我过去曾经使用过ALSystemUtilities。基本上,您必须从外部拨打电话才能找到答案。
+ (NSString *)externalIPAddress {
// Check if we have an internet connection then try to get the External IP Address
if (![self connectedViaWiFi] && ![self connectedVia3G]) {
// Not connected to anything, return nil
return nil;
}
// Get the external IP Address based on dynsns.org
NSError *error = nil;
NSString *theIpHtml = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.dyndns.org/cgi-bin/check_ip.cgi"]
encoding:NSUTF8StringEncoding
error:&error];
if (!error) {
NSUInteger an_Integer;
NSArray *ipItemsArray;
NSString *externalIP;
NSScanner *theScanner;
NSString *text = nil;
theScanner = [NSScanner scannerWithString:theIpHtml];
while ([theScanner isAtEnd] == NO) {
// find start of tag
[theScanner scanUpToString:@"<" intoString:NULL] ;
// find end of tag
[theScanner scanUpToString:@">" intoString:&text] ;
// replace the found tag with a space
//(you can filter multi-spaces out later if you wish)
theIpHtml = [theIpHtml stringByReplacingOccurrencesOfString:
[ NSString stringWithFormat:@"%@>", text]
withString:@" "] ;
ipItemsArray = [theIpHtml componentsSeparatedByString:@" "];
an_Integer = [ipItemsArray indexOfObject:@"Address:"];
externalIP =[ipItemsArray objectAtIndex:++an_Integer];
}
// Check that you get something back
if (externalIP == nil || externalIP.length <= 0) {
// Error, no address found
return nil;
}
// Return External IP
return externalIP;
} else {
// Error, no address found
return nil;
}
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系 [email protected] 删除。
我来说两句