linux c函数指针的应用

头文件：1.h

#include<stdio.h>

int nul_func();
int test1(int a,int b); 
int test2(int a,int b,int c); 
int test3(int a,int b,int c,int d); 
int GetFunc(char *p,int (**pfunc)());

struct test
{
    char *pName;
    int  (*pFunc)();
}fun[] = { 

    {"test1",test1},
    {"test2",test2},
    {"test3",test3},
    {"nul_func",nul_func}

};

 

函数实现：15.c

#include "1.h"
#include <string.h>

int GetFunc(char *p,int (**pfunc)())
{
    int i=0;

    while( memcmp(fun[i].pName,"nul_func",8) != 0)
    {   
        if( memcmp(p,fun[i].pName,strlen(fun[i].pName)) == 0 ) 
        {   
            *pfunc = fun[i].pFunc;
            return 0;
        }   
        i++;
    }   
    
    printf("%s\n","No Such Func.");
    return 0;
}

int test1(int a, int b)
{
    printf("a = %d, b = %d\n",a,b);
    return 0;
}

int test2(int a, int b, int c)
{
    printf("a = %d, b = %d , c = %d\n",a,b,c);
    return 0;
}

int test3(int a, int b,int c,int d)
{
    printf("a = %d, b = %d, c = %d, d = %d\n",a,b,c,d);
    return 0;
}

int nul_func()
{
    printf("%s\n","No Such Func");
    return 0;
}

主函数：14.c

#include<stdio.h>

int main()
{
    int i;
    int (*pFunc)();
    char caName[10] = ""; 
    
    memcpy(caName,"test1",5);
    i = GetFunc(caName,&pFunc);
    printf("%s\n",caName);
    i = (*pFunc)(1,2);

    memcpy(caName,"test2",5);
    i = GetFunc(caName,&pFunc);
    printf("%s\n",caName);
    i = (*pFunc)(3,4,5);

    memcpy(caName,"test3",5);
    i = GetFunc(caName,&pFunc);
    printf("%s\n",caName);
    i = (*pFunc)(6,7,8,9);

    return 0;
}

 

编译：gcc 14.c 15.c -o test

结果：./test