c++libcur发送post请求

#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <curl/curl.h>
#include   <iostream> 
  using   namespace   std   ;
#define POSTURL    "http://localhost:8088/huiermis/business/debugAction.do?method=enter"
#define POSTFIELDS "&myear=5"
#define FILENAME   "curlposttest.log"
char *a;
size_t write_data(void* buffer,size_t size,size_t nmemb,void *stream)
{
FILE *fptr = (FILE*)stream;
size_t retCount=fwrite(buffer,size,nmemb,fptr);
cout << (char *)buffer << endl;
a=(char *)buffer;
cout<<a;
string str((char*)buffer,(char*)buffer+retCount);
cout<<str<<endl;
return size*nmemb;
}


int main(int argc,char *argv[])
{  
CURL *curl;
CURLcode res;
FILE* fptr;
struct curl_slist *http_header = NULL;


if ((fptr = fopen(FILENAME,"w")) == NULL)
{
fprintf(stderr,"fopen file error:%s\n",FILENAME);
return -1;
}


curl = curl_easy_init();
if (!curl)
{
fprintf(stderr,"curl init failed\n");
return -1;
}


curl_easy_setopt(curl,CURLOPT_URL,POSTURL); //url地址
curl_easy_setopt(curl,CURLOPT_POSTFIELDS,POSTFIELDS); //post参数
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,write_data); //对返回的数据进行操作的函数地址
curl_easy_setopt(curl,CURLOPT_WRITEDATA,fptr); //这是write_data的第四个参数值
curl_easy_setopt(curl,CURLOPT_POST,1); //设置问非0表示本次操作为post
curl_easy_setopt(curl,CURLOPT_VERBOSE,1); //打印调试信息
//curl_easy_setopt(curl,CURLOPT_HEADER,1); //将响应头信息和相应体一起传给write_data
curl_easy_setopt(curl,CURLOPT_FOLLOWLOCATION,1); //设置为非0,响应头信息location
curl_easy_setopt(curl,CURLOPT_COOKIEFILE,"/Users/zhu/CProjects/curlposttest.cookie");


res = curl_easy_perform(curl);


if (res != CURLE_OK)
{
switch(res)
{
case CURLE_UNSUPPORTED_PROTOCOL:
fprintf(stderr,"不支持的协议,由URL的头部指定\n");
case CURLE_COULDNT_CONNECT:
fprintf(stderr,"不能连接到remote主机或者代理\n");
case CURLE_HTTP_RETURNED_ERROR:
fprintf(stderr,"http返回错误\n");
case CURLE_READ_ERROR:
fprintf(stderr,"读本地文件错误\n");
default:
fprintf(stderr,"返回值:%d\n",res);
}
return -1;
}


curl_easy_cleanup(curl);
}