C++ 尝试在自定义类（ESP8266）中使用NTPClient时获取异常

当我尝试在自定义类RealTimeService中使用NTPClient时，出现了一个异常（请参见下文）。请告知原因和如何修复。多谢各位

文件RealTimeService.h:

#ifndef RealTimeLib
#define RealTimeLib

#include <NTPClient.h>
#include <WiFiUdp.h>

class RealTimeService {
  private:
    NTPClient _ntp;
    NTPClient _createNtpClient();
    void _update();
  public:
    RealTimeService();
    void begin();
};

#endif

文件WebServerSecure.ino:

#include <ESP8266WiFi.h>
#include "RealTimeService.h"


#ifndef STASSID
#define STASSID "Sedmikraska"
#define STAPSK  "38098246"
#endif

const char* ssid = STASSID;
const char* password = STAPSK;

RealTimeService realTime;

void setup(void) {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  realTime.begin();
}

void loop(void) {
  delay(1000);
}

解码后的堆栈是：

0x4020714a: HardwareSerial::begin(unsigned long, SerialConfig, SerialMode, unsigned char, bool) at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\HardwareSerial.cpp line 51
0x4020804c: __unhandled_exception_cpp() at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\core_esp8266_main.cpp line 229
0x4020a07c: NTPClient::begin(int) at C:\Users\user\Documents\Arduino\libraries\NTPClient\NTPClient.cpp line 61
0x40202544: NTPClient::begin() at C:\Users\user\Documents\Arduino\libraries\NTPClient\NTPClient.cpp line 53
0x40201028: RealTimeService::_update() at C:\Users\user\AppData\Local\Temp\arduino_build_506039\sketch\RealTimeService.cpp line 20
0x40201b04: ESP8266WiFiSTAClass::status() at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp line 634
0x40201058: RealTimeService::begin() at C:\Users\user\AppData\Local\Temp\arduino_build_506039\sketch\RealTimeService.cpp line 16
0x4020115c: setup() at C:\Users\user\Documents\Arduino\WebServerSecure/WebServerSecure.ino line 23
0x40208224: loop_wrapper() at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\core_esp8266_main.cpp line 194

---

您可以在

RealTimeService:：\u createNtpClient（）

中定义

udp

，并将其传递给

NTPClient

<代码>NTPClient在

RealTimeService:：\u createNtpClient（）

返回后将继续需要它，但

udp

将变得无效。即使

NTPClient

复制它，也会调用它的析构函数，使它使用的资源无效

您需要将

udp

更改为一个实例变量，以便它能够像

\u ntp

一样存在

class RealTimeService {
  private:
    WiFiUDP _udp;
    NTPClient _ntp;
...

及

您的代码也在重复调用

\u ntp.begin（）

。您应该确保您正在使用的NTP库允许这样做；有时编写库时，它们的

begin（）

方法只能调用一次

0x4020714a: HardwareSerial::begin(unsigned long, SerialConfig, SerialMode, unsigned char, bool) at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\HardwareSerial.cpp line 51
0x4020804c: __unhandled_exception_cpp() at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\core_esp8266_main.cpp line 229
0x4020a07c: NTPClient::begin(int) at C:\Users\user\Documents\Arduino\libraries\NTPClient\NTPClient.cpp line 61
0x40202544: NTPClient::begin() at C:\Users\user\Documents\Arduino\libraries\NTPClient\NTPClient.cpp line 53
0x40201028: RealTimeService::_update() at C:\Users\user\AppData\Local\Temp\arduino_build_506039\sketch\RealTimeService.cpp line 20
0x40201b04: ESP8266WiFiSTAClass::status() at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp line 634
0x40201058: RealTimeService::begin() at C:\Users\user\AppData\Local\Temp\arduino_build_506039\sketch\RealTimeService.cpp line 16
0x4020115c: setup() at C:\Users\user\Documents\Arduino\WebServerSecure/WebServerSecure.ino line 23
0x40208224: loop_wrapper() at C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\core_esp8266_main.cpp line 194

class RealTimeService {
  private:
    WiFiUDP _udp;
    NTPClient _ntp;
...

NTPClient RealTimeService::_createNtpClient() {
  NTPClient ntp(_udp, "pool.ntp.org", 3600, 86400000);