非类类型错误和指针问题

Question

我目前收到以下消息：

从Arduino IDE接收时出错:请求非类类型为“EEPROMAnyType()”的“eType”中的成员“”EEPROMWriteAny“”

我不认为我在我的代码中通过引用正确地传递变量，因为这似乎是导致上面写的错误的主要问题。或者是EEPROMWriteAny和EEPROM ReadAny在一个类中，是什么导致了这个错误？我是否必须先从EEPROMAnyType类指向，然后再指向U类？EEPROMReadAny是否在嵌套类中？

我已经提供了头文件，cpp源文件，使用EEPROM库的arduino示例代码，以及我如何定义以下类的关键字。我还提供了一张我的库在其文件夹中的样子的图片，以防它也有问题。

头文件：

#ifndef EEPROMAnyType_h
#define EEPROMAnyType_h

#include <Arduino.h>
#include <EEPROM.h>

class EEPROMAnyType
{
    public:
        template <class U> int EEPROMReadAny(unsigned int addr, U& x); //Reads any type of variable EEPROM
        template <class U> int EEPROMWriteAny(unsigned int addr, U& x);//Writes any type of variable to EEPROM
    private:
        int i;
        const byte *p[];
        byte *p[];
};

#endif

CPP文件：

#include "Arduino.h"
#include "EEPROM.h"
#include "EEPROMAnyType.h"

template <class U>  int EEPROMAnyType::EEPROMReadAny(unsigned int addr, U x)
{
  int i;
  byte* p[sizeof(x)] = (byte*)(void*) x; //(void*) makes variable x "typeless" and then (byte*) casts the typeless variable as a byte type
  for(i = 0; i < sizeof(x); i++){ // Why can I not declare i as an integer in the for loop?
    p[i]= EEPROM.read(addr+i);
  }
  return i;
}
template <class U>  int EEPROMAnyType::EEPROMWriteAny(unsigned int addr, U x)
{
  int i = 0;
  const byte* p[i] = (const byte*)(const void*) x;
  for(i = 0; i < sizeof(x); i++){
    EEPROM.write(addr+i, p[i]);
  }
  return i;
}

Arduino代码：

#include  <Arduino.h>
#include  <EEPROM.h>
#include  <EEPROMAnyType.h>


EEPROMAnyType eType(); // used to call EEPROMAnyType which can write/read any kind of data type to/from EERPOM
int addr = 10; //memory location to be pass by value to EEPROMAnyType functions
String *p;// To pass by reference to EEPROMAnyType functions
String x; //will be assigned to EEPROM location

void setup() {
  x = "memory";
  p = &x;
  Serial.begin(9600);
  Serial.println("Hello World");  //shows start point of code
  eType.EEPROMWriteAny(addr, *p);  //Writes to EEPROM memory 10
  x = eType.EEPROMReadAny(addr, *p); //assigns bytes from EEPROM memory location to x
}

void loop() {
  Serial.print("x: ");
  Serial.println(x);
  Serial.print("no. of bytes stored in x: ");
  Serial.println(EEPROMWriteAny(addr, p));
  delay(1000);
}

下面是我如何定义类EPPROMAnyType的关键字：

EEPROMAnyType   KEYWORD1
EEPROMReadAny   KEYWORD2
EEPROMWriteAny  KEYWORD2

enter image description here

Answer 1

EEPROMAnyType eType()；-编译器会将此语句解释为函数声明，名称为eType，返回类型为EEPROMAnyType。因此，eType不是EEPROMAnyType的实例，任何类实例意义上的eType的使用都会产生错误。希望这能有所帮助。