MFC Deriving my own class

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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.

Posted 1-Jun-13 6:47am

Kucera Jan

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nv3 · Accepted Answer · 2013-06-01T07:40:00

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.

Espen Harlinn · Accepted Answer · 2013-06-01T07:36:00

Solution 1

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

Best regards
Espen Harlinn

Posted 1-Jun-13 7:36am

Espen Harlinn

Comments

Sergey Alexandrovich Kryukov 11-Jun-13 19:42pm

Good link, a 5.
—SA

Espen Harlinn 12-Jun-13 15:43pm

Thank you, Sergey :-D