示例

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QT += network

#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>

//创建
void init()
{
    QNetworkAccessManager* manager = new QNetworkAccessManager(this);
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));//关联信号和槽
}

//请求，以天气预报为例
void queryWeather()
{
    char quest_array[256]="http://wthrcdn.etouch.cn/weather_mini?city=";
    QNetworkRequest quest;
    sprintf(quest_array,"%s%s",quest_array,cityName.toUtf8().data());
    quest.setUrl(QUrl(quest_array));
    quest.setHeader(QNetworkRequest::UserAgentHeader,"RT-Thread ART");
    /*发送get网络请求*/
    manager->get(quest);
}

//响应
void replyFinished(QNetworkReply *reply)
{
    allinfo = reply->readAll();
    qDebug()<<"allinfo："<<allinfo;
    
    QJsonParseError err;
    QJsonDocument json_recv = QJsonDocument::fromJson(allinfo.toUtf8(),&err);//解析json对象
    qDebug() <<"Json-Error:"<< err.error;
    if(!json_recv.isNull())
    {
        QJsonObject object = json_recv.object();
    }
}