Re: ToolTip problem in a child dialog box

From:

Phil <pbruyant@yahoo.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 11 Apr 2008 02:42:24 -0700 (PDT)

Message-ID:

<76f4e236-3bcf-4373-81d5-217a0109e748@p25g2000hsf.googlegroups.com>

On 11 avr, 09:54, Phil <pbruy...@yahoo.com> wrote:

On 10 avr, 19:00, Dan Bloomquist <publi...@lakeweb.com> wrote:

Phil wrote:

Hi
I am using MS VC 6.0 and Vista.
I have a dialog box containing a CTabCtrl control.
I put a child dialog box for each tab.
In each child dialog box, I put a number of controls (CEdit...).
For each control, I specify a tooltip.
So far, so good.
Here is my problem:
In Debug mode (not in Release mode), after the tooltip appears, if I
move the mouse so that the cursor enters the tooltip area (before the
tooltip disappears), I get
           ASSERT(::IsWindow(m_hWnd));
in wincore.cpp.
It is my understanding that the program is looking for a tooltip for
the tooltip, and that the tooltip is not recognized has a valid
window !
Can someone tell me what I did wrong and how to solve this problem?
Thanks!
Phil
////////////////////////////////////
BOOL CTab::OnToolTipNotify(UINT id, NMHDR *pNMHDR, LRESULT *pResult)
{
  TOOLTIPTEXT *pTTT = (TOOLTIPTEXT *)pNMHDR;
  UINT nID =pNMHDR->idFrom;

  if (pTTT->uFlags & TTF_IDISHWND)
    {
    // idFrom is actually the HWND of the tool
    nID = ::GetDlgCtrlID((HWND)nID);

//Here, make sure you have a tip window
     // pNMHDR->idFrom is actually the HWND of the control
     nID= ::GetDlgCtrlID( reinterpret_cast<HWND>( (DWORD_PTR)nID ) );
     CToolTipCtrl* pToolTip= AfxGetModuleThreadState( )->m_pToolTip;
     if( nID && pToolTip && pToolTip->GetSafeHwnd( ) )

      {
      pTTT->lpszText = MAKEINTRESOURCE(nID);
      pTTT->hinst = AfxGetInstanceHandle();
      return(TRUE);
      }
    }

  return(FALSE);
}
///////////////////////////////////////////////////////

Best, Dan.

Thank you for your reply, but I have two problems:
In my program, the AfxGetModuleThreadState( ) does not have a
variable named m_pToolTip.
Second, I would like to know why I get this ASSERT() message, so that
I can eliminate the problem instead of finding a patch to it.
TXS
Phil

OK, here is what I've done:

BOOL CTab1::OnToolTipNotify(UINT id, NMHDR *pNMHDR, LRESULT *pResult)
{
  TOOLTIPTEXT *pTTT = (TOOLTIPTEXT *)pNMHDR;
  UINT nID =pNMHDR->idFrom;

  CToolTipCtrl* pToolTip = AfxGetThreadState()->m_pToolTip;

  if (pTTT->uFlags & TTF_IDISHWND)
    {
    // idFrom is actually the HWND of the tool
    nID = ::GetDlgCtrlID((HWND)nID);
    if(nID && pToolTip && pToolTip->GetSafeHwnd())
      {
      pTTT->lpszText = MAKEINTRESOURCE(nID);
      pTTT->hinst = AfxGetInstanceHandle();
      return(TRUE);
      }
    }
  return(FALSE);
}

Unfortunately, it doesn't help; I still get
ASSERT(::IsWindow(m_hWnd));
Actually, I think nothing is wrong with displaying the tooltip. The
problem arises when the cursor leaves the control and enters the
tooltip message area.
Anyone can help ?
-P