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CFromview-disabling the close window

Posted on 1997-11-10
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Last Modified: 2013-11-20
hello,
   i have a CFormView that my application automatically draw on it's client screen at the start of the application, this is because i specified in appwizard that i want a database view w/file support, so a form is automatically created for me, i want to disable the close window of this form, i want to disable the 'X' box at the upper right hand of the form, so that it cannot be clicked by the user at run time, and also, i want the form to be maximized when that application draws it at the start of the application, how can i do these?  please help, thanks, mallow
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Question by:mallow
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Accepted Solution

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Chaya earned 10 total points
ID: 1309754
Since you write that the form window takes up only part of the total client area, I am going on the assumption that you are using an MDI based application.
Each AppWizard create MDI based application has a CMDIChildWnd derived class, usually called CChildFrame as one of its classes. This class forms the frame window for the MDI client, which in this case is a form/record view. All the changes to the window style of the form, have to be done within that class.

Now for the specific answers:
1. Disabling the "close window", and the 'X' box at the upper right hand of the form.
* In ClassWizard, make sure "CChildFrame" is in the class name box, and create a member function for the WM_CREATE message. This should create a CChildFrame::OnCreate message handler. Add the following two lines, as explained below:
 CMenu * sysMenu = GetSystemMenu( FALSE);
 sysMenu->EnableMenuItem(  SC_CLOSE,  MF_DISABLED | MF_BYCOMMAND | MF_GRAYED );
 These two lines get the window's system menu, and then disable the SC_CLOSE menu item, disabling the close and the 'X' in one shot.

2. Creating the form maximized
* In CChildFrame::PreCreateWindow add:
  cs.style = WS_CHILD | WS_VISIBLE | WS_OVERLAPPEDWINDOW | WS_MAXIMIZE;

before :      
return CMDIChildWnd::PreCreateWindow(cs); // Already in code - by AppWizard

this sets the window style to WS_CHILD | WS_VISIBLE | WS_OVERLAPPEDWINDOW - obligatory for MFC 2+ - otherwise you get an ASSERT (see TN019) and adds WS_MAXIMIZE - starting the window maximized.

Good Luck,
Chaya
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Author Comment

by:mallow
ID: 1309755
hello, i tried the code above, i was successful in maximizing the window and graying the 'X' of the window, but it did not disable the 'close window' the 'X' can still be clicked and the it closed the window, do you know what is wrong?  please help
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Expert Comment

by:Chaya
ID: 1309756
Wow! I checked it out and if the window is not maximixed, clicking the 'X' does nothing (as it should), but when maximized, it works as usual. By running Spy on the application, I discovered that when a child window is maximized the minimize, maximize and close buttons are considered bitmaps on the mainframe's window, and therefore not related to the child system menu. The roundabout that worked for me was to add a handler for OnSysCommand and having it ignore the SC_CLOSE command. The code is as follows:

void CChildFrame::OnSysCommand(UINT nID, LPARAM lParam)
{
// TODO: Add your message handler code here and/or call default
// THE FOLLOWING LINE IS WHAT I ADDED
      if (nID != SC_CLOSE )
//
            CMDIChildWnd::OnSysCommand(nID, lParam);
}

Adding this handler is a trifle tricky so I'll give you the full instructions.
* Open ClassWizard in the CChildFrame class.
* Pick the "Class Info" tab and in the "Message filter" drop-down list - choose "Window".
* Go back to the "Message maps" and in the "Messages" list box choose WM_SYSCOMMAND.

Good luck
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Author Comment

by:mallow
ID: 1309757
it worked already, thanks!
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