c++使用libcurl

最近一直在寫個抓取天貓數據的小工具，用到libcurl庫

#include 
#include "curl/curl.h"
using namespace std;

void tcurl();
size_t myWrite( void *ptr, size_t size, size_t nmemb, void *stream);

int main(int argc, char const *argv[])
{
    tcurl();
    return 0;
}

void tcurl(){
    cout << "start" << endl;
    char *version = curl_version();
    CURL *curl;
    curl = curl_easy_init();
    string url="",res="";
    url = "http://book.weibo.com";
    cout << version;

    //抓取http數據
    curl_easy_setopt(curl,CURLOPT_URL,url.c_str());
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&res);
    curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION, myWrite);
    curl_easy_setopt(curl, CURLOPT_HEADER, 0);
    //超時，不接受其他信號
    curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 3);
    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 3);
    //執行
    curl_easy_perform(curl);
    //關閉
    curl_easy_cleanup(curl);
    //cout << version << endl;
    cout << res << endl;
}
//數據的獲取
size_t myWrite( void *ptr, size_t size, size_t nmemb, void *stream){
    string *str = dynamic_cast((string*)stream);
    if( 0 == size ||   NULL == ptr){
        return -1;
    }

    char* pData = (char*)ptr;
    str->append(pData,nmemb*size);
    return nmemb*size;
}

g++ tcurl.cpp -lcurl 運行即可

參考

libcurl的使用
http://blog.csdn.net/huyiyang2010/article/details/7664201
http://blog.chinaunix.net/uid-20692625-id-3203258.html
libcurl的函數說明
http://blog.csdn.net/w13770269691/article/details/8847800