You open the file by calling the in function of the DL_Dxf object and passing a pointer to a class that inherits from the DL_CreationAdapter abstract class.
通过调用 DL_Dxf 对象的 in 函数并将指针传递给一个继承 DL_CreationAdapter 抽象类来打开此文件。
In a base class, abstract class is defined by declaring pure virtual function, a derived class must define all inherited pure virtual functions of its base classes to be concrete.
在基类中可以通过将虚函数声明为纯虚函数的手段来定义抽象类，强制派生类在自己的类定义中实现虚函数的具体功能。
How do I call a function in an abstract class?
我怎么把一个抽象类的函数？
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