Ping!!!!

[ilamparithi]

Hi All,

I need to write a pgm to ping a system.

Also, i need to specify a timeout for that.

How to do that ?

Becoz most of the code to ping uses socket (even ICMP calls) commands like inet_addr.

Since these commands are used, when the system if not present takes a lot of time.

So how to write a pgm to ping a system by specifying Timeout?

With Regards,
A.Ilamparithi.

[Mick]

You can take the shortcut and use IcmpSendEcho(...)


http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iphlp/iphlp/icmpsendecho.asp

[Marc from D]

at least under win98 there is a DOS-commando ping that does almost everyhting you ask for. The only difficulty seems to analyze the results....

Maybe you just want to write a batch file?
just type "ping /?" in your DOS-box

Marc

[ilamparithi]

Originally posted by Mick
You can take the shortcut and use IcmpSendEcho(...)


http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iphlp/iphlp/icmpsendecho.asp

Hi,

If you see at the above link, you can find an example like this

// Declare and initialize variables
char *SendData = "Data Buffer";
LPVOID ReplyBuffer;

ReplyBuffer = (VOID*) malloc(sizeof(ICMP_ECHO_REPLY) + sizeof(SendData));
if ((dwRetVal = IcmpSendEcho(hIcmpFile,
inet_addr("123.456.789.0"),
SendData, sizeof(SendData),
NULL, ReplyBuffer,
sizeof(ReplyBuffer) + sizeof(ICMP_ECHO_REPLY),
1000)) != 0) {
printf("\tReceived %ld messages.\n", dwRetVal);
printf("\tMessage: %s\n", ReplyBuffer);
}
else {
printf("\tCall to IcmpSendEcho() failed.\n");
printf("\tError: %ld\n", GetLastError());
}

Even If you specify TIME OUT in IcmpSendEcho, if the system is down(offline) you can notice that it will take more time. This is becoz of inet_addr call used there. If the system is offline, this call takes lot of time and is the reason for delay.

With Best Regards,
A.Ilamparithi.

[Mick]

eh? how long of a delay? The only thing that could cause it is a DNS lookup.

[ilamparithi]

Originally posted by Mick
eh? how long of a delay? The only thing that could cause it is a DNS lookup.

Hi,

The delay is much larger. It is nearly 1.5 seconds.(in case of a offline system). But i want th timeout to be only 150 ms.

With Thanks,
A.Ilamparithi.

[Andreas Masur]

[Moved thread]