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#include <QCoreApplication>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QDebug>
class Source
{
public:
Source() {
QJsonObject jsonObj;
jsonObj["name"] = "John Doe";
jsonObj["address"] = "Some street\\nCity\\nCountry";
jsonObj["year"] = 2024;
jsonObj["age"] = 30.57;
jsonObj["married"] = false;
QJsonObject childObj;
childObj["company"] = "KDAB";
childObj["title"] = "Surface technician";
childObj["emptyObj"] = QJsonObject();
childObj["emptyArray"] = QJsonArray();
childObj["emptyValue"] = QJsonValue();
jsonObj["job"] = childObj;
QJsonArray children;
children.append("Alice");
children.append("Mickaël");
jsonObj["children"] = children;
m_jsonDoc = QJsonDocument(jsonObj);
}
Q_NEVER_INLINE QJsonDocument jsonDocument();
Q_NEVER_INLINE QJsonObject jsonObject();
Q_NEVER_INLINE QJsonValue jsonValue();
Q_NEVER_INLINE QJsonArray childrenArray();
private:
QJsonDocument m_jsonDoc;
};
QJsonDocument Source::jsonDocument() { return m_jsonDoc; }
QJsonObject Source::jsonObject() { return m_jsonDoc.object(); }
QJsonValue Source::jsonValue() { return m_jsonDoc.object(); }
QJsonArray Source::childrenArray() { return m_jsonDoc.object()["children"].toArray(); }
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QJsonDocument emptyDoc;
Source source;
QJsonDocument jsonDoc = source.jsonDocument();
QJsonObject jsonObj = jsonDoc.object();
QByteArray jsonString = jsonDoc.toJson(QJsonDocument::Indented);
// Parsing JSON string back to QJsonDocument
QJsonDocument parsedDoc = QJsonDocument::fromJson(jsonString);
// Clear the very long string after use to prevent overly wide Value column in
// KDevelop's Variables tool view, which moves the Type column far to the right.
jsonString.clear();
// Check if the parsing was successful
if (!parsedDoc.isNull() && parsedDoc.isObject()) {
QJsonObject parsedObj = parsedDoc.object();
// Output parsed JSON object
QString nameStr = "name";
const auto nameRef = parsedObj[nameStr];
const QJsonValue name = nameRef;
const auto yearRef = parsedObj["year"];
const QJsonValue year = yearRef;
const auto ageRef = parsedObj["age"];
const QJsonValue age = ageRef;
const auto marriedRef = parsedObj["married"];
const QJsonValue married = marriedRef;
const auto parsedChildrenRef = parsedObj["children"];
const QJsonValue parsedChildrenValue = parsedChildrenRef;
QJsonArray parsedChildren = parsedChildrenRef.toArray();
const QJsonDocument childrenDoc(parsedChildren);
for (const auto &child : parsedChildren) {
QString childName = child.toString();
}
} else {
qCritical() << "Failed to parse JSON string.";
return 1;
}
return 0;
}
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