cocos2d-x 3.1.1 学习笔记［11］ http请求 ＋ json解析

//http需要引入的头文件和命名空间#include <network/HttpClient.h>using namespace network;

//json需要引入的头文件#include <json/document.h>

    //然后声名两个函数    void http();//用于执行http请求    void onHttpRequestCompleted(cocos2d::network::HttpClient *sender, cocos2d::network::HttpResponse *response);// http请求的回调

void Nice::http(){    //创建一个get请求    HttpRequest* request = new HttpRequest();    request->setUrl("http://api.map.baidu.com/telematics/v3/weather?location=%E5%8C%97%E4%BA%AC&output=json&ak=Gk0Bbh9H4iREjesugyEqySN7");    request->setRequestType(HttpRequest::Type::GET);    request->setResponseCallback(CC_CALLBACK_2(Nice::onHttpRequestCompleted, this));    request->setTag("json");    HttpClient::getInstance()->send(request);    request->release();        //创建一个post请求    HttpRequest* request_post = new HttpRequest();    request_post->setUrl("http://httpbin.org/post");    request_post->setRequestType(HttpRequest::Type::POST);    std::vector<std::string> headers;    headers.push_back("Content-Type: application/json; charset=utf-8");    request_post->setHeaders(headers);    request_post->setResponseCallback(CC_CALLBACK_2(Nice::onHttpRequestCompleted, this));    //post数据    const char* postData = "visitor=cocos2d&TestSuite=Extensions Test/NetworkTest";    request_post->setRequestData(postData, strlen(postData));    request_post->setTag("POST test2");    HttpClient::getInstance()->send(request_post);    request_post->release();}void Nice::onHttpRequestCompleted(cocos2d::network::HttpClient *sender, cocos2d::network::HttpResponse *response){    if (!response) {        return;            }        if (0 != strlen(response->getHttpRequest()->getTag())) {        log("%s completed",response->getHttpRequest()->getTag());    }        long statusCode = response->getResponseCode();    char statusString[64] = {};        sprintf(statusString, "HTTP Status Code: %ld, tag = %s",statusCode,response->getHttpRequest()->getTag());    log("response code: %ld",statusCode);        if (!response->isSucceed()) {        log("response failed");        log("error buffer: %s",response->getErrorBuffer());        return;            }        std::vector<char>* buffer = response->getResponseData();    printf("Http Test, dump data: ");    for (unsigned int i = 0 ; i < buffer->size();i++) {        printf("%c",(*buffer)[i]);    }        //将std::vector(char)* 转换成 std::string的两种方法    std::string backStr = std::string(&(*buffer->begin()), buffer->size());    std::string anotherStr;    anotherStr.insert(anotherStr.begin(), buffer->begin(), buffer->end());    printf("%s\n", backStr.c_str());    printf("%s\n", anotherStr.c_str());    printf("\n");            if (strcmp(response->getHttpRequest()->getTag(), "json") == 0) {        rapidjson::Document doc;        doc.Parse<0>(backStr.c_str());        const rapidjson::Value& v = doc["status"];        printf("status is : %s",v.GetString());        const rapidjson::Value& dir = doc["results"];        if (dir.IsArray()) {            unsigned int i = 0;            const rapidjson::Value& city = dir[i]["currentCity"];            log("city is %s", city.GetString());            //多层测试            const rapidjson::Value& title = doc["results"][(unsigned int)0]["index"][(unsigned int)2]["title"];            log("the title is %s", title.GetString());        }    }        }