Json字符串與QVariantList 對象相互轉換

在Qt中QVariantList 使用起來很方便，如果涉及到數據的傳輸，需要將QVariantList 數據轉換爲JsonArray字符串，這個轉換Qt已經實現好了，只需要調用接口就可以完成轉換，代碼如下：

main.cpp

#include <QCoreApplication>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonValue>
#include <QJsonObject>

#include <QVariantMap>
#include <QVariantList>
#include <QDebug>


int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QVariantList QVarList;

    QVariantMap tmpvm;
    for ( int i = 0; i < 3; i ++ )
    {
        tmpvm.clear();
        tmpvm["name"] = QString("Test%1").arg(i);
        tmpvm["no"] = QString::number(i);

        QVarList<<tmpvm;
    }

    qDebug()<<"qvarList: "<<QVarList;


    //QVariantList轉爲Jsonarray字符串
    QJsonArray jsonArray = QJsonArray::fromVariantList(QVarList);

    QJsonDocument jsonDoc(jsonArray);
    qDebug()<<"------------------------------QVariantList to json-------------------------------";
    qDebug() << jsonDoc.toJson();

    //Jsonarray字符串轉爲QVariantList
    QString str = "[{\"no\": \"1\", \"name\": \"Jack\"},{\"no\": \"2\", \"name\": \"Tom\"},{\"no\": \"3\", \"name\": \"Stans\"}]";
    QJsonDocument json = QJsonDocument::fromJson(str.toLatin1());
    qDebug()<<"------------------------------json to QVariantList-------------------------------";

    qDebug()<<"qvarList: "<<json.array().toVariantList();;


    return a.exec();
}

 

執行結果：

爲了方便看，手動把執行結果的格式調整了下，加了換行。

​
qvarList:  
(
QVariant(QVariantMap, QMap(("name", QVariant(QString, "Test0"))("no", QVariant(QString, "0")))), 
QVariant(QVariantMap, QMap(("name", QVariant(QString, "Test1"))("no", QVariant(QString, "1")))), 
QVariant(QVariantMap, QMap(("name", QVariant(QString, "Test2"))("no", QVariant(QString, "2"))))
)
​
------------------------------QVariantList to json-------------------------------
"[ 
{ "name": "Test0", "no": "0" }, 
{ "name": "Test1", "no": "1" }, 
{ "name": "Test2", "no": "2" }
]"
------------------------------json to QVariantList-------------------------------
qvarList:  
(
QVariant(QVariantMap, QMap(("name", QVariant(QString, "Jack"))("no", QVariant(QString, "1")))), 
QVariant(QVariantMap, QMap(("name", QVariant(QString, "Tom"))("no", QVariant(QString, "2")))),
QVariant(QVariantMap, QMap(("name", QVariant(QString, "Stans"))("no", QVariant(QString, "3"))))
)​

微信公衆號：