using?System;
using?System.Net;
using?System.Net.Sockets;
using?System.Text;
using?System.IO;

namespace?FtpClient
{
????///?

????///?FTP?操作類
????///?

????public?class?FTP
????{
????????private?string?strRemoteHost;
????????private?int?strRemotePort;
????????private?string?strRemotePath;
????????private?string?strRemoteUser;
????????private?string?strRemotePass;
????????private?Boolean?bConnected;

????????#region?內(nèi)部變量
????????///?

????????///?服務(wù)器返回的應(yīng)答信息（包含應(yīng)答碼）
????????///?

????????private?string?strMsg;
????????///?

????????///?服務(wù)器返回的應(yīng)答信息（包含應(yīng)答碼）
????????///?

????????private?string?strReply;
????????///?

????????///?服務(wù)器返回的應(yīng)答碼
????????///?

????????private?int?iReplyCode;
????????///?

????????///?進(jìn)行控制連接的socket
????????///?

????????private?Socket?socketControl;
????????///?

????????///?傳輸模式
????????///?

????????private?TransferType?trType;
????????///?

????????///?傳輸模式:二進(jìn)制類型、ASCII類型
????????///?

????????public?enum?TransferType
????????{
????????????///?

????????????///?Binary
????????????///?

????????????Binary
????????????///?

????????????///?ASCII
????????????///?

????????????ASCII
????????};

????????///?

????????///?接收和發(fā)送數(shù)據(jù)的緩沖區(qū)
????????///?

????????private?static?int?BLOCK_SIZE?=?512;
????????Byte[]?buffer?=?new?Byte[BLOCK_SIZE];
????????///?

????????///?編碼方式
????????///?

????????Encoding?ASCII?=?Encoding.Default;
????????#endregion

????????#region?內(nèi)部函數(shù)

????????#region?構(gòu)造函數(shù)
????????///?

????????///?缺省構(gòu)造函數(shù)
????????///?

????????public?FTP（）
????????{
????????????strRemoteHost?=?““;
????????????strRemotePath?=?““;
????????????strRemoteUser?=?““;
????????????strRemotePass?=?““;
????????????strRemotePort?=?21;
????????????bConnected?=?false;
????????}

????????///?

????????///?構(gòu)造函數(shù)
????????///?

????????///?The?remote?host.
????????///?The?remote?path.
????????///?The?remote?user.
????????///?The?remote?pass.
????????///?The?remote?port.
????????public?FTP（string?remoteHost?string?remotePath?string?remoteUser?string?remotePass?int?remotePort）
????????{
????????????strRemoteHost?=?remoteHost;
????????????strRemotePath?=?remotePath;
????????????strRemoteUser?=?remoteUser;
????????????strRemotePass?=?remotePass;
????????????strRemotePort?=?remotePort;
????????????Connect（）;
????????}
????????///?

????????///?Initializes?a?new?instance?of?the??class.
????????///?

????????///?The?remote?host.
????????///?The?remote?path.
????????///?