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Posted on 2003-10-23
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Last Modified: 2013-11-20
I'm trying to write a dll, but I didn't get far until I ran into an annyoing problem.
I want to use the CCriticalSection class, and according to the msdn I have to include
afxmt.h. However, that gives me the following error:

fatal error C1189: #error :  WINDOWS.H already included.  MFC apps must not #include <windows.h>

I tried to place afxmt.h over stdafx.h, and that gave another error (or errors):

error C2065: 'CCriticalSection' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'ccs'
error C2065: 'ccs' : undeclared identifier

What is going on?? I've pasted the code below.


#include "stdafx.h"
#include "afxmt.h"


BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                               )
{
    CCriticalSection ccs;
      
    return TRUE;
}

Thanks in advance.

/Nick
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Question by:Nick_72
2 Comments
 
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Accepted Solution

by:
eelko earned 400 total points
ID: 9610720
I think the problem is that you should add MFC support when you create your project.
So choose MFC Appwizard (dll) project instead of a Win32 Dynamic-Link Library
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Author Comment

by:Nick_72
ID: 9610855
Ok, that worked better, thanks :)

I used the third option: MFC extension DLL (Using Shared MFC DLL), not knowing really why.  What is the main difference between the three of them?  

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