MFC OnTimer function does not compile when porting legacy code from 32-bit to 64-bit

by APIJunkie 12/22/2009 7:17:00 AM

I was recently porting an MFC C++ application that compiled on Visual studio 2005 32-bit to VS 2008 64-bit.

It turns out there is a bug in the code generated by older versions of MFC that makes it not compile on 64 bit.

The problem is with the OnTimer function signature:

afx_msg void OnTimer(UINT nIDEvent);

It should be changed to ->

afx_msg void OnTimer(UINT_PTR nIDEvent);

You can find Microsoft’s reaction to a similar connect bug report for VS 2005 at:

http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=101372

Hope this helps!

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MFC | C++ | Win64

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My name is Bacon…James Bacon.

I am an API wars veteran I was wounded by x86 assembly, recovered and moved on to C. Following a long addiction to C++ and a short stint at rehab I decided to switch to a healthier addiction so I am now happily sniffing .NET and getting hooked on Silverlight.

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