Re: errors pointing to the message map

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Sat, 17 May 2008 09:13:09 -0400
"Jack" <> wrote in message

1>c:\documents and settings\luckie.mechtrans\projects\sizecbar.cpp(55) :
error C2440: 'static_cast' : cannot convert from 'UINT (__thiscall
CSizingControlBar::* )(CPoint)' to 'LRESULT (__thiscall CWnd::* )(CPoint)'
1> Cast from base to derived requires dynamic_cast or static_cast

BEGIN_MESSAGE_MAP(CSizingControlBar, baseCSizingControlBar)
   ON_WM_NCHITTEST() <<<<<< C2440

how do I fix this? Thanks

Your message handler function has the wrong prototype. It should return
LRESULT instead of UINT. They used to be equivalent, but with 64-bit source
compatibility and improved compiler checking of the prototypes your old code
has a roadblock to progress. If you're not familiar with the message map
stuff you might want to just delete the function and message map line, then
add them again using the wizard.

Scott McPhillips [VC++ MVP]

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