如何从类名称中找到Qt元对象实例? [英] How can I find a Qt metaobject instance from a class name?

问题描述

在给定类名的情况下，是否可以找到类的QMetaObject实例?我想做的是从磁盘加载对象，但是要实现这一点，我需要一种使用类名检索QMetaObject实例的方法，以便使用QMetaObject创建实例.

Is there a way to find the QMetaObject instance of a class, given the class name? what I like to do is to load objects from disk, but for this to happen, I need a way to retrieve a QMetaObject instance using the name of a class, in order to use the QMetaObject to create an instance.

推荐答案

您应该可以使用 QMetaType .您可能需要Q_DECLARE_META_TYPE()和/或qRegisterMetaType()才能知道您的类型.然后，它应该大致类似于本示例中的链接:

You should be able to do this with QMetaType. You might need Q_DECLARE_META_TYPE() and/or qRegisterMetaType() to make your types known. Then it should work roughly like in this example from the link:

 int id = QMetaType::type("MyClass");
 if (id == 0) {
     void *myClassPtr = QMetaType::construct(id);
     ...
     QMetaType::destroy(id, myClassPtr);
     myClassPtr = 0;
 }

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