Q_OBJECT宏是Qt框架中的一个核心宏,它必须在所有继承自QObject或其子类的类声明中使用。这个宏为类启用了Qt的元对象系统(MetaObject System),该系统提供了信号与槽(signals and slots)机制、对象名称(object names)、属性系统(properties)以及动态对象创建等功能。简而言之,Q_OBJECT宏使得类能够利用Qt提供的许多高级...
简介: error : Class declarations lacks Q_OBJECT macro 直译是:类声明没有Q_OBJECT 宏。 class CError1 : public QObject { signals: void OnButClicked(); }; class CError2 : public QObject { signals: void OnButClicked(); }; class CError1 : public QObject { Q_OBJECT signals: void On...
直译是:类声明没有Q_OBJECT 宏。 class CError1 : public QObject { signals: void OnButClicked(); }; class CError2 : public QObject { signals: void OnButClicked(); }; class CError1 : public QObject { Q_OBJECT signals: void OnButClicked(); }; 类声明加上Q_OBJECT就好了。 class CE...
1. 问题的引出 最近在练习信号和槽的知识,在学习的过程中,报了如下截图所示的错误: 根据报错可知:未添加 Q_OBJECT宏. 2. 问题的解决 只有加入了Q_OBJECT,你才能使用QT中的signal和slot机制。为了使用信号和槽,就必须继承Q_OBJECT. 凡是QObject类(不管是直接子类还是间接子类),都应该在第一行代码写上Q_OBJECT...
Class `NullLineEdit` lacks Q_OBJECT macro C:\git_repos\sqlitebrowser\src\AddRecordDialog.cpp 39 Which looks like this line: sqlitebrowser/src/AddRecordDialog.cpp Line 39 in 37361d8 QAction* nullAction = new QAction(QIcon(":/icons/set_to_null"), tr("Set to NULL"), editContextMen...
Class Cerror1:public Qobject { Q_object Signals: void onbutclicked (); }; Class Cerror2:public Qobject { Q_object Signals: void onbutclicked (); }; Class Cerror2:public Qobject { Q_object Signals: void onbutclicked (); }; Error:class declarations lacks q_object macroThis...
Conversion between pointers of different object types should not be performed. V2546. MISRA. Expression resulting from the macro expansion should be surrounded by parentheses. V2547. MISRA. The return value of non-void function should be used. V2548. MISRA. The address of an object with ...