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 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();        

 };