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WM_MOUSEWHEEL

Started by docyoung83 4 replies 4.6k views
Original Post
docyoung83
docyoung83
I am having trouble getting the WM_MOUSEWHEEL event handler written so that my program will compile. Apparently WM_MOUSEWHEEL is not a constant that's been defined in any of my header files, which I find odd. The errors I'm getting are: (119): error C2065: 'WM_MOUSEWHEEL' : undeclared identifier (119): error C2051: case expression not constant I am using Microsoft Visual C++ .NET 2003. I thought that maybe I would have to update the Platform SDK, which I thought I did, but it didn't help. What I did to update the Platform SDK was the following: 1) Download the latest Platform SDK (MS Platform SDK for Windows Server 2003 SP1) from microsoft.com. 2) Install the SDK to C:\Program Files\Platform SDK 3) Overwrite the folder "C:\Programs Files\MSVS .NET 2003\VC7\PlatformSDK with the folder "C:\Program Files\Platform SDK" and rename it accordingly. It's sort of a "hack" way to do it, and might have not worked.
Sam Gamgee
Sam Gamgee
This has been asked several times recently actually and there is a pretty nice fix to the problem which of course I can't remember (do a search). However all I do is replace WM_MOUSEWHEEL with 0x20a in my switch statement and that solves the problem. Again do a search for the nicer solution...
docyoung83
docyoung83
Thanks, I'll do a search on it. I actually tried Google several times, and the MSDN, but apparently I wasn't thorough enough or didn't quite know what I was looking for. In the meantime, I'll use your hack until I find the proper solution. Works well enough for test runs!
docyoung83
docyoung83
Ah, searching finally pays off. I present the following, for interested parties:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwui/html/BestPracticesforSupportingMicrosoftMouseandKeyboardDevices.asp
// These values must be defined to handle the WM_MOUSEHWHEEL on // Windows 2000 and Windows XP, the first two values will be defined // in the Longhorn SDK and the last value is a default value // that will not be defined in the Longhorn SDK but will be needed for // handling WM_MOUSEHWHEEL messages emulated by IntelliType Pro// or IntelliPoint (if implemented in future versions).#define WM_MOUSEWHEEL                            0x020E
Source
Source
WM_MOUSEWHEEL is only defined in later versions of windows. To have the identifier defined you'll need to put the line 

#define _WIN32_WINDOWS 0x501


before you include windows.h (or something like objbase.h etc) then the mouse wheel macros are defined properly and your code will compile.
docyoung83
docyoung83
Source wins. Thanks. It turns out that my solution defining WM_MOUSEWHEEL as 0x020e didn't work anyway.

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