c里面使用libcurl库实现发送post并获取post到的内容

以下是c代码的实现:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

#define POSTURL "http://www.xiami.com/member/login"
#define POSTFIELDS "[email protected]&password=mypassword&autologin=1&submit=登 录&type="
#define FILENAME "curlposttest.log"

size_t write_data( void* buffer, size_t size, size_t nmemb, void *stream)
{
FILE *fptr = (FILE*)stream;
fwrite(buffer,size,nmemb,fptr);
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);
}