FIX: C2664 Error w/Property Sheet Component Added to CDocument

• Microsoft Visual C++, 32-bit Edition, versions 4.0, 4.1, 4.2

SYMPTOMS

When you insert a modeless property sheet from the Property Sheet component in the Component Gallery into a CDocument-derived class or other non-CWnd derived class, the compiler generates this error:

   C2664:'Create' : cannot convert parameter 5 from 'class CDocDerivedClass
        *const' to 'class CWnd *' (new behavior; please see help).

CAUSE

The modeless property sheet component placed in an application includes a CMiniFrameWnd-derived class that actually contains the modeless property sheet. When using the component, the application calls Create() on the CMiniFrameWnd-derived class. This Create() requires a CWnd* to its parent window as its fifth argument. The code generated for your application passes 'this' to the Create() call. CDocument is not derived from CWnd; therefore, passing the 'this' pointer from the CDocument into the CMiniFrame::Create() function causes the compiler error.

RESOLUTION

Place the property sheet component into a class that is derived from CWnd.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. The problem was corrected in Visual C++ version 5.0.

Keywords          : MfcUI vcbuglist400 vcfixlist500 kbprg kbbuglist kbfixlist
Technology        : kbMfc
Version           : 4.0 4.1 4.2
Platform          : NT WINDOWS
Issue type        : kbbug
Solution Type     : kbfix