如何解析这个 JSON 文件？ (Qt)

Posted 2023-02-17

【中文标题】如何解析这个 JSON 文件？ (Qt)

【英文标题】：How to parse this JSON file? (Qt)

【发布时间】：2020-02-04 11:51:38

【问题描述】：

我正在使用 Qt5.7.1 并尝试读取我的 JSON 文件中的信息。 我的文件结构包括：配置名称、神经元个数、神经元数组（每个神经元都有严格数量的感受器和突触，也用数组表示）以及每个神经元的系数值他们。 我需要得到这些值。 我有这个 JSON 文件：

"Task config name": "Test",
"Configuration": 
    "NeuronsCount": 2,
    "Neurons": [
        
            "ReceptorsCount": 3,
            "Receptors": [
                
                    "coef1": 17.32,
                    "coef2": 11.992,
                    "coef3": 2.314
                ,
                
                    "coef1": 12.982,
                    "coef2": 96.148,
                    "coef3": -1.899
                ,
                
                    "coef1": 49.11,
                    "coef2": 35.001,
                    "coef3": -643.52
                
            ],

            "SynapsysCount": 4,
            "Synapses": [
                
                    "coef1": 13.22,
                    "coef2": 31.992,
                    "coef3": 22.314
                ,
                
                    "coef1": 12.81,
                    "coef2": 36.8,
                    "coef3": -53.189
                ,
                
                    "coef1": 1.11,
                    "coef2": 44.261,
                    "coef3": -23.12
                ,
                
                    "coef1": 642.86,
                    "coef2": 24.24,
                    "coef3": 95.009
                
            ]
        ,

        
            "ReceptorsCount": 3,
            "Receptors": [
                
                    "coef1": 6.32,
                    "coef2": 64.992,
                    "coef3": 98.314
                ,
                
                    "coef1": 42.982,
                    "coef2": 11.148,
                    "coef3": -12.899
                ,
                
                    "coef1": 1.11,
                    "coef2": 752.001,
                    "coef3": -3.82
                
            ],

            "SynapsysCount": 4,
            "Synapses": [
                
                    "coef1": 19.82,
                    "coef2": 1.592,
                    "coef3": 75.384
                ,
                
                    "coef1": 89.81,
                    "coef2": 65.8,
                    "coef3": -13.189
                ,
                
                    "coef1": 18.11,
                    "coef2": 11.261,
                    "coef3": -211.12
                ,
                
                    "coef1": 2.86,
                    "coef2": 8.24,
                    "coef3": 6.009
                
            ]
        
    ]

如何接收每个“受体”和“突触”的 coef# 值？ 我试过了，但它返回 0.. 如何读取这样的文件？

QByteArray data = jsonFile.readAll();
QJsonDocument document;
document = document.fromJson(data);
QJsonObject jsonObject = document.object();
QJsonArray neuronsArray = jsonObject.value("Neurons").toArray();
qDebug() << "Size = " << neuronsArray.size();

【参考方案1】：

您必须遍历 JSON 文档：

QJsonDocument doc = QJsonDocument::fromJson(file.readAll());
QJsonObject root = doc.object();
QJsonObject conf = root.value("Configuration").toObject();
//this gives you the neurons array, in there you have objects which you can access just like above
QJsonArray arr = conf.value("Neurons").toArray();