Hi,

I have a class, see below, that needs to be subclassed in a dialog.
Inside the dialog (OnInitDialog), I need something like this.

m_MyControl.SubclassWindow(GetDlgItem(IDC_MyControl).m_hWnd);

m_MyControl.SetMouseHover(reinterpret_cast
<CMouseHover::ONMOUSEHOVER>(&mainWin::OnMouseHover)); //

Line above, will produce a casting error. I've seen some articles on this
theme http://www.progdoc.de/papers/chameleon/value/value.html but I simply
don't get it.

What can I do to fix this?

Thanks!

// for Subclassing controls so we have support for OnMouseHover and
OnMouseLeave
class CMouseHover: public CWindowImpl<CMouseHover>
{
public:
CMouseHover():  m_bIsMouseOver(false) , OnMouseHover(NULL),
OnMouseLeave(NULL)
{
}

//declare event signature
typedef void (CALLBACK* ONMOUSEHOVER)(int nFlags, int ID, POINT pt);
typedef void (CALLBACK* ONMOUSELEAVE)(int ID);
void SetMouseHover(ONMOUSEHOVER ptr) throw()
{
 OnMouseHover =  ptr;
}
ONMOUSEHOVER OnMouseHover;
ONMOUSELEAVE OnMouseLeave;
private:

bool m_bIsMouseOver;
BEGIN_MSG_MAP(CMouseHover)
 MESSAGE_HANDLER(WM_MOUSEHOVER, OnMouseHover_System)
 MESSAGE_HANDLER(WM_MOUSELEAVE, OnMouseLeave_System)
 MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove_System)
END_MSG_MAP()

LRESULT OnMouseHover_System(UINT, WPARAM wParam, LPARAM lParam, BOOL&)
throw()
{
 if (OnMouseHover != NULL)
 {
  POINT pt ={GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
  UINT nFlags = (UINT)wParam;
  OnMouseHover(nFlags, GetDlgCtrlID(), pt);
 }
 return FALSE;
}
LRESULT OnMouseLeave_System(UINT, WPARAM, LPARAM, BOOL&) throw()
{
 if (OnMouseLeave != NULL)
 {
  TRACKMOUSEEVENT evntTrack;
  evntTrack.cbSize = sizeof(TRACKMOUSEEVENT);
  evntTrack.hwndTrack = m_hWnd;
  evntTrack.dwHoverTime = HOVER_DEFAULT;
  evntTrack.dwFlags = TME_CANCEL | TME_LEAVE | TME_HOVER;
  TrackMouseEvent(&evntTrack);
  m_bIsMouseOver = false;
  OnMouseLeave(GetDlgCtrlID());
 }
 return 0;
}
LRESULT OnMouseMove_System(UINT, WPARAM, LPARAM, BOOL&) throw()
{
 ATLASSERT(::IsWindow(m_hWnd));
 if (!m_bIsMouseOver)
 {
  TRACKMOUSEEVENT evntTrack;
  evntTrack.cbSize = sizeof(TRACKMOUSEEVENT);
  evntTrack.hwndTrack = m_hWnd;
  evntTrack.dwHoverTime = HOVER_DEFAULT;
  evntTrack.dwFlags = TME_LEAVE | TME_HOVER;
  if (TrackMouseEvent(&evntTrack) == TRUE)
   m_bIsMouseOver = true;
 }
 //must return zero
 return FALSE;
}
};