PRB: ActiveDesktop Compilation Errors Under Visual C++ 6.0 MFC

CAUSE

When an MFC application includes the Stdafx.h header file, the file *\Vc98\Mfc\Include\Afxdisp.h is included by default. Within Afxdisp.h the file Shlobj.h (required for ActiveDesktop) is included. But at this point, Wininet.h has not been included, so certain portions of Shlobj.h are not correctly initialized for ActiveDesktop support.

The inclusion of Shlobj.h by Afxdisp.h also sets a variable preventing Shlobj.h from being included twice. Later, when an MFC application explicitly and correctly includes Wininet.h followed by Shlobj.h, the previously set variable prevents the second Shlobj.h inclusion and also prevents critical ActiveDesktop definitions, such as for LPACTIVEDESKTOP, from being made.

// stdafx.h : include file for standard system include files,

...

#include <wininet.h>
#include <afxdisp.h>        // MFC Automation classes

...

#endif //!defined(AFX_STDAFX_H__D5E466A9...