一些实用的嵌入式 C 代码片段！

嵌入式大杂烩

lxii3qo5kfh6405513343.gif

快速获取结构体成员大小及偏移量获取结构体成员大小及偏移量的方式有多种。最简便的方式：
代码：
// 微信公众号：嵌入式大杂烩
#include   
// 获取结构体成员大小
#define  GET_MEMBER_SIZE(type, member)   sizeof(((type*)0)->member)
// 获取结构体成员偏移量
#define  GET_MEMBER_OFFSET(type, member)  ((size_t)(&(((type*)0)->member)))
typedef struct _test_struct0
{
char x;  
char y;
char z;
}test_struct0;
typedef struct _test_struct1
{
char a;  
char c;
short b;         
int d;
test_struct0 e;
}test_struct1;
int main(int arc, char *argv[])
{
printf("GET_MEMBER_SIZE(test_struct1, a) = %ld
", GET_MEMBER_SIZE(test_struct1, a));
    printf("GET_MEMBER_SIZE(test_struct1, c) = %ld
", GET_MEMBER_SIZE(test_struct1, c));
printf("GET_MEMBER_SIZE(test_struct1, b) = %ld
", GET_MEMBER_SIZE(test_struct1, b));
printf("GET_MEMBER_SIZE(test_struct1, d) = %ld
", GET_MEMBER_SIZE(test_struct1, d));
    printf("GET_MEMBER_SIZE(test_struct1, e) = %ld
", GET_MEMBER_SIZE(test_struct1, e));
    printf("test_struct1 size = %ld
", sizeof(test_struct1));
printf("GET_MEMBER_OFFSET(a): %ld
", GET_MEMBER_OFFSET(test_struct1, a));
printf("GET_MEMBER_OFFSET(c): %ld
", GET_MEMBER_OFFSET(test_struct1, c));
printf("GET_MEMBER_OFFSET(b): %ld
", GET_MEMBER_OFFSET(test_struct1, b));
printf("GET_MEMBER_OFFSET(d): %ld
", GET_MEMBER_OFFSET(test_struct1, d));
printf("GET_MEMBER_OFFSET(e): %ld
", GET_MEMBER_OFFSET(test_struct1, e));
return 0;
}
运行结果：