MFC派生我自己的班级 [英] MFC Deriving my own class

问题描述

我在MFC中创建自己的UI组件。我从 CWnd 类派生它，我将覆盖 OnPaint（）方法。我的问题涉及方法 Create（），它继承自 CWnd 。我想知道从构造函数调用它是否合适（也许不是，因为创建时不会调用虚方法）或者我将让类的客户端调用 Create（）他自己的方法（我不喜欢）...



感谢您的意见。



祝你好运，

JK

Hi,

I am creating my own UI component in MFC. I derived it from CWnd class and I am going to override OnPaint() method. My question concerns the method Create(), that is inherited from CWnd . I would like to know if it is good to call that from the constructor (perhaps not, because virtual methods shall not be called while creation) or I shall let the client of the class to call the Create() method on his own (which I dont like)...

Thanks for your opinions.

Best regards,
J.K.

推荐答案

我担心你应该使用Create方法：一般窗口创建序列 [ ^ ]



最好的问候

Espen Harlinn

I''m afraid you should use the Create approach: General Window Creation Sequence[^]

Best regards
Espen Harlinn

MFC的理念是一个两步创建过程，所以分离构造函数和创建调用。为了向其他MFC类提供一致的行为，我会坚持使用它。



调用者调用Create的第二个好理由是来自构造函数的你报告任何错误的手段有限。您可以抛出异常，而在单独的Create函数中，您可以返回一个值。

MFC''s philosophy is a 2-step creation process, so a separation of constructor and create call. I would just stick with that for reasons of presenting a consistent behavior to other MFC classes.

A second good reason for having the caller call Create is that from a constructor you have limited means of reporting any errors. You can just throw an exception, whereas in a separate Create function you can return a value.

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