Wincore Debug assertion failed

[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

[Doug Forster]

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

"Mullai" <mu*******@gmail.comwrote in message
news:11**********************@m79g2000cwm.googlegr oups.com...

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

[Mullai]

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[i].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

/////
Doug Forster wrote:

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

"Mullai" <mu*******@gmail.comwrote in message
news:11**********************@m79g2000cwm.googlegr oups.com...

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

[Doug Forster]

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" <mu*******@gmail.comwrote in message
news:11*********************@b28g2000cwb.googlegro ups.com...

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[i].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

/////
Doug Forster wrote:

>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

"Mullai" <mu*******@gmail.comwrote in message
news:11**********************@m79g2000cwm.googleg roups.com...

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

[Mullai]

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 Forster wrote:

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" <mu*******@gmail.comwrote in message
news:11*********************@b28g2000cwb.googlegro ups.com...

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[i].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

/////
Doug Forster wrote:

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

"Mullai" <mu*******@gmail.comwrote in message
news:11**********************@m79g2000cwm.googlegr oups.com...
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