Solved

Asynchronuous Socket handling

Posted on 2001-06-30
8
206 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
 

Author Comment

by:newborn
ID: 6240382
Win32 app...as i said i am using send() and recv() API's no CSocket or ASyncSocket
0
What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

 
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

Enabling OSINT in Activity Based Intelligence

Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

Join & Write a Comment

Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
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.

707 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

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now