Re: CWindow::Create Failure

Hi there,

   I have a class derived from CWindowImpl and I am handling the WM_CREATE
message via a message handler and map.

   -----------

   BEGIN_MSG_MAP(CMyWindow)
       MESSAGE_HANDLER(WM_CREATE, OnCreate)
   END_MSG_MAP()

   LRESULT OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/,
BOOL& /*bHandled*/);

   LRESULT CFlashView::OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM
lParam, BOOL& /*bHandled*/)
   {
       #if FLASH
           cWndChildWindow = CWindow::Create(WC_MYWINDOWCLASS, m_hWnd,
NULL, NULL, WS_CHILD);
           cWndChildWindow.ShowWindow(SW_SHOW);
       #endif
       return(0);
   }

   -----------

   In the OnCreate method I would like to create an instance of a child
window that needs to be displayed in this window. But for some reason I
am greeted with an Assertion Failure with the expression

   m_hWnd == 0
   ...
   ATLASSUME(m_hWnd == NULL)

   Now is this telling me that m_hWnd needs to be 0? or can't be 0?

   m_hWnd is the handle to CMyWindow and at this point it should have been
created right? This is really confusing me, if I pass 0 to the method it
continues but then fails on the next line as CWndChildWindow was never
created. cWndChildWindow is a CWindow object.

   Any help would be greatly appreciated! Thanks for your time in
advance.

Nick.