WS_CHILD and CWnd

Ray Marshall -- ray@newton.apple.com
Saturday, January 20, 1996

Hello,

I am trying to create a CWnd object with the WS_CHILD style. For some reason
when I do this, the Window doesn't show. It's invisible. If I use the
WS_POPUP style, then everything works (except I don't have the desired child
behaivor). This is what I am doing:

// create the CWnd object
pWnd = new CMyCwnd;
pWnd->Create( ownerWnd );
pWnd->ShowWindow( SW_SHOW );
pWnd->UpdateWindow();


// my derived Create method
BOOL CMyCwnd::Create( CWnd *pParent )
{
  CString classname;
  classname = AfxRegisterWndClass( CS_DBLCLKS );

  if ( !CWnd::CreateEx( WS_EX_TOPMOST | WS_EX_TOOLWINDOW, classname, "MyWnd", 
    WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | 
    WS_BORDER | WS_DLGFRAME | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME,
    10, 10, 300, 400, pParent->GetSafeHwnd(), NULL ))
  {
    TRACE0("Warning: creation of CMyWnd failed\n");
    return FALSE;
  }
  return TRUE;
}

I have tried every thing I can think of to get this too work but figure I am
missing the obvious. I orginally was using a modeless dialog but that had
the exact same problem.

Any help would be greatly appreciated!

Thanks,
//Ray

---

John & Annette Elsbree -- elsbree@msn.com
Tuesday, January 23, 1996

Ray -

I think you're trying to use a combination of flags that isn't permitted by 
Windows. I'm not sure the documentation explicitly says it anywhere, but 
common sense would dictate that some of these flags just aren't compatible 
with the WS_CHILD style. In particular, WS_EX_TOPMOST and WS_EX_TOOLWINDOW 
definitely aren't intended for use with child windows.

The documentation *does* explicitly forbid at least one pair of flags that 
you're using together: 

7	WS_CAPTION   Creates a window that has a title bar (implies the WS_BORDER 
style). Cannot be used with the WS_DLGFRAME style.

I don't know exactly what you're trying to do here, but good luck with it!

mfcTeam.m_johnels;	// does not represent Microsoft

----------
From: 	owner-mfc-l@netcom.com on behalf of Ray Marshall

  if ( !CWnd::CreateEx( WS_EX_TOPMOST | WS_EX_TOOLWINDOW, classname, "MyWnd", 
    WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | 
    WS_BORDER | WS_DLGFRAME | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME,
    10, 10, 300, 400, pParent->GetSafeHwnd(), NULL ))

---

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