高分求助:我写了一段FTP上传的程序,但每当传文件的时候就会出现异常.请大家帮忙看看.

[cxyppppp]

public class FTP
{
private Socket cs;
private string remoteHost,remoteUser,remotePwd,remoteFilePath;
private int remotePort,bytes;
private bool logined;
private string replyCode,replyMess,fileName;
private byte[] buffer=new byte[1024];

public FTP()
{
}

/// <summary>
/// 属性：远程主机名称
/// </summary>
public string RemoteHost
{
get
{
return remoteHost;
}
set
{
remoteHost=value;
}
}
/// <summary>
/// 属性：用户名
/// </summary>
public string RemoteUser
{
get
{
return remoteUser;
}
set
{
remoteUser=value;
}
}

/// <summary>
/// 属性：登陆口令
/// </summary>
public string RemotePassword
{
get
{
return remotePwd;
}
set
{
remotePwd=value;
}
}
/// <summary>
/// 属性：Ftp端口号
/// </summary>
public int RemotePort
{
get
{
return remotePort;
}
set
{
remotePort=value;
}
}

/// <summary>
/// 属性：FTP文件目录
/// </summary>
public string RemoteFilePath
{
get
{
return remoteFilePath;
}
set
{
remoteFilePath=value;
}
}

/// <summary>
/// 属性：设置本地文件名与路径
/// </summary>
public string LocalFile
{
get
{
return fileName;
}
set
{
fileName=value;
}
}


/// <summary>
/// 登陆函数
/// </summary>
private void Login()
{

IPEndPoint ep=new IPEndPoint(Dns.Resolve(remoteHost).AddressList[0],remotePort);
cs=new Socket(ep.AddressFamily,SocketType.Stream,ProtocolType.Tcp);
try
{
cs.Connect(ep);
UserCheck();
PassCheck();
logined=true;
}
catch
{
logined=false;
CleanUp();
throw new IOException("Couldn't connect to the remote server.");
}
}

/// <summary>
/// Tcp发送命令
/// </summary>
/// <param name="strCommand"></param>
private void SendFtpCommand(string strCommand)
{
byte[] sendByte=System.Text.Encoding.ASCII.GetBytes((strCommand+"\r\n").ToCharArray());
cs.Send(sendByte,sendByte.Length,0);
}

/// <summary>
/// 读取响应结果
/// </summary>
private void ReadReply()
{
replyMess="";
replyCode=ReadReplyLine();
}

/// <summary>
/// 获取响应
/// </summary>
/// <returns></returns>
private string ReadReplyLine()
{
while(true)
{
int byteCount=cs.Receive(buffer,buffer.Length,0);
replyMess+=Encoding.ASCII.GetString(buffer,0,byteCount);
if(byteCount<buffer.Length)
break;
}
string[] mess=replyMess.Split('\n');
if(mess.Length>2)
replyMess=mess[mess.Length-2];
else
replyMess=mess[0];
return replyMess.Substring(0,3);
}

/// <summary>
/// 检查用户名
/// </summary>
private void UserCheck()
{
SendFtpCommand("USER "+remoteUser);
ReadReply();
if(replyCode!="331"&&replyCode!="230")
{
CleanUp();
throw new Exception("Error user!");
}
}
/// <summary>
/// 口令检查
/// </summary>
private void PassCheck()
{
SendFtpCommand("PASS "+remotePwd);
ReadReply();
if(replyCode!="202"&&replyCode!="230")
{
CleanUp();
throw new Exception("Error password!");
}
}


