Asynchronuous Socket handling

Posted on 2001-06-30
Last Modified: 2007-12-19
i am  working on an IRC Client...till now i am doing Synchronuous I/O...i mean for sending data i am using send() and for recieving data i am using recv() in a differnt is working all right but i want to change this to asynch stuff but cannt find any example...i want to handle send and recieve operations in a single thread Asynchronuously...any help will be greatly appreciated


Question by:newborn
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +1
LVL 30

Expert Comment

ID: 6240371
What OS, What compiler, What type of project???

Author Comment

ID: 6240377
Compiler:VC++ 6.0
An IRC Client,TCP/IP protocol,stream sockets
LVL 30

Expert Comment

ID: 6240380
Is the project an MFC, Win32-App, or Win32-Console?
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Author Comment

ID: 6240382
Win32 i said i am using send() and recv() API's no CSocket or ASyncSocket
LVL 32

Expert Comment

ID: 6240542
So what is your question?  If you're familiar with both blocking socket calls and with Windows message processing, you already understand this.  Rather than perform a network action when you call it the WINSOCK asynch calls queue the request and return to your app.  When the request completes (either sucessfully or with an error) your app will be sent a message about it.

I find that the best way to structure such a program is using a "state machine" to track the network operations as they progress.  This prevents having to have a separate message queue for each type of network event and therefore having to implement a bunch of global vars.
LVL 14

Expert Comment

ID: 6240551
see example of using asynchronously in
  Send Mail (socket 2) "Davide Libenzi"
LVL 14

Accepted Solution

AlexVirochovsky earned 50 total points
ID: 6261993
Next is snippet from Davide code:
int SvrConnectTimeout(SOCKET SockFD, const struct sockaddr * pSockName, int iNameLen,
                        int iTimeout)

    WSAEVENT        hConnectEvent;

    if ((hConnectEvent = WSACreateEvent()) == NULL)
        return (-1);

    WSAEventSelect(SockFD, hConnectEvent, FD_CONNECT);

    int iConnectResult = WSAConnect(SockFD, pSockName, iNameLen, NULL, NULL, NULL, NULL);

    int iConnectError = WSAGetLastError();

    if ((iConnectResult != 0) && (iConnectError == WSAEWOULDBLOCK))
        DWORD           dwWaitResult,
                        dwEntryCount = GetTickCount();

        while ((dwWaitResult = WSAWaitForMultipleEvents(1, &hConnectEvent, FALSE,
                                dwStepTimeout, TRUE)) != WSA_WAIT_EVENT_0)
            if (dwWaitResult == WSA_WAIT_FAILED)

            if ((iTimeout > 0) &&
                    ((iTimeout * 1000) < (int) (GetTickCount() - dwEntryCount)))

            if (CallIdleProc() < 0)
        iConnectResult = (dwWaitResult == WSA_WAIT_EVENT_0) ? 0 : -1;

    WSAEventSelect(SockFD, hConnectEvent, 0);

    return (iConnectResult);

Full project contens many such examples.
I hope, it helps. Alex

Author Comment

ID: 6262017
i have solved my prob , has very good samples i got my thing from wal,ur sample is also good,no need of window to recieve the call back notifications ,events can do, i will try to improve my code,many thanx for ur help

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Often, when implementing a feature, you won't know how certain events should be handled at the point where they occur and you'd rather defer to the user of your function or class. For example, a XML parser will extract a tag from the source code, wh…
Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question