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8.0

Winsock programming   using msdn PING sample code

Asked by jnearing in C++ Programming Language

Tags: msdn, ping, winsock, sample


I have pasted the msdn PING sample code into an application that needs to know if a machine is still running on the network.    

I have made no changes to the sample code.  This line --

  bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,
                           sizeof(timeout));

with timeout having a value of  1000, it seems like the recvfrom should time out after a second.

This is the call to recvfrom, as in the sample code


     bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from,
                     &fromlen);

     if (bread == SOCKET_ERROR){
       if (WSAGetLastError() == WSAETIMEDOUT) {
            printf("timed out\n");

If I take the machine being pinged off the network, recvfrom never returns.   The timeout doesn't seem to work.

What do I need to modify or include in the sample code from msdn to make it handle the machine PINGed being a valid workstation , but having been shut down or taken off the network.    Assume I am not a Winsock programmer and don't have time to become one tonight.

thanks in advance

[+][-]02/18/01 09:07 PM, ID: 5854797Accepted Solution

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About this solution

Zone: C++ Programming Language
Tags: msdn, ping, winsock, sample
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Solution Provided By: clarka
Participating Experts: 1
Solution Grade: A
 
[+][-]03/01/01 09:01 AM, ID: 5891693Author Comment

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