Thread: Network Connectivity Programming.

I need to create a program that will basically ping a remote host then do something every time that ping fails to get a reply back. I've seen people post code like this before (see below), but this doesn't actually perform in any different fashion if the ping 'fails'.

code:
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char blah1[10];
int blah2[10];
char command[20];

blah1 = ping;
blah2 = 127.0.0;

strcat(command, blah1);
strcat(command, blah2);

system(command);
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Here's an idea:

Try doing a connect() directly to the IP address you are trying to ping. You would have the information you want in just one function call (well, actually two. you'd do a socket() just before it).

But the point is, you would not need to do a system() and have its output in a file and then read from a file, parse it. And not to mention handling all the potential errors conditions associated with disk IO.

Your code would be something like:

Code:

mySocket = socket( /*args */ );
if ( sock_fd == INVALID_SOCKET )
{
   // handle error.
}

err = connect( mySocket, /* rest of the args */ );
if ( ret_code == SOCKET_ERROR )
{
   // connect() failed. Equivalent to ping failed at system
}

Hope this helps.

Thanks Ruchikar! Let me take a stab at using the connect() function and see if I can get it to do what I need. Thanks again!