相关疑难解决方法(0)

当我第一次在iphone上安装whatsapp时,当我打开它时,第一个屏幕已经知道我的SIM卡位置并显示国家代码.whatsapp如何知道这一点？由于苹果拒绝所有以编程方式使用SIM卡信息的应用程序.

我试着以这种方式获取路由器地址.

- (NSString *) routerIp {

  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 …