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crow

crow和flask都是web框架，能够快速搭建web server服务

#include "crow.h"

int main()
{
    
    crow::SimpleApp app;

    CROW_ROUTE(app, "/")([](){
    
        return "Hello world";
    });
    CROW_ROUTE(app,"/hello/<int>")
      ([](int count){
    
       if (count > 100)
       return crow::response(400);
       std::ostringstream os;
       os << count << " bottles of beer!";
       return crow::response(os.str());
       });
    CROW_ROUTE(app, "/params")
       ([](const crow::request& req){
    
          std::ostringstream os;
          os << "Params: " << req.url_params << "\n\n"; 
          os << "The key 'foo' was " << (req.url_params.get("foo") == nullptr ? "not " : "") << "found.\n";
          if(req.url_params.get("pew") != nullptr) {
    
              double countD = boost::lexical_cast<double>(req.url_params.get("pew"));
              os << "The value of 'pew' is " <<  countD << '\n';
          }
          auto count = req.url_params.get_list("count");
          os << "The key 'count' contains " << count.size() << " value(s).\n";
          for(const auto& countVal : count) {
    
              os << " - " << countVal << '\n';
          }
          return crow::response{
    os.str()};
          }); 

    app.port(18080).multithreaded().run();
}

curl库

#include <stdio.h>
#include <curl/curl.h>
bool getUrl(char *filename)
{
    
    CURL *curl;
    CURLcode res;
    FILE *fp;
    if ((fp = fopen(filename, "w")) == NULL)  // 返回结果用文件存储
        return false;
    struct curl_slist *headers = NULL;
    headers = curl_slist_append(headers, "Accept: Agent-007");
    curl = curl_easy_init();    // 初始化
    if (curl)
    {
    
        //curl_easy_setopt(curl, CURLOPT_PROXY, "10.99.60.201:8080");// 代理
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);// 改协议头
        curl_easy_setopt(curl, CURLOPT_URL,"http://www.baidu.com");
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); //将返回的http头输出到fp指向的文件
        curl_easy_setopt(curl, CURLOPT_HEADERDATA, fp); //将返回的html主体数据输出到fp指向的文件
        res = curl_easy_perform(curl);   // 执行
        if (res != 0) {
    

            curl_slist_free_all(headers);
            curl_easy_cleanup(curl);
        }
        fclose(fp);
        return true;
    }
}
bool postUrl(char *filename)
{
    
    CURL *curl;
    CURLcode res;
    FILE *fp;
    if ((fp = fopen(filename, "w")) == NULL)
        return false;
    curl = curl_easy_init();
    if (curl)
    {
    
        curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "/tmp/cookie.txt"); // 指定cookie文件
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "&logintype=uid&u=xieyan&psw=xxx86");    // 指定post内容
        //curl_easy_setopt(curl, CURLOPT_PROXY, "10.99.60.201:8080");
        curl_easy_setopt(curl, CURLOPT_URL, " http://mail.sina.com.cn/cgi-bin/login.cgi ");   // 指定url
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
    }
    fclose(fp);
    return true;
}
int main(void)
{
    
    getUrl("/tmp/get.html");
    postUrl("/tmp/post.html");
}

struct curl_httppost* post;
struct curl_httpposr* last;
curl_formadd(&post,&last,CURLFROM_COPYNAME,"image_file",CURLFROM_BUFFER,"data"
,CURLFROM_BUFFERPTR,fram_encoder_str.c_str(),CURLFROM_BUFFERLENGTH,
fram_encoder.length(),CURLFROM_END);
curl_formadd(&post,&last,CURLFROM_COPYNAME,"json_str",CURLFROM_BUFFER
,CURLFROM_COPYCONTENTS,json.dump().c_str(),CURLFROM_END);
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,write_data_json);
size_t write_data_json(void* ptr,size_t size ,size_t nmeb,void* stream)
{
    
std::string data((const char*) ptr,(size_t)size*nmeb);
*(std::stringsream *)stream<<data<<endl;
return size*nmeb;

} 

三级目录