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CFrameWnd::OnCreate<br />
^^ Class &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ^^ Member of class
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CFrameWnd::OnCreate
^^ Class           ^^ Member of class

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It's not about MFC. In C++ program any variable is visiable in a certain part of the application. In your case, you say to call method OnCreate from CFrameWnd class. CFrameWnd is a base class in this case.<br />
&nbsp;<br />

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It's not about MFC. In C++ program any variable is visiable in a certain part of the application. In your case, you say to call method OnCreate from CFrameWnd class. CFrameWnd is a base class in this case.
 


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BTW, the name is &quot;scope resolution operator&quot;.
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BTW, the name is "scope resolution operator".

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for example<br />
if ( CFrameWnd::OnCreate(lpCRea<wbr />teStruct) == 1 )<br />
<br />
what is the meaning of :: &nbsp; <br />
I just thought it is a inheritance
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for example
if ( CFrameWnd::OnCreate(lpCReateStruct) == 1 )

what is the meaning of ::   
I just thought it is a inheritance

what is   ::  in MFC

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.