Get the CChildFrame from CDocument or CView

For example my classes are CDifarDocument/CDifarView subclass of CDocument/CView . How to get the CChildFrame from CDifarDocument or CDifarView ?

My purpose is to get the system menu of the child window to enable/disable buttons, I can get the system menu from CChildFrame, but cannot get from other objects.

From CDifarDocument I get the CDifarView, and from CDifarView get the system menu:

CMenu *pSysMenu = pView->GetSystemMenu(FALSE);
ASSERT(pSysMenu != NULL);

but it fail at the ASSERT
ahTriAsked:
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manojbkumarConnect With a Mentor Commented:
>>what function to get the main window ?

pView->GetTopLevelFrame();
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manojbkumarCommented:
ahTri
Call the GetParent() function of the view and cast it to CCHildFrame.For your purpose replace the line
CMenu *pSysMenu = pView->GetSystemMenu(FALSE);
with
CMenu *pSysMenu = GetParent()->GetSystemMenu(FALSE);

GoodLuck
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ahTriAuthor Commented:
Cool it's work, how about the main window ? what function to get the main window ?
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Roshan DavisCommented:
For getting main window

CMainFrame *pFrame = (CMainFrame *)AfxGetMainWnd();

GOOD LUCK

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ahTriAuthor Commented:
I already try this before it bring up the exception in afxwin2.inl line 62

_AFXWIN_INLINE CMenu* CWnd::GetSystemMenu(BOOL bRevert) const
{
  ASSERT(::IsWindow(m_hWnd)); return
  CMenu::FromHandle(::GetSystemMenu(m_hWnd, bRevert));
}
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ahTriAuthor Commented:
I know this is strange, I had another MDI window which work happily with this command
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ahTriAuthor Commented:
Geeze actually I have this in my code
     CFrameWnd *pFrame = pView->GetTopLevelFrame();
     MainSysMenu = pFrame->GetSystemMenu(FALSE);

and it ok the first run to disable the menu, after done and ready to enable menu it bring up the assert error again:

_AFXWIN_INLINE CMenu* CWnd::GetSystemMenu(BOOL bRevert) const
     { ASSERT(::IsWindow(m_hWnd)); return CMenu::FromHandle(::GetSystemMenu(m_hWnd, bRevert)); }

still line 62 of afxwin2.inl
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