/// <summary>
/// 保存文件
/// </summary>
private void StoreFile()
{
SendFtpCommand("STOR "+remoteFilePath);
ReadReply();
if(replyCode!="125"&&replyCode!="150")
{
CleanUp();
throw new Exception("Prepare failure!");
}
FileStream stream=new FileStream(fileName,FileMode.Open,FileAccess.Read);
while((bytes=stream.Read(buffer,0,buffer.Length))!=0)
{
cs.Send(buffer,bytes,0);
}
string fileEnd="<EOF>";
byte[] byt=new byte[1024];
byt=System.Text.Encoding.ASCII.GetBytes(fileEnd.ToCharArray());
cs.Send(byt,byt.Length,0);
stream.Close();
ReadReply();

if(replyCode!="226"&&replyCode!="250")
{
CleanUp();
throw new Exception("Transfer error!");
}
QuitFtp();
cs.Close();
CleanUp();
}

private void QuitFtp()
{
SendFtpCommand("QUIT");
}

private void CleanUp()
{
if(cs.Connected)
cs.Close();
cs=null;
logined=false;
}

/// <summary>
/// 上传文件
/// </summary>
public void FtpFile()
{
Login();
if(logined)
{
StoreFile();
}
}
}

以上是我写的一个简单的FTP上传程序,目的是要传到远程的FTP主机上,但调试时发现
每次开始传文件时,就是在发送STOR命令之后的这一段程序
FileStream stream=new FileStream(fileName,FileMode.Open,FileAccess.Read);
while((bytes=stream.Read(buffer,0,buffer.Length))!=0)
{
cs.Send(buffer,bytes,0);
}
string fileEnd="<EOF>";
byte[] byt=new byte[1024];
byt=System.Text.Encoding.ASCII.GetBytes(fileEnd.ToCharArray());
cs.Send(byt,byt.Length,0);
stream.Close();
通过ReadReply()函数,得到返回的响应码为425,说Can't open data connection.
但STOR命令得到的响应码为150,说明数据连接已经打开.
请CSDN上的朋友们帮我看看.谢谢

[killprograme]

参照
http://www.c-sharpcorner.com/Code/2003/April/FtpClient.asp

[ETstudio]

up

[acewang]

gz

[wacle]

mark.

[fisheren]

xx

[仙人掌]

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

namespace GetQx
{

public class ftpc
{

private string remoteHost,remotePath,remoteUser,remotePass,mes;
private int remotePort,bytes;
private Socket clientSocket;

private int retValue;
private Boolean debug;
private Boolean logined;
private string reply;

private static int BLOCK_SIZE = 512;

Byte[] buffer = new Byte[BLOCK_SIZE];
Encoding ASCII = Encoding.ASCII;

public ftpc()
{

remoteHost = "127.0.0.1";
remotePath = ".";
remoteUser = "anonymous";
remotePass = "[e-mail]";
remotePort = 21;
debug = false;
logined = false;

}

///
/// Set the name of the FTP server to connect to.
///
/// Server name
public void setRemoteHost(string remoteHost)
{
this.remoteHost = remoteHost;
}

///
/// Return the name of the current FTP server.
///
/// Server name
public string getRemoteHost()
{
return remoteHost;
}

///
/// Set the port number to use for FTP.
///
/// Port number
public void setRemotePort(int remotePort)
{
this.remotePort = remotePort;
}

///
/// Return the current port number.
///
/// Current port number
public int getRemotePort()
{
return remotePort;
}

///
/// Set the remote directory path.
///
/// The remote directory path
public void setRemotePath(string remotePath)
{
this.remotePath = remotePath;
}

///
/// Return the current remote directory path.
///
/// The current remote directory path.
public string getRemotePath()
{
return remotePath;
}

///
/// Set the user name to use for logging into the remote server.
///
/// Username
public void setRemoteUser(string remoteUser)
{
this.remoteUser = remoteUser;
}

///
/// Set the password to user for logging into the remote server.
///
/// Password
public void setRemotePass(string remotePass)
{
this.remotePass = remotePass;
}

