指针的妙用

来源：互联网发布：英雄无敌 mac版本编辑：程序博客网时间：2024/06/07 06:20
#include <stdio.h>#include <stdlib.h>typedef struct{    int *handle;    int msg_type;    int parm;}message_t;typedef void (* object_callback)(message_t *message);typedef struct{    int *handle;    int object_id;    object_callback def_cb;}object_t;void msg_process(message_t * msg){    switch(msg->msg_type)    {        case 0:            printf("Hello type 0. \n");            break;        case 1:            printf("Hello type 1. \n");            break;        default:            printf("msg_type = %d .\n", msg->msg_type);            break;    }}void main(int argc, char *argv[]){    message_t msg;    object_t * cur_obj = NULL;    object_t * process_obj = NULL;    cur_obj = (object_t *)malloc(sizeof(object_t));    cur_obj->object_id = 1;    cur_obj->def_cb = msg_process;    cur_obj->handle = (int *)cur_obj;  // 将cur_obj的地址赋给handle    msg.handle = cur_obj->handle;       //通过msg.handle传递cur_obj    msg.msg_type = atoi(argv[1]);        process_obj = (object_t *)msg.handle;   //通过msg.handle传递cur_obj    process_obj->def_cb(&msg);    if(cur_obj != NULL)    {        free(cur_obj);    }}
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