本文介绍了无法连接基类的信号的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当我尝试连接一个BASE类信号时，Qt告诉我该信号不存在于DERIVED类。
When I try to connect a BASE class signal, Qt tells me the signal does not exists on the DERIVED class.
为什么？我如何告诉连接使用BASE类？
Why is that? How can I tell connect to use the BASE class?
namespace MyNamespace
{
void register(Derived* derived)
{
// ERROR MSG
// QObject::connect: No such signal MyNamespace::Derived::baseSignal()
QObject::connect( derived, SIGNAL(baseSignal()),
foo, SLOT(fooSlot()));
}
class Base : public QObject
{
Q_OBJECT
signals:
void baseSignal();
};
class Derived : public QObject,
public Base
{
Q_OBJECT
signals:
void derivedSignal();
};
} // namespace MyNamespace
推荐答案
在这种形式下会更好：
namespace MyNamespace
{
class Base : public QObject
{
Q_OBJECT
signals:
void baseSignal();
};
class Derived : public Base
{
Q_OBJECT
signals:
void derivedSignal();
};
void registerX( Derived* derived )
{
QObject::connect( derived, SIGNAL(baseSignal()), foo, SLOT(fooSlot()));
}
} // namespace MyNamespace
href =http://stackoverflow.com/questions/8578657/qobject-multiple-inheritance>此帖表示您不应继承QObject多次。
As this post says you shall not inherit QObject multiple times.
这篇关于无法连接基类的信号的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！