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野指针了啊 #2

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buzai opened this issue Jun 20, 2016 · 0 comments

buzai commented Jun 20, 2016

(NSString *) gateway2{
int mib[6] = {CTL_NET,
PF_ROUTE,//其实就是af_route的define
0, AF_INET,
NET_RT_FLAGS, RTF_GATEWAY};
size_t len;
NSAssert(sysctl(mib,sizeof(mib)/sizeof(int), 0, &len, 0, 0) >= 0, @"取长度出错");
// NSLog(@"sysctl buf长度%zd",len);
char *buf = calloc(len, 1);
NSAssert(sysctl(mib,sizeof(mib)/sizeof(int), buf, &len, 0, 0) >= 0, @"取长度出错");
// NSLog(@"实际内容长度%zd",len);
struct rt_msghdr *rtptr = (struct rt_msghdr *)buf;//routeptr, 后面解析数据就一样的了
struct sockaddr *sa = (struct sockaddr *)(rtptr + 1);
struct sockaddr_in *gateway = (struct sockaddr_in *)((char *)sa + sa->sa_len);//第一个是RTAX_DST, 我们只要网关
free(rtptr);
// NSLog(@"%s",inet_ntoa(gateway->sin_addr));
return [NSString stringWithUTF8String:inet_ntoa(gateway->sin_addr)];
}

return [NSString stringWithUTF8String:inet_ntoa(gateway->sin_addr)];
返回的时候报错了

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