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add note regarding pch.h files #3963

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2 changes: 2 additions & 0 deletions docs/mfc/tn011-using-mfc-as-part-of-a-dll.md
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Expand Up @@ -51,6 +51,8 @@ You must add the AFX_MANAGE_STATE macro at the beginning of all the exported fun

`AFX_MANAGE_STATE(AfxGetStaticModuleState( ))`

Note: New generated MFC projects and DLLs with pch.h headers must explicitly include *afxmfc* header files which are used in your code. For example, using CString requires you to `include <atlstr.h>` in your pch.h.

## WinMain -> DllMain

The MFC library defines the standard Win32 `DllMain` entry point that initializes your [CWinApp](../mfc/reference/cwinapp-class.md) derived object as in a typical MFC application. Place all DLL-specific initialization in the [InitInstance](../mfc/reference/cwinapp-class.md#initinstance) method as in a typical MFC application.
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