {
        public string ftpPath;
        public string ftpUserID;
        public string ftpPassword;

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="fileinfo">需要上传的文件</param>
        public string UploadLocalToFtp(string localFile)
        {
            string res = "";
            if (!File.Exists(localFile))
            {
                res = "文件：“" + localFile + "” 不存在！";
                return res;
            }
            FileInfo fileInf = new FileInfo(localFile);
            string ftpURI = "ftp://" + ftpPath + "/";
            string uri = ftpURI + fileInf.Name;
            FtpWebRequest reqFTP;

            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));// 根据uri创建FtpWebRequest对象   
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);// ftp用户名和密码  
            reqFTP.KeepAlive = false;// 默认为true，连接不会被关闭 // 在一个命令之后被执行  
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;// 指定执行什么命令  
            reqFTP.UseBinary = true;// 指定数据传输类型  
            reqFTP.ContentLength = fileInf.Length;// 上传文件时通知服务器文件的大小  
            int buffLength = 2048;// 缓冲大小设置为2kb  
            byte[] buff = new byte[buffLength];
            int contentLen;

            // 打开一个文件流 (System.IO.FileStream) 去读上传的文件  
            FileStream fs = fileInf.OpenRead();
            try
            {
                Stream strm = reqFTP.GetRequestStream();// 把上传的文件写入流  
                contentLen = fs.Read(buff, 0, buffLength);// 每次读文件流的2kb  

                while (contentLen != 0)// 流内容没有结束  
                {
                    // 把内容从file stream 写入 upload stream  
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                // 关闭两个流  
                strm.Close();
                fs.Close();
                res = "上传成功！";
            }
            catch (Exception ex)
            {
                res = "上传文件【" + ftpPath + "/" + fileInf.Name + "】时，发生错误：" + ex.Message + "<br/>";
            }
            return res;
        }

        /// <summary>  
        /// 判断ftp服务器上该目录是否存在  
        /// </summary>  
        /// <param name="ftpPath">FTP路径目录</param>  
        /// <param name="dirName">目录上的文件夹名称</param>  
        /// <returns></returns>  
        private bool CheckDirectoryExist(string ftpPath, string dirName)
        {
            bool flag = true;
            try
            {
                //实例化FTP连接  
                FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpPath + dirName);
                ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                ftp.Method = WebRequestMethods.Ftp.ListDirectory;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception)
            {
                flag = false;
            }
            return flag;
        }

        /// <summary>  
        /// 创建文件夹    
        /// </summary>    
        /// <param name="ftpPath">FTP路径</param>    
        /// <param name="dirName">创建文件夹名称</param>    
        public void MakeDir(string ftpPath, string dirName)
        {
            FtpWebRequest reqFTP;
            try
            {
                string ui = (ftpPath + dirName).Trim();
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(ui);
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                ftpStream.Close();
                response.Close();
                //Response.Write("文件夹【" + dirName + "】创建成功！<br/>");
            }
            catch (Exception ex)
            {
                //Response.Write("新建文件夹【" + dirName + "】时，发生错误：" + ex.Message);
            }

        }
    }
}