stdafx.h

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#define VC_EXTRALEAN		// Exclude rarely-used stuff from Windows headers

#include <afxwin.h>         // MFC core and standard components
#include <afxext.h>         // MFC extensions
#include <afxsock.h>        // Sockets support
#include <afxpriv.h>        // T2A macros
#include <math.h>


#define SOCKMFC_EXT_CLASS   //define which the CWSocket class requires