使用libcurl 函数库获取网页数据代码

/**
*	File: w3G.c
*	libcurl is an open source lib for url.
*
*	Copyright: (c) T-ware Inc.
*
*	Function: get 3G data from internet
*
*	Author: Tody Guo
*	Date: 2013-10-06
*	
**/
//#include "stdafx.h"
#include #include //#pragma comment(lib, "libcurl.lib")
void oops(char *msg)
{
fprintf(stderr, "%s\nReturn code: 1", msg);
exit(1);
}
size_t write_data(void *buffer, size_t size, size_t nmemb, void *user_p)
{
FILE *f = (FILE *) user_p;
size_t return_size = fwrite(buffer, size, nmemb, f);
return return_size;
}
int main(int argc, char* argv[])
{
CURL *curl;
CURLcode resCode;
FILE *fp =NULL;
char url[256]="www.baidu.com";
printf("Version: %s\n", curl_version());
if (argc>=2)
{
strncpy(url, argv[1], 256);
}
curl = curl_easy_init();
if (NULL==curl)
oops("init failed!");
curl_easy_setopt(curl, CURLOPT_URL, url);
if (argc == 3)
{
fp = fopen(argv[2], "wb+");
if (fp==NULL)
oops("open file failed");
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
fprintf(stderr, "Saving to file(%s)...", argv[2]);
}
resCode = curl_easy_perform(curl);
if (resCode!=0)
oops((char *)curl_easy_strerror(resCode));
curl_easy_cleanup(curl);
if(fp != NULL) 
fclose(fp);
fprintf(stderr, "\nReturn code: 0");
return 0;
}