///
/// Return a string array containing the remote directory's file list.
///
///
///
public string[] getFileList(string mask)
{

if(!logined)
{
login();
}

Socket cSocket = createDataSocket();

sendCommand("NLST " + mask);

if(!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}

mes = "";

while(true)
{

int bytes = cSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);

if(bytes < buffer.Length)
{
break;
}
}

char[] seperator = {'\n'};
string[] mess = mes.Split(seperator);

cSocket.Close();

readReply();

if(retValue != 226)
{
throw new IOException(reply.Substring(4));
}
return mess;

}

///
/// Return the size of a file.
///
///
///
public long getFileSize(string fileName)
{

if(!logined)
{
login();
}

sendCommand("SIZE " + fileName);
long size=0;

if(retValue == 213)
{
size = Int64.Parse(reply.Substring(4));
}
else
{
throw new IOException(reply.Substring(4));
}

return size;

}

///
/// Login to the remote server.
///
public void login()
{

clientSocket = new
Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
IPEndPoint ep = new
IPEndPoint(Dns.Resolve(remoteHost).AddressList[0], remotePort);

try
{
clientSocket.Connect(ep);
}
catch(Exception)
{
throw new IOException("连接服务器超时,请重新连接！");
}

readReply();
if(retValue != 220)
{
close();
throw new IOException(reply.Substring(4));
}
if(debug)
Console.WriteLine("USER "+remoteUser);

sendCommand("USER "+remoteUser);

if( !(retValue == 331 || retValue == 230) )
{
cleanup();
throw new IOException(reply.Substring(4));
}

if( retValue != 230 )
{
if(debug)
Console.WriteLine("PASS xxx");

sendCommand("PASS "+remotePass);
if( !(retValue == 230 || retValue == 202) )
{
cleanup();
throw new IOException(reply.Substring(4));
}
}

logined = true;
//Console.WriteLine("Connected to "+remoteHost);

chdir(remotePath);

}

///
/// If the value of mode is true, set binary mode for downloads.
/// Else, set Ascii mode.
///
///
public void setBinaryMode(Boolean mode)
{

if(mode)
{
sendCommand("TYPE I");
}
else
{
sendCommand("TYPE A");
}
if (retValue != 200)
{
throw new IOException(reply.Substring(4));
}
}

///
/// Download a file to the Assembly's local directory,
/// keeping the same file name.
///
///
public void download(string remFileName)
{
download(remFileName,"",false);
}

///
/// Download a remote file to the Assembly's local directory,
/// keeping the same file name, and set the resume flag.
///
///
///
public void download(string remFileName,Boolean resume)
{
download(remFileName,"",resume);
}

///
/// Download a remote file to a local file name which can include
/// a path. The local file name will be created or overwritten,
/// but the path must exist.
///
///
///
public void download(string remFileName,string locFileName)
{
download(remFileName,locFileName,false);
}

///
/// Download a remote file to a local file name which can include
/// a path, and set the resume flag. The local file name will be
/// created or overwritten, but the path must exist.
///
///
///
///
public void download(string remFileName,string
locFileName,Boolean resume)
{
if(!logined)
{
login();
}

setBinaryMode(true);

//Console.WriteLine("Downloading file "+remFileName+" from "+remoteHost + "/"+remotePath);

if (locFileName.Equals(""))
{
locFileName = remFileName;
}

if(!File.Exists(locFileName))
{
Stream st = File.Create(locFileName);
st.Close();
}

FileStream output = new
FileStream(locFileName,FileMode.Open);

Socket cSocket = createDataSocket();

long offset = 0;

if(resume)
{

offset = output.Length;

if(offset > 0 )
{
sendCommand("REST "+offset);
if(retValue != 350)
{
//throw new IOException(reply.Substring(4));
//Some servers may not support resuming.
offset = 0;
}
}

if(offset > 0)
{
if(debug)
{
Console.WriteLine("seeking to " + offset);
}
long npos = output.Seek(offset,SeekOrigin.Begin);
// Console.WriteLine("new pos="+npos);
}
}

sendCommand("RETR " + remFileName);

if(!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}

while(true)
{

bytes = cSocket.Receive(buffer, buffer.Length, 0);
output.Write(buffer,0,bytes);

if(bytes <= 0)
{
break;
}
}

output.Close();
if (cSocket.Connected)
{
cSocket.Close();
}

//Console.WriteLine("");

readReply();

if( !(retValue == 226 || retValue == 250) )
{
throw new IOException(reply.Substring(4));
}

