void CCtrlMessageBarDblSubclassWnd::UnSubclassWindow(HWND hWnd)
{
if (hWnd == NULL)
return;
if (IsSubclassed(hWnd))
SetWindowLong(hWnd, GWL_WNDPROC, (LONG)AfxGetAfxWndProc());
}
BOOL CWnd::SubclassWindow(HWND hWnd)
{
if (!Attach(hWnd))
return FALSE;
// allow any other subclassing to occur
PreSubclassWindow();
// now hook into the AFX WndProc
WNDPROC* lplpfn = GetSuperWndProcAddr();
WNDPROC oldWndProc = (WNDPROC)::SetWindowLong(hWnd, GWL_WNDPROC,
(DWORD)AfxGetAfxWndProc());
ASSERT(oldWndProc != (WNDPROC)AfxGetAfxWndProc);
if (*lplpfn == NULL)
*lplpfn = oldWndProc; // the first control of that type created
#ifdef _DEBUG
else if (*lplpfn != oldWndProc)
{
TRACE0("Error: Trying to use SubclassWindow with incorrect CWnd\n");
TRACE0("\tderived class.\n");
TRACE3("\thWnd = $%04X (nIDC=$%04X) is not a %hs.\n", (UINT)hWnd,
_AfxGetDlgCtrlID(hWnd), GetRuntimeClass()->m_lpszClassName);
ASSERT(FALSE);
// undo the subclassing if continuing after assert
::SetWindowLong(hWnd, GWL_WNDPROC, (DWORD)oldWndProc);
}
#endif
return TRUE;
}
BOOL CCtrlMessageBarDblSubclassWnd::SubclassWindow(HWND hWnd, CCtrlMessageBar* pBar/*=NULL*/)
{
if (hWnd == NULL)
return FALSE;
CWnd* pWnd = CWnd::FromHandlePermanent(hWnd); // if not subclassed once, let us subclass.
if (pWnd == NULL)
{
_CTempWndSubclass *pNewWnd = new _CTempWndSubclass;
ASSERT(pNewWnd != NULL);
VERIFY(pNewWnd->SubclassWindow(hWnd));
ASSERT(CWnd::FromHandlePermanent(hWnd) != NULL);
}
if (IsSubclassed(hWnd)) // we've already subclassed it
return TRUE;
// attach the bar to the window, using properties
SetProp(hWnd, szInstancePropertyName, (HANDLE)pBar);
#ifdef _DEBUG
WNDPROC oldWndProc = (WNDPROC)
#endif // _DEBUG
::SetWindowLong(hWnd, GWL_WNDPROC, (DWORD)OurWndProc);
ASSERT(oldWndProc == AfxGetAfxWndProc());
ASSERT(oldWndProc != OurWndProc);
return TRUE;
}
