qt5 解析Json文件

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/* test.json */{   "appDesc": {      "description": "SomeDescription",      "message": "SomeMessage"   },   "appName": {      "description": "Home",      "message": "Welcome",      "imp":["awesome","best","good"]   }}void readJson()   {      QString val;      QFile file;      file.setFileName("test.json");      file.open(QIODevice::ReadOnly | QIODevice::Text);      val = file.readAll();      file.close();      qWarning() << val;      QJsonDocument d = QJsonDocument::fromJson(val.toUtf8());      QJsonObject sett2 = d.object();      QJsonValue value = sett2.value(QString("appName"));      qWarning() << value;      QJsonObject item = value.toObject();      qWarning() << tr("QJsonObject of description: ") << item;      /* incase of string value get value and convert into string*/      qWarning() << tr("QJsonObject[appName] of description: ") << item["description"];      QJsonValue subobj = item["description"];      qWarning() << subobj.toString();      /* incase of array get array and convert into string*/      qWarning() << tr("QJsonObject[appName] of value: ") << item["imp"];      QJsonArray test = item["imp"].toArray();      qWarning() << test[1].toString();   }

http://stackoverflow.com/questions/15893040/how-to-create-read-write-json-files-in-qt5

摘于上面的链接，大部分已经能用了。

我来说下其他情况：

{"file":"book.png","frames":{"v1":{"x":1,"y":91,"w":68,"h":87,"offX":0,"offY":0,"sourceW":68,"sourceH":87},"v2":{"x":1,"y":1,"w":68,"h":88,"offX":0,"offY":0,"sourceW":68,"sourceH":88},"v3":{"x":209,"y":1,"w":66,"h":87,"offX":0,"offY":0,"sourceW":66,"sourceH":87},"v4":{"x":71,"y":1,"w":67,"h":88,"offX":0,"offY":0,"sourceW":67,"sourceH":88},"v5":{"x":71,"y":91,"w":67,"h":88,"offX":0,"offY":0,"sourceW":67,"sourceH":88},"v6":{"x":140,"y":1,"w":67,"h":87,"offX":0,"offY":0,"sourceW":67,"sourceH":87},"v7":{"x":140,"y":90,"w":67,"h":87,"offX":0,"offY":0,"sourceW":67,"sourceH":87}}}

像这样的json，想要得到frames里所有的内容，因为它不是一个数组，所以要用迭代器来访问，类似这样的代码：

bool MainWindow::parseJsonFile(){    QString val;    QFile file;    file.setFileName("test.json");    file.open(QIODevice::ReadOnly | QIODevice::Text);    val = file.readAll();    file.close();    qWarning() << val;    QJsonDocument d = QJsonDocument::fromJson(val.toUtf8());    QJsonObject rootObject = d.object();    QJsonValue pngNameJsonValue = rootObject.value(QString("file"));    qWarning() << pngNameJsonValue.toString();    QJsonValue framesJsonValue = rootObject.value(QString("frames"));    qWarning() << framesJsonValue;    QStringList imgNameList = framesJsonValue.toObject().keys();    QJsonObject frameObject = framesJsonValue.toObject();    int index = 0;    for(auto beginItr = frameObject.begin(); beginItr != frameObject.end(); ++beginItr){       QJsonValue eachImageJsonValue = *beginItr;       QJsonObject eachImageJsonObject = eachImageJsonValue.toObject();            //eachImageJsonObject["x"], eachImageJsonObject["y"] ...    }    return true;}

还有QJsonValue里用.keys()得到所有的key，然后就可以通过["key"] 来访问了。

http://www.waitingfy.com/archives/1775

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