通过函数指针模拟实现函数不停调用 在vc6.0下已测试

#include "stdio.h"
#include "conio.h"
#include "stdlib.h"
#include "string.h"
#include "windows.h"

int times=0;//
int haha();
int minus();
int check();
////////////////////////////////////////////////////////////////////////////////////////////////////
typedef int (*pDis)(); //同理 以后 pDis就可以代表这类的函数指针了
//int libfun(pDis pd);//函数指针做参数的libfun函数声明

static int soc_cb_http(int s, int e);
/* 定义函数指针 */
static int http_cb(int s, int k, int p1, int p2);
typedef int (*ms_http_cb_t)(int s, int e, int p1, int p2);

/* http 回调句柄 */
ms_http_cb_t cb=NULL; //实例化一个函指

// pDis cb;
// pDis cb2;

int main(void)//相当于底层内核不断刷新等待消息来临
{
 
 pDis pd=NULL;//实例化一个函数指针
 pd=soc_cb_http;//指向一个函数
 cb=http_cb;

 printf("*******************************************\n");
 printf("*           CALL_BACK_TEST                *\n");
 printf("*******************************************\n");

 printf("begin! time is %d\n",times);
 while(1)
 {
 
  if(times<14)
  {
   pd(0,times);
   Sleep(3000);
   printf("/////////////////////////////////////////\n");
  }
  else
   break;
  times++;
 }
 printf("last! time is %d\n",times);
 return 0;
}

int check()
{
 printf("just test!!!!!!!!!!!!!!!!!!!!!!!\n");
 return 0;
}

static int soc_cb_http(int s, int e) 
{
 int ret = 0;
 
  switch (e)
  {
  case 1:
   printf("1\n");
   cb(s, 1, 3, 4);
   break;
  case 2:
   cb(s, 2, 0, 0);
   printf("2\n");
   break;
  case 3:
   cb(s, 3, 0, 0);
   printf("3\n");
   break;
  case 4:
   cb(s, 4, 0, 0);
   printf("4\n");
   break;
  case 5:
   cb(1, 5, 3, 4); 
   break;
  }
 return ret;
}

static int http_cb(int s, int k, int p1, int p2)
{
 static int sent = 0;
 printf("http_cb(%d, %d, %d, %d)", s, k, p1, p2);
 switch (k)
 {
 case 1:
  printf("正在查询DNS信息");
  check();//调用简单函数看看
  printf("k=%d\n",k);
  break;
 case 2:
  printf("查询DNS信息成功\n");
  printf("k =%d\n",k);
  break;
 case 3:
  printf("查询DNS信息失败");
  printf("DNS query failed!!!\n");
  break;
 case 4:
  printf("正在连接");
  printf("connectting...\n");
  break;
 case 5:
  printf("已连接");
  printf("Connected...\n");
  break;
 case 6:
  printf("连接失败");
  printf("Connect failed!!!\n");
  break;
 case 7:
  printf("正在发送请求头");
  printf("Sending request headers...\n");
  break;
 case 8:
  printf("正在发送请求体");
  printf("Sending request body...");
  //这里准备调用其他函数
  /*
  {
   int ret;
   char buf[8];
   sprintf(buf, "12345678");
   while ((ret = ms_http_post_body(s, buf, sizeof(buf))) > 0)
   {
    sent += ret;
    if (sent >= BODY_LEN)
    {
     //ms_http_post_body(s, "\r\n", 2);
     return sent;
    }
   }

   if (ret == 0)
   {
    return sent;
   }
   else
   {
    return ret;
   }
  }
  */
  break;
 case 9:
  printf("请求体发送完成");
  printf("All request data sent...\n");
  break;
 case 10:
  printf("正在接收响应码");
  printf("Recieving response status-line, res code\n");
  break;
 case 11:
  printf("正在接收响应头");
  printf("Recieving response headers...\n");
  /*
  {
   char val[20];
   int val_len = sizeof(val);
   val_len = ms_http_get_header((char*)p1, "Content-Length", val, &val_len);
   printf("Response: Content-Length:%d, %d", atoi(val), val_len);
  }
  */
  break;
 case 12:
  printf("正在接收响应体");
  printf("Recieving response body...\n");
  /*
  {
   int recv = 0;
   char * p = (char*)p1;
   while (recv < p2)
   {
    char buf[128] = {0};
    int to_recv = sizeof(buf)-1    memcpy(buf, p, to_recv);
    buf[to_recv] = 0;
    p += to_recv;
    recv += to_recv;
    printf("buf:%s", buf);
   }
  }  
  */
  break;
 case 13:
  printf("响应体接收完成");
  printf("All response data recieved...\n");
  
  break;
 }
 return 0;
}