Re: Newcomer's CAsyncSocket example: trouble connecting with other clients

From:
stephen park <steebu@gmail.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Thu, 13 May 2010 12:09:25 -0700 (PDT)
Message-ID:
<5e64be92-fc44-4e1b-978b-9c5ba71dd1d2@t26g2000prt.googlegroups.com>

I don't know what Joe's program is, but the above is correct when you
are talking to a telnet-like like server. I have no reason to
question Joe's CAsyncServer, but I have not try it to see what it
suppose to do for you.

What part are you trying to make work? What are you looking for?

What I would do is begin with the basics of writing a TTY client. If
you are just learning sockets, you need to begin with the
basics, which comes with "mistakes" and trial and error process.

Try this TTY() function:

void tty(String ^hostname, int port)
{

    Console::WriteLine("* Connecting");

    TcpClient^ c;

    try {
        c = gcnew TcpClient(hostname,port);
    } catch(SocketException ^e) {
        Console::WriteLine(L"- Connect Error {0}",e->ErrorCode);
        Console::ReadKey();
        return;
    }

    // use 100ms timeout for reader
    c->Client->ReceiveTimeout = 100;

    array<Byte>^ bytes = gcnew array<Byte>(1024);
    NetworkStream ^cio = c->GetStream();

    while (1) {
        if (Console::KeyAvailable) {
            ConsoleKeyInfo^ key = Console::ReadKey(true);
            if (key->Key == ConsoleKey::Escape) break;
            try {
                cio->WriteByte(key->KeyChar);
            } catch( Exception ^e) {
                break;
            }
        }
        try {
            int nBytes = c->Client->Receive( bytes );
            for (int i=0; i < nBytes; i++) {
                Console::Write("{0}",(wchar_t)bytes[i]);
            }
        } catch( SocketException ^e) {
            if (e->ErrorCode == 10054) {
                Console::WriteLine(L"! Disconnect");
                break;
            }
        }
    }
    c->Close();
    Console::WriteLine("* Closed");
    Console::ReadKey();

}


Interesting - this code doesn't work either. Dr. Newcomer's server
says it got a connection, but when I type stuff in nothing gets sent.
I can CTRL-C and then the server says its disconnected. Sooo ...
apparently nothing is getting sent?

I did try calling the .net versions of shutdown() and the
NetworkStream class even has a flush() function, although the doc says
that its reserved for future use. I called it anyway in my code but
still nothing got sent.

Interestingly enough, if I try telnetting to Dr. Newcomer's server I
get the same result as the tty code above - it says its connected, but
nothing gets sent? I could type stuff in, then hit Ctrl-D, Ctrl-G,
whatever Ctrl combo that might hopefully say I'm done sending stuff,
but nothing goes ...

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