}

[仙人掌]

///
/// Upload a file.
///
///
public void upload(string fileName)
{
upload(fileName,false);
}
///
/// Upload a file and set the resume flag.
///
///
///
public void upload(string fileName,Boolean resume)
{

if(!logined)
{
login();
}

Socket cSocket = createDataSocket();
long offset=0;

if(resume)
{

try
{

setBinaryMode(true);
offset = getFileSize(fileName);

}
catch(Exception)
{
offset = 0;
}
}

if(offset > 0 )
{
sendCommand("REST " + offset);
if(retValue != 350)
{
//throw new IOException(reply.Substring(4));
//Remote server may not support resuming.
offset = 0;
}
}

sendCommand("STOR "+Path.GetFileName(fileName));

if( !(retValue == 125 || retValue == 150) )
{
throw new IOException(reply.Substring(4));
}

// open input stream to read source file
FileStream input = new
FileStream(fileName,FileMode.Open);

if(offset != 0)
{

if(debug)
{
Console.WriteLine("seeking to " + offset);
}
input.Seek(offset,SeekOrigin.Begin);
}

//Console.WriteLine("Uploading file "+fileName+" to "+remotePath);

while ((bytes = input.Read(buffer,0,buffer.Length)) > 0)
{

cSocket.Send(buffer, bytes, 0);

}
input.Close();

//Console.WriteLine("");

if (cSocket.Connected)
{
cSocket.Close();
}

readReply();
if( !(retValue == 226 || retValue == 250) )
{
throw new IOException(reply.Substring(4));
}
}

///
/// Delete a file from the remote FTP server.
///
///
public void deleteRemoteFile(string fileName)
{

if(!logined)
{
login();
}

sendCommand("DELE "+fileName);

if(retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

///
/// Rename a file on the remote FTP server.
///
///
///
public void renameRemoteFile(string oldFileName,string
newFileName)
{

if(!logined)
{
login();
}

sendCommand("RNFR "+oldFileName);

if(retValue != 350)
{
throw new IOException(reply.Substring(4));
}

// known problem
// rnto will not take care of existing file.
// i.e. It will overwrite if newFileName exist
sendCommand("RNTO "+newFileName);
if(retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

///
/// Create a directory on the remote FTP server.
///
///
public void mkdir(string dirName)
{

if(!logined)
{
login();
}

sendCommand("MKD "+dirName);

if(retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

///
/// Delete a directory on the remote FTP server.
///
///
public void rmdir(string dirName)
{

if(!logined)
{
login();
}

sendCommand("RMD "+dirName);

if(retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

///
/// Change the current working directory on the remote FTP server.
///
///
public void chdir(string dirName)
{

if(dirName.Equals("."))
{
return;
}

if(!logined)
{
login();
}

sendCommand("CWD "+dirName);

if(retValue != 250)
{
throw new IOException(reply.Substring(4));
}

this.remotePath = dirName;

//Console.WriteLine("Current directory is "+remotePath);

