Question

我尝试使用asyncsocket框架获取ip地址。什么时候通过以太网电缆，以下方法工作正常。但是当尝试使用wifi接入点获取IP地址时，它返回nil。

这是一种方法：

- (NSData *)wifiAddress

{ //在iPhone上，WiFi总是“en0”

NSData *result = nil;

struct ifaddrs *addrs;
const struct ifaddrs *cursor;

if ((getifaddrs(&addrs) == 0))
{
    cursor = addrs;
    while (cursor != NULL)
    {
        NSLog(@"cursor->ifa_name = %s", cursor->ifa_name);

        if (strcmp(cursor->ifa_name, "en0") == 0)
        {
            if (cursor->ifa_addr->sa_family == AF_INET)
            {
                struct sockaddr_in *addr = (struct sockaddr_in *)cursor->ifa_addr;
                NSLog(@"cursor->ifa_addr = %s", inet_ntoa(addr->sin_addr));

                result = [NSData dataWithBytes:addr length:sizeof(struct sockaddr_in)];
                cursor = NULL;
            }
            else
            {
                cursor = cursor->ifa_next;
            }
        }
        else
        {
            cursor = cursor->ifa_next;
        }
    }
    freeifaddrs(addrs);
}

return result;

}

Answer 1

我们遇到的问题是en0上的完全匹配并不总是返回wifi地址。我们有类似于以下内容。希望这可以帮助。

NSString* wifiIp = [NetUtils getLocalAddress:@"en"];

+ (NSString *) getLocalAddress:(NSString*) interface
{
    NSString *address = nil;
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;

    success = getifaddrs(&interfaces);
    if (success == 0)
    {
        temp_addr = interfaces;
        while(temp_addr != NULL)
        {
            if(temp_addr->ifa_addr->sa_family == AF_INET)
            {
                NSRange range = [[NSString stringWithUTF8String:temp_addr->ifa_name] rangeOfString : interface];

                if(range.location != NSNotFound)
                {
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }

            temp_addr = temp_addr->ifa_next;
        }
    }

    freeifaddrs(interfaces);

    return address;
}

获取Wifi地址问题

1 个答案: