欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

c++爬虫大众点评数据

程序员文章站 2022-06-23 16:34:57
#include < curl / curl.h > #include < iostream > #include < stdio.h >...
#include < curl / curl.h >

#include < iostream >

#include < stdio.h >

#include < string.h >

#include < pcre.h >

#define oveccount 30
/* should be a multiple of 3 */

#define ebuflen 128

#define buflen 10240

using namespacestd;

size_t onwritedata(void * buffer, size_t size, size_t nmemb, void * str) {

    if (!str || !buffer) {

        return - 1;

    }

    string * result = (string * ) str;

    result - >append((char * ) buffer, size * nmemb);

    return nmemb;

}

//获取页面
int getweb(string url, string & result)

{

    long code = 0;

    string htmlpage;

    curl * curl = curl_easy_init();

    curl_easy_setopt(curl, curlopt_url, url.c_str()); //设置url
    curl_easy_setopt(curl, curlopt_post, 0); //设置请求方法
    curl_easy_setopt(curl, curlopt_useragent, "mozilla/5."); //伪装客户端
    curl_easy_setopt(curl, curlopt_writedata, &htmlpage); //设置接受返回结果字符串
    curl_easy_setopt(curl, curlopt_writefunction, onwritedata); //设置处理方法
    curl_easy_perform(curl); //请求
    curl_easy_getinfo(curl, curlinfo_response_code, &code);

    if (code == 200)

    {

        cout << "request success" << endl;

        result = htmlpage;

        //cout<<htmlpage<<endl;

    }

    curl_easy_cleanup(curl);

    return code;

}

int main(int argc, char * *argv)

{

    pcre * re;

    constchar * error;

    int erroffset;

    int ovector[oveccount];

    int rc,
    i;

    string url = "https://www.dianping.com/search/category/212/10/g103";

    string html;

    getweb(url, html);

    //char src[] =   " ";
    //char pattern[] = "(<a>.+?</a>)";

    constchar * src = html.c_str();

    char pattern[] = "(<li class=\"\"[\\s\\s]*?</li>)";

    printf("string : %s\n", src);

    printf("pattern: \"%s\"\n", pattern);

    re = pcre_compile(pattern, 0, &error, &erroffset, null);

    if (re == null) {

        printf("pcre compilation failed at offset %d: %s\n", erroffset, error);

        return1;

    }

    char * p = (char * ) src;

    while ((rc = pcre_exec(re, null, p, strlen(p), 0, 0, ovector, oveccount)) != pcre_error_nomatch)

    {

        printf("\nok, %d matched ...\n\n", rc);

        for (i = 0; i < rc - 1; i++)

        {

            char * substring_start = p + ovector[2 * i];

            int substring_length = ovector[2 * i + 1] - ovector[2 * i];

            char matched[10240];

            memset(matched, 0, 10240);

            strncpy(matched, substring_start, substring_length);

            printf("match:%s\n", matched);

        }

        p += ovector[1];

        if (!p)

        {

            break;

        }

    }

    pcre_free(re);

    return0;

}