How To Calculate A Value In Web Service
Apr 26, 2010
I'm having some difficulty calculating a value in my .net web service. I'm attempting to convert an ip address based on this forumula:
Csharp Code:
string[] ipSec = null;
ipSec = ip.Split(new Char[] { '.' });
int ipCode = ((Convert.ToInt32(ipSec[0])*256+Convert.ToInt32(ipSec[1]))*256+Convert.ToInt32(ipSec[2]))*256 + Convert.ToInt32(ipSec[0]);
//long ipCode = Convert.ToInt64(ipSec[3]) + (Convert.ToInt64(ipSec[2]) * 256) + (Convert.ToInt64(ipSec[1]) * 256 * 256) + (Convert.ToInt32(ipSec[0]) * 256 * 256 * 256);
However it is not producing the results I expect. For example, for the ip: 161.130.197.157 it produces the result -1585265251. I can't figure out why this is outputting a negative number. I've tried changing it from int to long above but it made no difference.
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