Json字符串与QVariantList 对象相互转换

傷城~ 2023-03-06 03:33 14阅读 0赞

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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