Question

我目前正在开展涉及我使用The Open Movie Database API的学校项目。我觉得我的请求有效，但我似乎无法将标题，年份等信息显示在UI甚至控制台中。我试着在Qt中寻找关于JSON的教程，但我找不到任何有用的东西。任何帮助都会很棒！

我要拉什么：

void MainWindow::sendRequest(){
    QEventLoop eventLoop;
    QNetworkAccessManager manager;

    QObject::connect(&manager, SIGNAL(finished(QNetworkReply*)), &eventLoop, SLOT(quit()));
    QNetworkRequest req(QUrl(QString("http://www.omdbapi.com/?t=Scarface")));
    QNetworkReply *reply = manager.get(req);
    eventLoop.exec();

}

Answer 1

要解码数据，您可以使用QJsonDocument，QJsonObject，QJsonArray：

#include <QEventLoop>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QDebug>
#include <QJsonDocument>
#include <QJsonArray>
#include <QJsonObject>

void MainWindow::sendRequest()
{
    QEventLoop eventLoop;
    QNetworkAccessManager manager;

    connect(&manager, SIGNAL(finished(QNetworkReply*)), &eventLoop, SLOT(quit()));
    QNetworkRequest req(QUrl("http://www.omdbapi.com/?t=Scarface"));
    QNetworkReply *reply = manager.get(req);
    eventLoop.exec();
    QJsonDocument document = QJsonDocument::fromJson(reply->readAll());

    if(document.isObject()){
        QJsonObject valuesO = document.object();

        for(auto key: valuesO.keys()){
            qDebug()<<key<<" : "<<valuesO[key].toString();
        }
        // access by particular key
        //qDebug() << valuesO["Actors"].toString();
    }

}

输出：

"Actors"  :  "Al Pacino, Steven Bauer, Michelle Pfeiffer, Mary Elizabeth Mastrantonio"
"Awards"  :  "Nominated for 3 Golden Globes. Another 4 nominations."
"BoxOffice"  :  "$656,161.00"
"Country"  :  "USA"
"DVD"  :  "30 Sep 2003"
"Director"  :  "Brian De Palma"
"Genre"  :  "Crime, Drama"
"Language"  :  "English, Spanish"
"Metascore"  :  "65"
"Plot"  :  "In Miami in 1980, a determined Cuban immigrant takes over a drug cartel and succumbs to greed."
"Poster"  :  "https://images-na.ssl-images-amazon.com/images/M/MV5BNjdjNGQ4NDEtNTEwYS00MTgxLTliYzQtYzE2ZDRiZjFhZmNlXkEyXkFqcGdeQXVyNjU0OTQ0OTY@._V1_SX300.jpg"
"Production"  :  "Universal Films"
"Rated"  :  "R"
"Ratings"  :  ""
"Released"  :  "09 Dec 1983"
"Response"  :  "True"
"Runtime"  :  "170 min"
"Title"  :  "Scarface"
"Type"  :  "movie"
"Website"  :  "N/A"
"Writer"  :  "Oliver Stone (screenplay)"
"Year"  :  "1983"
"imdbID"  :  "tt0086250"
"imdbRating"  :  "8.3"
"imdbVotes"  :  "572,774"

问：如何从OMDb API中提取JSON请求

1 个答案: