带有typedef结构的extern const

Question

I have in .h file:

typedef struct MyName {

uint8_t AA;
uint8_t BB; 
};

extern const MyName NewName[num];

in file .c I have:

const MyName NewName[num] = {{0x01,0x02}, {0x03,0x04}};

Compiler complains 'unknown type name' MyName. How I can get around this? Thank you for helping.

Answer 1

The typedef should be

typedef struct myName 
{
    uint8_t AA;
    uint8_t BB; 
} 
MyName;

Without the final MyName , you haven't actually typedef'd anything.

Answer 2

the correct way to write this is:

in the .h file

struct MyName 
{
   uint8_t AA;
   uint8_t BB; 
};

extern const struct MyName NewName[];
extern const int num;

in the .c file it should be:

const struct MyName NewName[] = {{0x01,0x02}, {0x03,0x04}};
const int num = sizeof( NewName ) / sizeof(struct MyName);