Qt每天一例13.枚举转字符串

Posted 2022-01-17 鱼酱2333

Qt枚举转字符串

示例代码

#include<QMetaEnum>

class Demo:public QObject

    Q_OBJECT
public:
    enum EnmState
        ENM_STATE_A = 0,
        ENM_STATE_B = 2,
        ENM_STATE_C,
        ENM_STATE_D,
    ;
    Q_ENUM(EnmState);


    void show()
    

       QMetaEnum enmState = QMetaEnum::fromType<Demo::EnmState>();
       qDebug()<<enmState.name();//枚举的类型名称
       qDebug()<<enmState.keyCount();//键个数
       qDebug()<<enmState.isValid()<<enmState.scope();//是否有效 声明自哪个类
       qDebug()<<enmState.keyToValue("ENM_STATE_A"); //字符串转枚举
       qDebug()<<QString(enmState.valueToKey(ENM_STATE_A)); //枚举转字符串
       qDebug()<<QString(enmState.valueToKey(ENM_STATE_B));
       for(int i = 0;i < enmState.keyCount();i++) //遍历枚举
           qDebug()<<QString(enmState.key(i))<<enmState.value(i);
       
    

;

EnmState
4
true Demo
0
“ENM_STATE_A”
“ENM_STATE_B”
“ENM_STATE_A” 0
“ENM_STATE_B” 2
“ENM_STATE_C” 3
“ENM_STATE_D” 4

• 模板类

class CEnmDef:public QObject
    Q_OBJECT
public:
     enum EnmDevSwitch
         ENM_SWITCH_ON = 0,
         ENM_SWITCH_OFF,
     ;
    Q_ENUM(EnmDevSwitch)
    
    template <typename EnmType>
    static EnmType strToEnm(QString strText)
    
          QMetaEnum metaEnm = QMetaEnum::fromType<EnmType>();
          return (EnmType)metaEnm.keyToValue(strText.toStdString().data());
    
    template <typename EnmType>
    static QString enmToStr(EnmType enmVal)
    
        QMetaEnum metaEnm = QMetaEnum::fromType<EnmType>();
        return metaEnm.valueToKey(enmVal);