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。

youdao

If I have a pointer to an object cast to one of its base classes, I can call the correct member functions through the abstract base class.

如果我有一个对象的指针，转换到它的基类指针对象上，我能通过基类指针调用合适的成员函数。

youdao

If I have a pointer to an object cast to one of its base classes, I can call the correct member functions through the abstract base class.

如果我有一个对象的指针，转换到它的基类指针对象上，我能通过基类指针调用合适的成员函数。

youdao