因此,我一直在互联网上寻找使用 libcurl 和 jsoncpp 解析 JSON 的基本示例,但一直找不到。
有人可以指出正确的方向或在这里指定,一个使用 libcurl 和 jsoncpp 的简单示例,从指定网页下载 json(链接本身以 .json 结尾,因此它将直接拉取 json)解析它并打印出来。
感谢所有帮助。谢谢!
尤登
最佳答案
这是一个独立的示例,用于 a) 通过 libcurl HTTP GET JSON 对象,然后 b) 使用 JsonCpp 解析它。 @WhozCraig 说这是两个完全独立的事件是正确的,但我碰巧有一个项目同时执行这两项事件,所以我汇总了这个从 this nifty page 中获取和解析 JSON 的小样本。 .
如果您将这段代码放在名为 main.cpp
的文件中,那么您可以编译、链接和运行(假设 libcurl 和 libjsoncpp 在您的路径上可用):
g++ main.cpp -ljsoncpp -lcurl -o example.out && ./example.out
// main.cpp
#include <cstdint>
#include <iostream>
#include <memory>
#include <string>
#include <curl/curl.h>
#include <json/json.h>
namespace
{
std::size_t callback(
const char* in,
std::size_t size,
std::size_t num,
std::string* out)
{
const std::size_t totalBytes(size * num);
out->append(in, totalBytes);
return totalBytes;
}
}
int main()
{
const std::string url("http://date.jsontest.com/");
CURL* curl = curl_easy_init();
// Set remote URL.
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
// Don't bother trying IPv6, which would increase DNS resolution time.
curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
// Don't wait forever, time out after 10 seconds.
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10);
// Follow HTTP redirects if necessary.
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
// Response information.
int httpCode(0);
std::unique_ptr<std::string> httpData(new std::string());
// Hook up data handling function.
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, callback);
// Hook up data container (will be passed as the last parameter to the
// callback handling function). Can be any pointer type, since it will
// internally be passed as a void pointer.
curl_easy_setopt(curl, CURLOPT_WRITEDATA, httpData.get());
// Run our HTTP GET command, capture the HTTP response code, and clean up.
curl_easy_perform(curl);
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpCode);
curl_easy_cleanup(curl);
if (httpCode == 200)
{
std::cout << "\nGot successful response from " << url << std::endl;
// Response looks good - done using Curl now. Try to parse the results
// and print them out.
Json::Value jsonData;
Json::Reader jsonReader;
if (jsonReader.parse(*httpData, jsonData))
{
std::cout << "Successfully parsed JSON data" << std::endl;
std::cout << "\nJSON data received:" << std::endl;
std::cout << jsonData.toStyledString() << std::endl;
const std::string dateString(jsonData["date"].asString());
const std::size_t unixTimeMs(
jsonData["milliseconds_since_epoch"].asUInt64());
const std::string timeString(jsonData["time"].asString());
std::cout << "Natively parsed:" << std::endl;
std::cout << "\tDate string: " << dateString << std::endl;
std::cout << "\tUnix timeMs: " << unixTimeMs << std::endl;
std::cout << "\tTime string: " << timeString << std::endl;
std::cout << std::endl;
}
else
{
std::cout << "Could not parse HTTP data as JSON" << std::endl;
std::cout << "HTTP data was:\n" << *httpData.get() << std::endl;
return 1;
}
}
else
{
std::cout << "Couldn't GET from " << url << " - exiting" << std::endl;
return 1;
}
return 0;
}
输出如下:
Got successful response from http://date.jsontest.com/ Successfully parsed JSON data JSON data received: { "date" : "03-09-2015", "milliseconds_since_epoch" : 1425938476314, "time" : "10:01:16 PM" } Natively parsed: Date string: 03-09-2015 Unix timeMs: 1425938476314 Time string: 10:01:16 PM
关于c++ - 使用 libCurl 和 JsonCpp 从 https 网络服务器解析,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24884490/