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Disable "close" menu items

I have a MDI window applications. Each child window have it's own set of thread and if these thread are running and user close window (by click on the cross button of system menu, or  on menu File_Exit) it may lead to an error cos some my threads are not completly stopped.

How to disable the system menu buttons and File_Exit, I want to avoid user close program until they stop the processing threads ?
0
ahTri
Asked:
ahTri
  • 3
1 Solution
 
manojbkumarCommented:
Write the WM_SYSCOMMAND handler in your CChildFrame class and check for SC_CLOSE

In ChildFrm.h add
///////////////////////////////////////////////////
protected:
     //{{AFX_MSG(CChildFrame)
          // NOTE - the ClassWizard will add and remove member functions here.
          //    DO NOT EDIT what you see in these blocks of generated code!
     //}}AFX_MSG
     DECLARE_MESSAGE_MAP()
     afx_msg void OnSysCommand( UINT nID, LPARAM lParam );
/////////////////////////////////////

In ChildFrm.cpp
//////////////////////////////////////////////////
BEGIN_MESSAGE_MAP(CChildFrame, CMDIChildWnd)
     //{{AFX_MSG_MAP(CChildFrame)
          // NOTE - the ClassWizard will add and remove mapping macros here.
          //    DO NOT EDIT what you see in these blocks of generated code !
     //}}AFX_MSG_MAP
     ON_WM_SYSCOMMAND()
END_MESSAGE_MAP()
/////////////////////////////////////////////

//////////////////////////////////
void CChildFrame::OnSysCommand( UINT nID, LPARAM lParam )
{
     if(nID == SC_CLOSE )
     {
          //Close button pressed
                //Close your threads or
          return;
     }
     CMDIChildWnd::OnSysCommand( nID,lParam );
}
///////////////////////////////////////
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DanRollinsCommented:
Alternative: disable the button and the menu command:

CMenu *pSysMenu = GetSystemMenu(FALSE);
ASSERT(pSysMenu != NULL);
pSysMenu->EnableMenuItem( SC_CLOSE, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED  );


-- Dan
0
 
ahTriAuthor Commented:
Although manojbkumar's comment gave me a fair bit of useful information , DanRollins' comment is more directly answer my question.

Thanks
0
 
ahTriAuthor Commented:
Hi DanRollins,

I can get the system menu from CChildFrame, but how to get the system menu from a sub class of CDocument or CView ? Say my classes are CDifarDocument and CDifarView

From CDifarDocument I get the CDifarView, and from CDifarView get the system menu but fail the ASSERT(pSysMenu != NULL);

0
 
ahTriAuthor Commented:
Or how to get the CChildFrame from CDifarDocument or CDifarView ?
0

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