有的需求中需要获取手机的ip地址，下面的函数就能完成这一功能。
首先要引入两个头文件：
#include <ifaddrs.h>
#include<arpa/inet.h>
然后是获取ip地址的函数实现
- (NSString*)getPhoneIPAddress
{
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"])
{
// C String 转NSString
address = [NSStringstringWithUTF8String:inet_ntoa(((structsockaddr_in*)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
// 释放内存
freeifaddrs(interfaces);
return address;
}
注：该方法只能在真机中运行有效。
