Json字符串与QVariantList 对象相互转换

在Qt中QVariantList 使用起来很方便，如果涉及到数据的传输，需要将QVariantList 数据转换为JsonArray字符串，这个转换Qt已经实现好了，只需要调用接口就可以完成转换，代码如下：

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转为Jsonarray字符串
    QJsonArray jsonArray = QJsonArray::fromVariantList(QVarList);

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

    //Jsonarray字符串转为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();
}

执行结果：

为了方便看，手动把执行结果的格式调整了下，加了换行。

​
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"))))
)​

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