C / C++ / MFC

class  AFX_EXT_CLASS sample : public CObject
{
}

#include "stdio.h"
#include "conio.h"
#include "windows.h"
#include "Wininet.h"
#include "Ras.h"
#include "raserror.h"
#pragma comment(lib, "rasapi32.lib")

int main()
{
	LPRASCONN lpRasConn;
	DWORD dwCb=0;
	DWORD dwRet;
	DWORD dwConnections = 0;
	HRASCONN hRasConn;
	
	lpRasConn = (LPRASCONN) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwCb);

	lpRasConn[0].dwSize=sizeof(RASCONN) ;

    dwRet = RasEnumConnections(lpRasConn, &dwCb, &dwConnections);

	if(dwRet==ERROR_SUCCESS)
		for(int i=0 ; i < dwConnections ; i++)
		{
			hRasConn= lpRasConn[i].hrasconn;
			BOOL b=RasHangUp(hRasConn);
		}
//	HeapFree(GetProcessHeap(), 0, lpRasConn);
	_getch();
	
}

ICommDlgBrowser2: base class undefined

EXTERN_C const IID IID_ICommDlgBrowser3;

#if defined(__cplusplus) && !defined(CINTERFACE)
    
    MIDL_INTERFACE("c8ad25a1-3294-41ee-8165-71174bd01c57")
    ICommDlgBrowser3 : public ICommDlgBrowser2
    {
    public:
        virtual HRESULT STDMETHODCALLTYPE OnColumnClicked( 
            /* [in] */ __RPC__in_opt IShellView *ppshv,
            /* [in] */ int iColumn) = 0;
        
        virtual HRESULT STDMETHODCALLTYPE GetCurrentFilter( 
            /* [size_is][string][out] */ __RPC__out_ecount_full_string(cchFileSpec) LPWSTR pszFileSpec,
            /* [in] */ int cchFileSpec) = 0;
        
        virtual HRESULT STDMETHODCALLTYPE OnPreViewCreated( 
            /* [in] */ __RPC__in_opt IShellView *ppshv) = 0;
        
    };
    
#else 	/* C style interface */
//......................................
//again some code
//......................................

Compiling...
snaplogger_main.cpp
 WINVER not defined. Defaulting to 0x0501 (Windows XP and Windows .NET Server)
CSnapLogger.cpp
 WINVER not defined. Defaulting to 0x0501 (Windows XP and Windows .NET Server)
CDeviceFileParser.cpp
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\afxv_w32.h(18) : fatal error C1189: #error :  WINDOWS.H already included.  MFC apps must not #include <windows.h>
CCommsManager.cpp
 WINVER not defined. Defaulting to 0x0501 (Windows XP and Windows .NET Server)