C++ Error: identifier "CWnd" is not defined

I'm very much a C++ newbie, so please bear with me.

This line of code which resides within a function:

开发者_StackOverflow社区CWnd* pWnd = CWnd::FindWindow("Shell_TrayWnd", "");

CWnd is coming up as "undefined". I know I need to define it in the global scope, but how? What header do I need to include to use this class? Project is MFC.

Using VS 2010.

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Here's how to solve this problem independently.

First, Google for "cwnd"

Second, click the first link.

Third, read the page

Requirements

Header: afxwin.h