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Using the mouse wheel

Posted on 1998-05-10
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Last Modified: 2013-11-20
I would like to use the mouse wheel in an Windows 95 application. I'm unable to intercept the WM_MOUSEWHEEL message (because it's unsupported under Windows 95). How can I do?
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Question by:bonduel
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Expert Comment

by:Blondie050798
ID: 1309277
You have to use OnRegisteredMouseWheel()
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Author Comment

by:bonduel
ID: 1309278
I know that, but what is the way to use OnRegisteredMouseWheel (there is no message WM_REGISTEREDMOUSEWHEEL).
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Accepted Solution

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Blondie050798 earned 200 total points
ID: 1309279
The document does explain (although not very well!)

The framework calls this member function as a user rotates the mouse wheel and encounters the wheel's next notch. Unless overridden, OnRegisteredMouseWheel registers the Windows message, routes the message to the appropriate window, and calls the WM_MOUSEWHEEL handler for that window.

It is far easier to understand what is going on by looking at the source used by mfc, and simply 'do your own thing' as required!

So looking at the mfc source:

// register for Windows 95 or Windows NT 3.51
static UINT nMsgMouseWheel =
   (((::GetVersion() & 0x80000000) && LOBYTE(LOWORD(::GetVersion()) == 4)) ||
       (!(::GetVersion() & 0x80000000) && LOBYTE(LOWORD(::GetVersion()) == 3)))
       ? ::RegisterWindowMessage(MSH_MOUSEWHEEL) : 0;

and then in the message map:
ON_REGISTERED_MESSAGE(nMsgMouseWheel, OnRegisteredMouseWheel)

and then the actual source:
LRESULT CFrameWnd::OnRegisteredMouseWheel(WPARAM wParam, LPARAM lParam)
{
      // convert from MSH_MOUSEWHEEL to WM_MOUSEWHEEL

      WORD keyState = 0;
      keyState |= (::GetKeyState(VK_CONTROL) < 0) ? MK_CONTROL : 0;
      keyState |= (::GetKeyState(VK_SHIFT) < 0) ? MK_SHIFT : 0;

      LRESULT lResult;
      HWND hwFocus = ::GetFocus();
      const HWND hwDesktop = ::GetDesktopWindow();

      if (hwFocus == NULL)
            lResult = SendMessage(WM_MOUSEWHEEL, (wParam << 16) | keyState, lParam);
      else
      {
            do {
                  lParam = ::SendMessage(hwFocus, WM_MOUSEWHEEL,
                        (wParam << 16) | keyState, lParam);
                  hwFocus = ::GetParent(hwFocus);
            }
            while (lParam == 0 && hwFocus != NULL && hwFocus != hwDesktop);
      }
      return lResult;
}
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Author Comment

by:bonduel
ID: 1309280
Thank U
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