Can anybody help me in a ftp program?

[fjlpf]

Hi

I am a beginner of programming. These days, I try to
develop a ftp program. But I find it is harder than I
have thought.
I want to post my code, then concentrate on resolving
the multithread problem and the communication problem
between the client and the server.

Can anybody help me or just join the discussion?

[Peter Koen]

"fjlpf" <an*******@disc ussions.microso ft.com> wrote in news:054a01c3ac 35
$0************* ***@phx.gbl:

Hi

I am a beginner of programming. These days, I try to
develop a ftp program. But I find it is harder than I
have thought.
I want to post my code, then concentrate on resolving
the multithread problem and the communication problem
between the client and the server.

Can anybody help me or just join the discussion?

Well, start with some palpable question and we will be able to help you...

cheers,
Peter

--
------ooo---OOO---ooo------

Peter Koen - www.kema.at
MCAD CAI/RS CASE/RS IAT

------ooo---OOO---ooo------

[Konrad Neitzel]

Hi "fjlpf",

(Your parents really gave you that name? :) )

"fjlpf" <an*******@disc ussions.microso ft.com> schrieb im Newsbeitrag
news:05******** *************** *****@phx.gbl.. .

I am a beginner of programming. These days, I try to
develop a ftp program. But I find it is harder than I
have thought.
I want to post my code, then concentrate on resolving
the multithread problem and the communication problem
between the client and the server.

As Peter told you already: Ask a question and maybe we could answer it.

And: Please go to google and search a little. Or simply go to
http://www.codeproject.com/csharp/

There you find a lot of stuff about ftp and c#.

Some small examples are:
FTP Component in C# for .NET:
http://www.codeproject.com/csharp/ftp.asp
FTP client library for C#:
http://www.codeproject.com/csharp/ftplibrary.asp
Application for uploading modified Files to a FTP Server
http://www.codeproject.com/csharp/net_ftp_upload.asp

With kind regards,

Konrad

Here is my code of ftp server. And I just extract the
implement of the function of transfering files.
I know it is very awful, so I am here to asked for your
help.

namespace FtpSrvr
{
public class Form1 : System.Windows. Forms.Form
{
private bool srv = true;
private IPAddress ipAddr;
private IPEndPoint ipEP;
public Socket sock_accpt;//port 20
public Socket sock_daccpt;//port 21
private Thread thrd_accpt;//a thread to accept connection
private Thread thrd_Daccpt;

public int total =0;

..........

[STAThread]
static void Main()
{Application.Ru n(new Form1()); }
............... .

private void btStartSrvr_Cli ck(object sender,
System.EventArg s e)
{
this.btStartSrv r.Enabled = false;
ipAddr = IPAddress.Parse ("127.0.0.1" );
IPEndPoint ipEP1 = new IPEndPoint(ipAd dr,20);
sock_accpt = new Socket
(AddressFamily. InterNetwork,So cketType.Stream ,ProtocolType.
Tcp);
sock_accpt.Bind ((EndPoint)ipEP 1);
sock_accpt.List en(5);
//
IPEndPoint ipEP2 = new IPEndPoint(ipAd dr,21);
sock_daccpt = new Socket
(AddressFamily. InterNetwork,So cketType.Stream ,ProtocolType.
Tcp);
sock_daccpt.Bin d((EndPoint)ipE P2);
sock_daccpt.Lis ten(5);

//create new thread to accept connection
thrd_Accpt = new Thread(new ThreadStart(thi s.Thrd_Accpt));
thrd_Accpt.Star t();

}
private void Thrd_Accpt()
{
while(srv)//
{ Socket newClient = sock_accpt.Acce pt();

ThreadStartComm and c = new ThreadStartComm and
(newClient,this .sock_daccpt);

Thread thrd = new Thread(new ThreadStart(c.T hrd_Command));
thrd.Start();
}
}

internal class ThreadStartComm and
{
private Socket _sock;//store the socket created by accept()
private Form1 _form;

public ThreadStartComm and(Socket sock, Form1 form
{ _sock = sock;
_form = form;
}

//this function aims to retrevie command
public void Thrd_Command()
{
_sock.SetSocket Option
(SocketOptionLe vel.Socket,Sock etOptionName.Se ndTimeout,5000
);

byte[] b= System.Text.Enc oding.ASCII.Get Bytes("welcome to
my ftp server");

try
{
_sock.Send(b,0, b.Length,Socket Flags.None);
}
catch(SocketExc eption ex)
{
System.Diagnost ics.Debug.Write ("error to send welcome
message" );
return;
}
_sock.SetSocket Option
(SocketOptionLe vel.Socket,Sock etOptionName.Re ceiveTimeout,2
0000);

byte[] buffer = new byte[1024];
int rcv ;
while(true)
{
try
{
rcv = _sock.Receive(b uffer,0,1024,So cketFlags.None) ;
}
catch(SocketExc eption ex)
{
/*if the client doesn't send command within 20 seconds,the
socket will close.*/

_sock.Close();
return
}
}

string s = System.Text.Enc oding.ASCII.Get String
(buffer,0,rcv);
s = s.ToLower();
int i = s.IndexOf(" ");
string comCode = s.Substring(0,i );
string para = s.Substring(i+1 ,rcv-1-i);
AnalyseCommand( comCode,para);
byte[] buffer = ASCII.GetBytes( "120 new port allocated");
_sock.Send(buff er,0,buffer.Len gth,SocketFlags .None);
}
}

public void AnalyseCommand( string comCode, string para)
{
switch(comCode)
{
case "retr":
{
lock(this._form .sock_daccpt)//
{if(this._form. total<4)
this._form.tota l++;//restrict total connection of Port 21
else
{byte[] buf = System.Text.Enc oding.ASCII.Get Bytes("sorry,
overload");
this._sock.Send (buf,0,buf.Leng th,SocketFlags. None);
return;
}
}
Thread thrd = new Thread(new ThreadStart
(this.ThrdSndFi le));

thrd.Start();// thread to transfer file to client
}
break;
}
case "":...

case "":...
}
}

public void ThrdSndFile(Soc ket accpt, string para)
{
Socket dataclient = this._form.sock _daccpt.Accept( );
FileStream fs;
try
{
fs = new FileStream
(@para,FileMode .Open,FileAcces s.Read,FileShar e.Read);
}
catch(IOExcepti on ex)
{dataclient.Clo se();
return;
}

dataclient.SetS ocketOption
(SocketOptionLe vel.Socket,Sock etOptionName.Se ndTimeout,5000
0);
int rd = 1;

while(rd!=0)
{
//Question:if the client socket collapse, what happen to
//socket of server, does it still push data to TCP's buffer
byte[] buffer = new byte[1024];
rd = fs.Read(buffer, 0,1024);

try
{_sock.Send(buf fer,0,rd,Socket Flags.None);
}
catch(SocketExc eption ex)
{
lock(this._form ._sock_daccpt)
{ this._form.tota l--;
}
_sock.Close();
return;
}
}
}

_sock.Close();
}
}
}

[fjlpf]

:)
konrad,
my parents' taste isn't awful like me.

with kind regards

[Konrad Neitzel]

Hi!

"fjlpf" <an*******@disc ussions.microso ft.com> schrieb im Newsbeitrag
news:05******** *************** *****@phx.gbl.. .

:)
konrad,
my parents' taste isn't awful like me.

Then everything is ok for me. I hope, my links helped a little.

With kind regards,

Konrad