连接ftp服务器 并且用listview控件读取服务器资源

//调用API 

public class Win32
        {
            public const uint SHGFI_ICON = 0x100;
            public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
            public const uint SHGFI_SMALLICON = 0x1; // 'Small icon
            [DllImport("shell32.dll", EntryPoint = "ExtractIcon")]
            public static extern int ExtractIcon(IntPtr hInst, string lpFileName, int nIndex);
            [DllImport("shell32.dll", EntryPoint = "SHGetFileInfo")]
            public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttribute, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint Flags);
            [DllImport("User32.dll", EntryPoint = "DestroyIcon")]
            public static extern int DestroyIcon(IntPtr hIcon);
            [DllImport("shell32.dll")]
            public static extern uint ExtractIconEx(string lpszFile, int nIconIndex, int[] phiconLarge, int[] phiconSmall, uint nIcons);
            [StructLayout(LayoutKind.Sequential)]
            public struct SHFILEINFO
            {
                public IntPtr hIcon;
                public IntPtr iIcon;
                public uint dwAttributes;
                [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
                public string szDisplayName;
                [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
                public string szTypeName;
            }         

public string FolderName="";
        private string serverIp;//ftp地址
        private string serverUser;//登录名
        private string serverPwd;//登录密码
        private static bool check=false;

private void toolStripButton1_Click(object sender, EventArgs e)//按钮事件   登录FTP 
        {
            try
            {
                        if (bc.CheckFtp(tstbHost.Text.Trim(), tstbUser.Text.Trim(), tstbPwd.Text.Trim()))
                        {
                            serverIp = tstbHost.Text.Trim();
                            serverUser = tstbUser.Text.Trim();
                            serverPwd = tstbPwd.Text.Trim();
                            tabControl2.TabPages[0].Text = "FTP服务器(" + tstbHost.Text.Trim() + ")";
                            listView2.Items.Clear();
                            bc.getFTPServerICO(imageList2, tstbHost.Text.Trim(), tstbUser.Text.Trim(), tstbPwd.Text.Trim(), listView2, "");
                            contextMenuStrip1.Items[0].Enabled = true;
                            this.Text = "HappyTime FTP V1.0-[" + tstbHost.Text + ",状态：已连接]";
                            toolStripStatusLabel3.Text = "[当前登录用户" + tstbUser.Text.Trim() + "]";

                            tscbServer.Items.Add("/" + tstbUser.Text.Trim());
                            tscbServer.SelectedIndex = 0;
                            check = true;
                        }
                        else
                        {
                            MessageBox.Show("FTP登录失败，请检查用户名和密码是否正确", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            this.Text = "HappyTime FTP V1.0-[" + tstbHost.Text + ",状态：连接失败]";
                            toolStripStatusLabel3.Text = "";
                        }
            }
            catch
            {

            }
        }

       //检查通讯情况

        FtpWebRequest reqFTP;
        public bool CheckFtp(string DomainName, string FtpUserName, string FtpUserPwd)//验证登录用户是否合法
        {
            bool ResultValue = true;
            try
            {
                FtpWebRequest ftprequest = (FtpWebRequest)WebRequest.Create("ftp://" + DomainName);//创建FtpWebRequest对象
                ftprequest.Credentials = new NetworkCredential(FtpUserName, FtpUserPwd);//设置FTP登陆信息
                ftprequest.Method = WebRequestMethods.Ftp.ListDirectory;//发送一个请求命令
                FtpWebResponse ftpResponse = (FtpWebResponse)ftprequest.GetResponse();//响应一个请求
                ftpResponse.Close();//关闭请求
            }
            catch
            {
                ResultValue = false;
            }
            return ResultValue;
        }

//获取服务器的图标

 public void getFTPServerICO(ImageList il,string ftpip,string  user,string  pwd,ListView lv,string path)
        {
            try
            {
                string[] a;
                lv.Items.Clear();
                il.Images.Clear();
                if(path.Length==0)
                    a = GetFileList(ftpip, user, pwd);
                else
                    a= GetFileList(ftpip + "/" + path.Remove(path.LastIndexOf("/")), user, pwd);
                if (a != null)
                {
                    for (int i = 0; i < a.Length; i++)
                    {
                       
