用于IEX市场数据的C ++ http客户端

Question

黑客马拉松助手代码

说明： 1）通过执行以下命令进行编译：g ++ main.cpp -ljsoncpp -lcurl 2）运行在工作目录中创建的可执行文件：./a.exe

有用的资源： http://jsoncpp.sourceforge.net/class_json_1_1_value.html

---

对我来说： Using libCurl and JsonCpp to parse from https webserver

#include <iostream>
#include <string>

using namespace std;

class StockData {
private:
  string symbol;
  double marketPercent;
  int bidSize;
  double bidPrice;
  int askSize;
  double askPrice;
  int volume;
  double lastSalePrice;
  int lastSaleSize;
  long lastSaleTime;
  long lastUpdated;
  string sector;
  string securityType;

public:
  StockData(string symbol, double marketPercent, int bidSize, double bidPrice, int askSize, double askPrice,
            int volume, double lastSalePrice, int lastSaleSize, long lastSaleTime, long lastUpdated, string sector, string securityType) :
                symbol(symbol),
                marketPercent(marketPercent),
                bidSize(bidSize),
                bidPrice(bidPrice),
                askSize(askSize),
                askPrice(askPrice),
                volume(volume),
                lastSalePrice(lastSalePrice),
                lastSaleSize(lastSaleSize),
                lastSaleTime(lastSaleTime),
                lastUpdated(lastUpdated),
                sector(sector),
                securityType(securityType) {}

  //Read-only getters
  string getSymbol() const { return symbol; }
  double getMarketPercent() const { return marketPercent; }
  int getBidSize() const { return bidSize; }
  double getBidPrice() const { return bidPrice; }
  int getAskSize() const { return askSize; }
  double getAskPrice() const{ return askPrice; }
  int getVolume() const { return volume; }
  double getLastSalePrice() const { return lastSalePrice; }
  int getLastSaleSize() const { return lastSaleSize; }
  long getLastSaleTime() const { return lastSaleTime; }
  long getLastUpdated() const { return lastUpdated; }
  string getSector() const { return sector; }
  string getSecurityType() const { return securityType; }
};

#include <cstdint>
#include <iostream>
#include <memory>
#include <string>
#include <curl/curl.h>
#include <json/json.h>
#include <vector>
#include "StockData.cpp"
using namespace std;

class StockDataProvider {
private:
  CURL *curl;
  CURLcode res;
  Json::Value jsonData;
  Json::Reader jsonReader;
  const string BASE_URL="https://api.iextrading.com/1.0/tops?symbols=";

public:
  static size_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp)
  {
      ((std::string*)userp)->append((char*)contents, size * nmemb);
      return size * nmemb;
  }

  string getJSON(string url) {
      string readBuffer;
      curl = curl_easy_init();

      if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);

        return readBuffer;
      }

      return 0;
  }



  vector<StockData> getStockData(string stockSymbols[]) {
    const int size = sizeof(stockSymbols)/sizeof(stockSymbols[0]);
    string url = createUrl(stockSymbols, size);
    string jsonString = getJSON(url);

    /*
    * TODO: Implement the jsonParsing using jsoncpp to create the objects
    */

  }



/* Use the jsonData to parse through JSON reponse and create StockData objects */
  void parseJson(string jsonString) {
    if (jsonReader.parse(jsonString, jsonData))
    {
      cout << "Successfully parsed JSON data" << endl;
      cout << "\nJSON data received:" << endl;
      cout << jsonData.toStyledString() << endl;
      //Need to parse data here!
    }
    else
    {
      cout << "Could not parse HTTP data as JSON" << endl;
      cout << "HTTP data was:\n" << jsonString << endl;
    }
  }



  string createUrl(string stockSymbols[], int size) {
    string url = BASE_URL;

    for(int i = 0; i < size; i++) {
        url += stockSymbols[i];
        if(i < size-1) {
          url += ',';
        }
    }
    return url;
  }

};

#include "StockDataProvider.cpp"
using namespace std;

int main() {
  string URL = "https://api.iextrading.com/1.0/tops?symbols=SNAP,FB";

  StockDataProvider stockDataProvider;
  string stockSymbols[] = {"SNAP", "FB"};
  string newURL = stockDataProvider.createUrl(stockSymbols, 2);
  string responseData = stockDataProvider.getJSON(URL);
  stockDataProvider.parseJson(responseData);
  cout << "Response: " << responseData << endl;

  return 0;
}