I'm programming in objective-C for several iPod devices and I was wondering about something. I'm developing an application that utilizes the server-client model and I'm using the UDP protocol with C sockets. Is there a class out there that allows me to determine the iPod devices IP address? After googling around other forums, I haven't found anything. Obviously this command wouldn't work, but something like ipAddress = self.ip is what I had in mind. I'm setting up multicast C sockets and I'm trying to do a workaround that resembles the ping command, which obviously doesn't exist in objective-C either or to my knowledge (which is limited, as I've only been programming in objective-C since the start of this summer) at least. Any advice or tips?
A:
Did you see this? http://www.appsamuck.com/day4.html. I think the right answer is to use CFHost
in the SDK.
EDIT
It appears the source in that project is using the following code, which makes it a completely invalid solution unless Apple decides to put NSHost
into the SDK.
-(NSString*)getAddress {
char iphone_ip[255];
strcpy(iphone_ip,"127.0.0.1"); // if everything fails
NSHost* myhost =[NSHost currentHost];
if (myhost)
{
NSString *ad = [myhost address];
if (ad)
strcpy(iphone_ip,[ad cStringUsingEncoding: NSISOLatin1StringEncoding]);
}
return [NSString stringWithFormat:@"%s",iphone_ip];
}
marcc
2009-07-10 19:12:57
This is the first thing that popped into my head, as well
ryansstack
2009-07-10 19:17:47
NSHost is not supported by the iPhone SDK. It would be great if it were though.
Josh Bradley
2009-07-10 20:32:41
NSHost is supported in iPhone SDK!
2009-11-13 16:58:28
NSHost is supported by the iPhone SDK!
2009-11-13 18:21:12
yakovlev
2010-03-14 16:47:59
+2
A:
This snippet of code will retrieve it by looping through the interfaces.
- (NSString *)getIPAddress
{
NSString *address = @"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0)
{
// Loop through linked list of interfaces
temp_addr = interfaces;
while(temp_addr != NULL)
{
if(temp_addr->ifa_addr->sa_family == AF_INET)
{
// Check if interface is en0 which is the wifi connection on the iPhone
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"])
{
// Get NSString from C String
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
return address;
}
byte
2009-07-10 19:16:52
First test and run the code , then post the full code.i am getting warings and error from the above code.warning: implicit declaration of function 'getifadrs'error: dereferencing pointter to incomplete type for (temp_addr != NULL)and few more errors.
Biranchi
2009-10-30 07:45:12