                        string[] b = a[i].ToString().Split(' ');
                        string filename = b[b.Length-1];
                        string filetype="";
                        if (a[i].IndexOf("DIR") != -1)
                        {
                            filetype = filename;
                        }
                        else
                        {
                            filetype = filename.Substring(filename.LastIndexOf("."), filename.Length - filename.LastIndexOf("."));
                        }
                        il.Images.Add(GetIconByFileType(filetype, true));
                        string[] info = new string[4];
                        FileInfo fi = new FileInfo(filename);
                        info[0] = fi.Name;
                        info[1] = GetFileSize(filename, ftpip, user, pwd, path).ToString();
                        if (a[i].IndexOf("DIR") != -1)
                        {
                            info[2] = "";
                            info[1] = "文件夹";
                        }
                        else
                        {
                            info[2] = GetFileSize(filename, ftpip, user, pwd, path).ToString();
                            info[1] = fi.Extension.ToString();
                        }
                        ListViewItem item = new ListViewItem(info, i);
                        lv.Items.Add(item);
                    }
                }
            }
            catch{}
        }

        //从ftp服务器上获得文件列表

        public string[] GetFileList(string ftpServerIP, string ftpUserID, string ftpPassword)
        {
            string[] downloadFiles;
            StringBuilder result = new StringBuilder();
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP));
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("GB2312"));
                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = reader.ReadLine();
                   
                }
                result.Remove(result.ToString().LastIndexOf('\n'), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch
            {
                downloadFiles = null;
                return downloadFiles;
            }
        }

//获取ftp文件的长度

        public long GetFileSize(string filename, string ftpserver,string ftpUserID, string ftpPassword,string path)
        {
            long filesize = 0;
            try
            {
                FileInfo fi = new FileInfo(filename);
                string uri;
                if(path.Length==0)
                    uri = "ftp://" + ftpserver + "/" + fi.Name;
                else
                    uri = "ftp://" + ftpserver + "/" +path+ fi.Name;
                Connect(uri, ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                filesize = response.ContentLength;
                return filesize;
            }
            catch
            {
                return 0;
            }
        }

 

        /// 给出文件扩展名（.*），返回相应图标
        /// 若不以"."开头则返回文件夹的图标。
        public Icon GetIconByFileType(string fileType,bool isLarge)
        {
            if(fileType == null || fileType.Equals(string.Empty)) return null;
            RegistryKey regVersion = null;
            string regFileType = null;
            string regIconString = null;
            string systemDirectory = Environment.SystemDirectory + "\\";
            if(fileType[0] == '.')
            {
                //读系统注册表中文件类型信息
                regVersion = Registry.ClassesRoot.OpenSubKey(fileType, true);
                if(regVersion != null)
                {
                    regFileType = regVersion.GetValue("") as string;
                    regVersion.Close();
                    regVersion = Registry.ClassesRoot.OpenSubKey(regFileType + @"\DefaultIcon" , true);
                    if(regVersion != null)
                    {
                        regIconString = regVersion.GetValue("") as string;
                        regVersion.Close();
                    }
                }
                if(regIconString == null)
                {
                    //没有读取到文件类型注册信息，指定为未知文件类型的图标
                    regIconString = systemDirectory +"shell32.dll,0";
                }
            }
            else
            {
                //直接指定为文件夹图标
                regIconString = systemDirectory +"shell32.dll,3";
            }
            string[] fileIcon = regIconString.Split(new char[]{','});
            if(fileIcon.Length != 2)
            {
                //系统注册表中注册的标图不能直接提取，则返回可执行文件的通用图标
                fileIcon = new string[]{systemDirectory +"shell32.dll","2"};
            }
            Icon resultIcon = null;
            try
            {
                //调用API方法读取图标
                int[] phiconLarge = new int[1];
                int[] phiconSmall = new int[1];
                uint count = Win32.ExtractIconEx(fileIcon[0],Int32.Parse(fileIcon[1]),phiconLarge,phiconSmall,1);
                IntPtr IconHnd = new IntPtr(isLarge?phiconLarge[0]:phiconSmall[0]);
                resultIcon = Icon.FromHandle(IconHnd);
            }

            catch
            {
                fileIcon = new string[] { systemDirectory + "shell32.dll", "2" };
                                //调用API方法读取图标
                int[] phiconLarge = new int[1];
                int[] phiconSmall = new int[1];
                uint count = Win32.ExtractIconEx(fileIcon[0],Int32.Parse(fileIcon[1]),phiconLarge,phiconSmall,1);
                IntPtr IconHnd = new IntPtr(isLarge?phiconLarge[0]:phiconSmall[0]);
                resultIcon = Icon.FromHandle(IconHnd);
            }
            return resultIcon;
        }