QJson生成文件和解析文件

QJson生成.json文件

生成简单的json文件

    QVariantHash data;
    QVariantHash patientData;
    patientData.insert("patient ID","22334");
    patientData.insert("Name","ZYL_YY");
    patientData.insert("age","26");
    patientData.insert("clinicalData","wwwww");
    patientData.insert("Selected site","lever");
    patientData.insert("Selected mode","pulse mode");
    data.insert("patientInformation",patientData);
     QJsonObject rootobj = QJsonObject::fromVariantHash(data);
    QJsonDocument document;
    document.setObject(rootobj);
    QByteArray byte_array = document.toJson();
    QString json_str = (byte_array);
    QFile file("/home/wxh1/1.json");
    if(!file.open(QIODevice::ReadWrite | QIODevice::Text | QIODevice::Truncate))
    {
        qDebug()<<"file error";
    }
    QTextStream in(&file);
    in<<json_str;
    file.close();

生成的jison文件

{
    "patientInformation": {
        "Name": "ZYL_YY",
        "Selected mode": "pulse mode",
        "Selected site": "lever",
        "age": "26",
        "clinicalData": "wwwww",
        "patient ID": "22334"
    }
}

解析json文件QFile file("/home/wxh1/1.json");

//
file.open(QIODevice::ReadOnly | QIODevice::Text);
//

QString value = file.readAll();
file.close();
//
QJsonParseError jsonError;
QJsonDocument doucement = QJsonDocument::fromJson(value.toUtf8(),&jsonError);
//
if(!doucement.isNull()&&(jsonError.error == QJsonParseError::NoError))
{
   //
   if(doucement.isObject())
   {
      //
       _jsonObject = doucement.object();
       QVector<QString> patien_item(6);
      //
      if(_jsonObject.contains("patientInformation"))
      {
        //
        QJsonValue jsonValueList = _jsonObject.value(QStringLiteral("patientInformation"));
        QJsonObject item = jsonValueList.toObject();
        //
        patien_item[0]=item["Name"].toString();
        patien_item[1]=item["Selected mode"].toString();
        patien_item[2]=item["Selected site"].toString();
        patien_item[3]=item["patient ID"].toString();
        patien_item[4]=item["age"].toString();
        patien_item[5]=item["clinicalData"].toString();
      }
    }
 }

构建json数组

  QJsonArray probePlacementData;
    for(int i =0;i<5;i++)
    {
        QJsonObject obj;
        obj.insert("voltage","3000");
        obj.insert("distance","2.4");
        obj.insert("pulseLength","100");
        obj.insert("numpulse","90");
        probePlacementData.append(obj);

    }
    data.insert("probePlacementData",probePlacementData);

    QJsonObject rootobj = QJsonObject::fromVariantHash(data);
    QJsonDocument document;
    document.setObject(rootobj);
    QByteArray byte_array = document.toJson();
    QString json_str = (byte_array);
    QFile file("/home/wxh1/1.json");
    if(!file.open(QIODevice::ReadWrite | QIODevice::Text | QIODevice::Truncate))
    {
        qDebug()<<"file error";
    }
    QTextStream in(&file);
    in<<json_str;
    file.close();

　生成的json文件

{
    "probePlacementData": [
        {
            "distance": "2.4",
            "numpulse": "90",
            "pulseLength": "100",
            "voltage": "3000"
        },
        {
            "distance": "2.4",
            "numpulse": "90",
            "pulseLength": "100",
            "voltage": "3000"
        },
        {
            "distance": "2.4",
            "numpulse": "90",
            "pulseLength": "100",
            "voltage": "3000"
        },
        {
            "distance": "2.4",
            "numpulse": "90",
            "pulseLength": "100",
            "voltage": "3000"
        },
        {
            "distance": "2.4",
            "numpulse": "90",
            "pulseLength": "100",
            "voltage": "3000"
        }
    ]
}

　解析json文件

struct _probePlacementDataStruct
{
    QString voltage;
    QString distance;
    QString pulseLegth;
    QString numpulse;
};

QFile file("/home/wxh1/1.json");
//
file.open(QIODevice::ReadOnly | QIODevice::Text);
//

QString value = file.readAll();
file.close();
//
QJsonParseError jsonError;
QJsonDocument doucement = QJsonDocument::fromJson(value.toUtf8(),&jsonError);
//
if(!doucement.isNull()&&(jsonError.error == QJsonParseError::NoError))
{
   //
   if(doucement.isObject())
   {
       //
       _jsonObject = doucement.object();
       if(_jsonObject.contains(QStringLiteral("probePlacementData")))
       {
        QJsonValue arrayVaule = _jsonObject.value(QStringLiteral("probePlacementData"));
        if(arrayVaule.isArray())
        {
            QJsonArray array = arrayVaule.toArray();
            for(int i = 0;i<array.size();i++)
            {
                QJsonValue iconArray = array.at(i);
                QJsonObject  childrens = iconArray.toObject();
                QString pAdd = childrens["P+"].toString();
                QString pdec = childrens["P-"].toString();
                QString voltage = childrens["voltage"].toString();
                QString distance = childrens["distance"].toString();
                QString pulseLength = childrens["pulseLength"].toString();
                QString numPulse = childrens["numpulse"].toString();
                QString v_cm = childrens["v/cm"].toString();
                _probePlacementDataStruct list;
                list.voltage = voltage;
                list.distance = distance;
                list.pulseLegth = pulseLength;
                list.numpulse = numPulse;
            }
        }
     }
   }
 }

原文地址：https://www.cnblogs.com/wxh-53919/p/10910495.html