C 语言中的指针函数写法

1. 指针函数使用

#include <stdio.h>
#define uint8           unsigned char
#define uint16          unsigned short
#define uint32          unsigned int

uint8 get_device_type_flash() { 
    printf("--------------- run ------------------ \n");
    return 100;
}
uint8 get_flash_1byte(void * funtype){
    uint8 (* fun)() = funtype;
    uint8 num = fun();
    return num;
}
uint8 get_device_type() { return get_flash_1byte(get_device_type_flash); }

int main(int argc, char const *argv[])
{
    uint8 num = get_device_type();
    printf("res: %d \n", num);
    return 0;
}

2. 指针函数组

#include <stdio.h>

void a1(int a, void * ptr) {

    printf("[fun a1] %02x %p %p \n", a, a, ptr);
}
void a2(int a, void * ptr) {
    printf("[fun a2] %02x %p %p \n", a, a, ptr);
}

// ****************数组存储指针函数的实现****************/

int main(int argc, char const *argv[])
{
    int a = 4;
    unsigned char *ptr = "hanguangxue";
    printf("%02x %p %p \n", a, a, ptr);

    printf("a1 a2 方法名地址:  %p %p \n", a1, a2);

    void (*fun[2])(int, void *) = {a1, a2};
    printf("%p \n", fun[0]);
    printf("%p \n", fun[1]);
    fun[0](a, ptr);
    fun[1](a, ptr);
    return 0;
}