I am creating an application for the purpose of learning. I have a class for creating the window. I am creating a separate class that would help draw different shapes on the window. However, I am not able to draw on the window. It works fine when we keep all the code in the same class. But I want to keep the classes separate.I am creating an application for the purpose of
阅读背景：
MFC:在窗口中创建形状
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