}

///
/// Close the FTP connection.
///
public void close()
{

if( clientSocket != null )
{
sendCommand("QUIT");
}

cleanup();
//Console.WriteLine("Closing...");
}

///
/// Set debug mode.
///
///
public void setDebug(Boolean debug)
{
this.debug = debug;
}

private void readReply()
{
mes = "";
reply = readLine();
retValue = Int32.Parse(reply.Substring(0,3));
}

private void cleanup()
{
if(clientSocket!=null)
{
clientSocket.Close();
clientSocket = null;
}
logined = false;
}

private string readLine()
{

while(true)
{
bytes = clientSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);
if(bytes < buffer.Length)
{
break;
}
}

char[] seperator = {'\n'};
string[] mess = mes.Split(seperator);

if(mes.Length > 2)
{
mes = mess[mess.Length-2];
}
else
{
mes = mess[0];
}

if(!mes.Substring(3,1).Equals(" "))
{
return readLine();
}

if(debug)
{
for(int k=0;k < mess.Length-1;k++)
{
Console.WriteLine(mess[k]);
}
}
return mes;
}

private void sendCommand(String command)
{

Byte[] cmdBytes = Encoding.Default.GetBytes((command+"\r\n").ToCharArray());
clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
readReply();
}

private Socket createDataSocket()
{

sendCommand("PASV");

if(retValue != 227)
{
throw new IOException(reply.Substring(4));
}

int index1 = reply.IndexOf('(');
int index2 = reply.IndexOf(')');
string ipData =
reply.Substring(index1+1,index2-index1-1);
int[] parts = new int[6];

int len = ipData.Length;
int partCount = 0;
string buf="";

for (int i = 0; i < len && partCount <= 6; i++)
{

char ch = Char.Parse(ipData.Substring(i,1));
if (Char.IsDigit(ch))
buf+=ch;
else if (ch != ',')
{
throw new IOException("Malformed PASV reply: " +
reply);
}

if (ch == ',' || i+1 == len)
{

try
{
parts[partCount++] = Int32.Parse(buf);
buf="";
}
catch (Exception)
{
throw new IOException("Malformed PASV reply: " +
reply);
}
}
}

string ipAddress = parts[0] + "."+ parts[1]+ "." +
parts[2] + "." + parts[3];

int port = (parts[4] << 8) + parts[5];

Socket s = new
Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
IPEndPoint ep = new
IPEndPoint(Dns.Resolve(ipAddress).AddressList[0], port);

try
{
s.Connect(ep);
}
catch(Exception)
{
throw new IOException("Can't connect to remote server");
}

return s;
}

}
}

[cxyppppp]

呵呵，这段代码我有.但我不需要那么多的功能,我只想知道,我的问题出在哪里?

[panyee]

好像要设置pasv
上传文件的格式是bin还是txt


你参照一下这的ftp库
http://www.c-sharpcorner.com/Code/2003/April/FtpClient.asp

[cxyppppp]

上传的文件为.dat文件,格式应该是bin

[cxyppppp]

PASV命令没有效果,每次传文件的时候返回的响应代码都是425. 郁闷啊!

[goody9807]

up

[cenxaoi]

gz

[windinwing]

FTP要二个Socket连接的，一个传输控制(21端口)，一个数据是连接中（随机，默认20）

--但STOR命令得到的响应码为150

好像是150表示服务器已准备好，并不表示数据连接已打开吧

　　　数据连接通过发送pasv　或者　port　来初始化一个端口和Socket
　　　　前者被动模式，服务器监听，后者客户端监听，　数据通过这个连接来传输的

[windinwing]

pasv的实现过程是这样的：端口21发送pasv到server，
接收回复信息的格式是（XX.XX.XX.XX.s5.s6)，
括号中的s5、s6是server通告的端口号，得出正确的断口用换算：
s5*256+s6

private string CreatePortParam()
{

string ip = this.m_pFTP_Server.IpAddress.ToString().Replace(".",",");
Random r = new Random();
int p1 = r.Next(1,100);
int p2 = r.Next(1,100);
m_ConnectedDataport = (p1 << 8) | p2;

return ip + "," + p1.ToString() + "," + p2.ToString();

}

[wacle]

FTP的实现的确是需要两个Socket连接的,数据连接和传输控制是两个通道.

[cxyppppp]

那我怎样打开数据连接呢>?难道还要再开一个和前面一模一样的Socket

[cxyppppp]

多谢wacle的私下交流,问题解决.给分