Wincore Debug assertion failed

  • Thread starter Thread starter Mullai
  • Start date Start date
M

Mullai

Hi ,
My program gives an error message like this

Debug Assertion Failed!
program:................
File: wincore.cpp
Line: 958

Please can anyone help me out in this issue. I have to solve this bug
immediately in my project.
The line 958 is as follows in wincore.cpp

When I am trying to close my window created CFrameWnd class by calling
DestroyWindow() this assertion has been asserted.

BOOL CWnd::DestroyWindow()
{
if (m_hWnd == NULL)
return FALSE;

CHandleMap* pMap = afxMapHWND(); ///// line 958/////
ASSERT(pMap != NULL);
CWnd* pWnd = (CWnd*)pMap->LookupPermanent(m_hWnd);

Thanks
Mullai
 
Hi,

You wouldn't normally call DestroyWindow for a CFrameWnd. Could you explain
why you are trying to do this and show us some of your code.

Cheers
Doug Forster
 
first of all Thanku Mr.Doug Forster for ur response.

My scenario is:

In CMainframe class , I add my own class called CChildWindow
which is derived from CScrollview. In CChildWindow I added my own class
called CPagewindow which is been derived from CFrameWnd.The place where
I get error is , While I am trying to close my main application,
CMainframe's OnClose() is called which in turn calls CChildWindow's
OnClose() where the Pagewindow->DestroyWindow() is called. Here only
the assertion occurs.

CMainframe -> CChildWindow -> CPageWindow -> DestroyWindow()

The Code follows as:

void CMainFrame::OnClose()
{

GlobalMembers::m_PageWindowHandle=m_ChildWnd->m_structPgDetails.PageHandle;
m_ChildWnd->OnClose();
CFrameWnd::OnClose();

}

void CChildWindow::OnClose()
{
pagewindow->DestroyWindow();
}

///// Asserts here in destroy window
Debug Assertion Failed!/////
 
Hi,

Well I don't fully understand your window structure, but usually if they are
all parented correctly you shouldn't need to do anything special to close
child windows - the MFC infrastructure will handle it. So the first thing to
try is simply commenting out much of your closing code - the assertion is
just telling you that the window is already gone. If for some reason you DO
need to explicitly close a window then the usual way is to simply Post a
WM_CLOSE and let the infrastructure handle the rest. Usually the only
situation you need to explicitly call DestroyWindow in MFC is during the
shutdown handling of a modeless dialog.

Cheers
Doug Forster

Mullai said:
first of all Thanku Mr.Doug Forster for ur response.

My scenario is:

In CMainframe class , I add my own class called CChildWindow
which is derived from CScrollview. In CChildWindow I added my own class
called CPagewindow which is been derived from CFrameWnd.The place where
I get error is , While I am trying to close my main application,
CMainframe's OnClose() is called which in turn calls CChildWindow's
OnClose() where the Pagewindow->DestroyWindow() is called. Here only
the assertion occurs.

CMainframe -> CChildWindow -> CPageWindow -> DestroyWindow()

The Code follows as:

void CMainFrame::OnClose()
{

GlobalMembers::m_PageWindowHandle=m_ChildWnd->m_structPgDetails.PageHandle;
m_ChildWnd->OnClose();
CFrameWnd::OnClose();

}

void CChildWindow::OnClose()
{
pagewindow->DestroyWindow();
}

///// Asserts here in destroy window
Debug Assertion Failed!/////
Doug said:
Hi,

You wouldn't normally call DestroyWindow for a CFrameWnd. Could you
explain
why you are trying to do this and show us some of your code.

Cheers
Doug Forster
Click to expand...
Click to expand...
 
Hi,

I tried by sending a window Message (WM_CLOSE) . Even then the
problem occurred. I then found out this error is because of the current
thread state. SO I added AFX_MANAGE_STATE(Afxgetappmodulestate())
before the window message. The problem is solved.

THANK U FOR YOUR KIND HELP.

REGARDS,
Mullai.P


Doug said:
Hi,

Well I don't fully understand your window structure, but usually if they are
all parented correctly you shouldn't need to do anything special to close
child windows - the MFC infrastructure will handle it. So the first thing to
try is simply commenting out much of your closing code - the assertion is
just telling you that the window is already gone. If for some reason you DO
need to explicitly close a window then the usual way is to simply Post a
WM_CLOSE and let the infrastructure handle the rest. Usually the only
situation you need to explicitly call DestroyWindow in MFC is during the
shutdown handling of a modeless dialog.

Cheers
Doug Forster

Mullai said:
first of all Thanku Mr.Doug Forster for ur response.

My scenario is:

In CMainframe class , I add my own class called CChildWindow
which is derived from CScrollview. In CChildWindow I added my own class
called CPagewindow which is been derived from CFrameWnd.The place where
I get error is , While I am trying to close my main application,
CMainframe's OnClose() is called which in turn calls CChildWindow's
OnClose() where the Pagewindow->DestroyWindow() is called. Here only
the assertion occurs.

CMainframe -> CChildWindow -> CPageWindow -> DestroyWindow()

The Code follows as:

void CMainFrame::OnClose()
{

GlobalMembers::m_PageWindowHandle=m_ChildWnd->m_structPgDetails.PageHandle;
m_ChildWnd->OnClose();
CFrameWnd::OnClose();

}

void CChildWindow::OnClose()
{
pagewindow->DestroyWindow();
}

///// Asserts here in destroy window
Debug Assertion Failed!
program:................
File: wincore.cpp
Line: 958
Click to expand...
/////
Doug said:
Hi,

You wouldn't normally call DestroyWindow for a CFrameWnd. Could you
explain
why you are trying to do this and show us some of your code.

Cheers
Doug Forster

Hi ,
My program gives an error message like this

Debug Assertion Failed!
program:................
File: wincore.cpp
Line: 958

Please can anyone help me out in this issue. I have to solve this bug
immediately in my project.
The line 958 is as follows in wincore.cpp

When I am trying to close my window created CFrameWnd class by calling
DestroyWindow() this assertion has been asserted.

BOOL CWnd::DestroyWindow()
{
if (m_hWnd == NULL)
return FALSE;

CHandleMap* pMap = afxMapHWND(); ///// line 958/////
ASSERT(pMap != NULL);
CWnd* pWnd = (CWnd*)pMap->LookupPermanent(m_hWnd);

Thanks
Mullai
Click to expand...
Click to expand...
Click to expand...
 
Assertion Error in Wincore.cpp

Hi

How did you fix this problem ? I have this problem my self, when i try to close my mainframe window, i get this error and the .exe still running, the main window is closed but i get this assertion in wincore.cpp and the .exe fil still running, i had to open task manager and close the .exe fil from there.

Where did you post the WM_CLOSE messages, can you please show me all the codes you used ? It will be very useful for me to solve my problem.

Thank you very much in advance

Best regards

Luc
 
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