Question

编译我的arduino草图时遇到问题。

我收到这些错误：

C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:6: multiple definition of `Bit_Array::Bit_Array(unsigned long)'
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp\bit_array.cpp.o:C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:6: first defined here
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp\Master_Controller_modbus_RTU.cpp.o: In function `Bit_Array::~Bit_Array()':
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:18: multiple definition of `Bit_Array::~Bit_Array()'
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp\bit_array.cpp.o:C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:18: first defined here
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp\Master_Controller_modbus_RTU.cpp.o: In function `Bit_Array::~Bit_Array()':
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:18: multiple definition of `Bit_Array::~Bit_Array()'
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp\bit_array.cpp.o:C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:18: first defined here
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp\Master_Controller_modbus_RTU.cpp.o: In function `Bit_Array::Set_Value_MSB(unsigned char, unsigned long, unsigned char)':
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:26: multiple definition of `Bit_Array::Set_Value_MSB(unsigned char, unsigned long, unsigned char)'
C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp\bit_array.cpp.o:C:\Users\FRANCE~1\AppData\Local\Temp\build8652217817452966608.tmp/bit_array.cpp:26: first defined here
collect2.exe: error: ld returned 1 exit status
Errore durante la compilazione

这意味着我已经多次定义了我的构造函数，析构函数和方法。我有点困惑，因为我已经定义了一次，正如你所看到的那样。

bit_array.h

#ifndef bit_array
#define bit_array

// includo il supporto per le funzioni base dell'arduino
#if defined(ARDUINO) && ARDUINO >= 100
  #include "Arduino.h"
#else
  #include "WProgram.h"
  #include <pins_arduino.h>
#endif


#include<cstdint> // libreria per supporto tipo uint8_t in C++ standard (arduino lo conosce, ma voglio fare la libreria cross-plattform)

class Bit_Array
    {
     private:
        unsigned long N_Elementi;                 // Numero di bit della memoria effettivamente utilizzati (es 15 bit occupano 2byte, ma solo i primi 15bit hanno significato). 
        uint8_t* Array;                           // array di uint8_t. Ogni uint8_t verrà interpretato come una sequenza di 8 bool
        unsigned long Dimensione;                 // Dimensione (in byte) della memoria puntata da Array. Deve essere allocata una quantità di memoria pari a upper_bound(N_elementi/8)

     public:
        Bit_Array(const unsigned long Number_of_Elements);
        ~Bit_Array();

        // Getters
        uint8_t Get_Value_MSB(const unsigned long Inizio, const uint8_t Lunghezza ) const;
        uint8_t Get_Value_LSB(const unsigned long Inizio, const uint8_t Lunghezza ) const;           // Implementazione futura

        // Setters
        void Set_Value_MSB(const uint8_t B, const unsigned long Inizio, const uint8_t Lunghezza);
        void Set_Value_LSB(const uint8_t B, const unsigned long Inizio, const uint8_t Lunghezza);    // Implementazione futura
        void Print() const; 
    };

#endif

bit_array.cpp

#include "bit_array.h"

Bit_Array::Bit_Array(const unsigned long Number_of_Elements)
    {
      if(Number_of_Elements <= 0)
            {Array=NULL;}        // non alloco la memoria
      else
            {
             N_Elementi = Number_of_Elements;
             Dimensione = (unsigned long) (( (double)Number_of_Elements/8.0 ) + 0.5);   // alloco una quantità di memoria sufficiente a memoriazzare i Number_of_Elements. La memoria viene allocata con granularità di byte, quindi devo allocare Number_of_Elements/8 byte e poi arrotondare per eccesso

            }
    }

Bit_Array::~Bit_Array()
    {if(Array!=NULL)
        {delete Array;
         Array=NULL;}
     }


 void Bit_Array::Set_Value_MSB(const uint8_t B, const unsigned long Inizio, const uint8_t Lunghezza)
    {

    }

在主要仅限

#include "bit_array.cpp"

同样的事情发生在我的所有其他方法上。

使用DevC ++ IDE，我可以成功编译代码，所以我认为这个问题与Arduino IDE有关。

非常感谢你的帮助，祝你今天愉快

Answer 1

我建议你看一下this article，以便更好地理解include指令。

C ++程序是在两个阶段的过程中构建的。首先，每个源文件都是自己编译的。编译器为每个编译的源文件生成中间文件。这些中间文件通常称为目标文件 - 但不要将它们与代码中的对象混淆。一旦所有文件都被单独编译，就会将所有目标文件链接在一起，从而生成最终的二进制文件（程序）。

即使你的程序中声明了MyClass，它也没有在main.cpp中声明，因此当你编译main.cpp时会出现错误。

这是头文件的来源。头文件允许您使界面对其他.cpp文件可见

的确，您需要包含头文件，而不是源文件。希望这会有所帮助。

Arduino IDE编译器错误多重定义

1 个答案: