Solved

Asynchronuous Socket handling

Posted on 2001-06-30
8
215 Views
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 thread...it 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

Regards

Newborn
0
Comment
Question by:newborn
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 30

Expert Comment

by:Axter
ID: 6240371
What OS, What compiler, What type of project???
0
 

Author Comment

by:newborn
ID: 6240377
OS:win95/98/NT/2000
Compiler:VC++ 6.0
An IRC Client,TCP/IP protocol,stream sockets
0
 
LVL 30

Expert Comment

by:Axter
ID: 6240380
Is the project an MFC, Win32-App, or Win32-Console?
0
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.

 

Author Comment

by:newborn
ID: 6240382
Win32 app...as i said i am using send() and recv() API's no CSocket or ASyncSocket
0
 
LVL 32

Expert Comment

by:jhance
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.
0
 
LVL 14

Expert Comment

by:AlexVirochovsky
ID: 6240551
see example of using asynchronously in
  Send Mail (socket 2) "Davide Libenzi"
http://www.xmailserver.org/davide.html
0
 
LVL 14

Accepted Solution

by:
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)
                break;

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

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

    WSAEventSelect(SockFD, hConnectEvent, 0);
    WSACloseEvent(hConnectEvent);

    return (iConnectResult);

}
....
Full project contens many such examples.
I hope, it helps. Alex
0
 

Author Comment

by:newborn
ID: 6262017
i have solved my prob ,www.sockets.com 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
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering 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

What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

828 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