C++ IPAddress::isSet方法代码示例

int ESP8266WiFiGenericClass::hostByName(const char* aHostname, IPAddress& aResult, uint32_t timeout_ms)
{
    ip_addr_t addr;
    aResult = static_cast<uint32_t>(0);

    if(aResult.fromString(aHostname)) {
        // Host name is a IP address use it!
        DEBUG_WIFI_GENERIC("[hostByName] Host: %s is a IP!\n", aHostname);
        return 1;
    }

    DEBUG_WIFI_GENERIC("[hostByName] request IP for: %s\n", aHostname);
    err_t err = dns_gethostbyname(aHostname, &addr, &wifi_dns_found_callback, &aResult);
    if(err == ERR_OK) {
        aResult = IPAddress(&addr);
    } else if(err == ERR_INPROGRESS) {
        _dns_lookup_pending = true;
        delay(timeout_ms);
        _dns_lookup_pending = false;
        // will return here when dns_found_callback fires
        if(aResult.isSet()) {
            err = ERR_OK;
        }
    }

    if(err != 0) {
        DEBUG_WIFI_GENERIC("[hostByName] Host: %s lookup error: %d!\n", aHostname, (int)err);
    } else {
        DEBUG_WIFI_GENERIC("[hostByName] Host: %s IP: %s\n", aHostname, aResult.toString().c_str());
    }

    return (err == ERR_OK) ? 1 : 0;
}

/**
 * Change IP configuration settings disabling the dhcp client
 * @param local_ip   Static ip configuration
 * @param gateway    Static gateway configuration
 * @param subnet     Static Subnet mask
 * @param dns1       Static DNS server 1
 * @param dns2       Static DNS server 2
 */
bool ESP8266WiFiSTAClass::config(IPAddress local_ip, IPAddress arg1, IPAddress arg2, IPAddress arg3, IPAddress dns2) {

  if(!WiFi.enableSTA(true)) {
      return false;
  }

  //ESP argument order is: ip, gateway, subnet, dns1
  //Arduino arg order is:  ip, dns, gateway, subnet.

  //first, check whether dhcp should be used, which is when ip == 0 && gateway == 0 && subnet == 0.
  bool espOrderUseDHCP = (local_ip == 0U && arg1 == 0U && arg2 == 0U);
  bool arduinoOrderUseDHCP = (local_ip == 0U && arg2 == 0U && arg3 == 0U);
  if (espOrderUseDHCP || arduinoOrderUseDHCP) {
      _useStaticIp = false;
      wifi_station_dhcpc_start();
      return true;
  }

  //To allow compatibility, check first octet of 3rd arg. If 255, interpret as ESP order, otherwise Arduino order.
  IPAddress gateway = arg1;
  IPAddress subnet = arg2;
  IPAddress dns1 = arg3;

  if(subnet[0] != 255)
  {
    //octet is not 255 => interpret as Arduino order
    gateway = arg2;
    subnet = arg3[0] == 0 ? IPAddress(255,255,255,0) : arg3; //arg order is arduino and 4th arg not given => assign it arduino default
    dns1 = arg1;
  }

  // check whether all is IPv4 (or gateway not set)
  if (!(local_ip.isV4() && subnet.isV4() && (!gateway.isSet() || gateway.isV4()))) {
    return false;
  }

  //ip and gateway must be in the same subnet
  if((local_ip.v4() & subnet.v4()) != (gateway.v4() & subnet.v4())) {
    return false;
  }

  struct ip_info info;
  info.ip.addr = local_ip.v4();
  info.gw.addr = gateway.v4();
  info.netmask.addr = subnet.v4();

  wifi_station_dhcpc_stop();
  if(wifi_set_ip_info(STATION_IF, &info)) {
      _useStaticIp = true;
  } else {
      return false;
  }

  if(dns1.isSet()) {
      // Set DNS1-Server
      dns_setserver(0, dns1);
  }

  if(dns2.isSet()) {
      // Set DNS2-Server
      dns_setserver(1, dns2);
  }

  return true;
}