Codejock Developer Community : SubclassWindow of CXTPMDIFrameWnd fails http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 13 May 2026 20:40:55 +0000 Mon, 14 Jan 2008 09:41:17 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=9300 <![CDATA[Codejock Developer Community]]> http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ <![CDATA[SubclassWindow of CXTPMDIFrameWnd fails : No, I derive my CMainFrame from...]]> http://forum.codejock.com/forum_posts.asp?TID=9300&PID=30109&title=subclasswindow-of-cxtpmdiframewnd-fails#30109 Author: alistair.m
Subject: 9300
Posted: 14 January 2008 at 9:41am

No, I derive my CMainFrame from CXTPMDIFrameWnd. The document type we use is a fixed size dialog so doesn't really work with a tabbed client format.

Thanks
Al.
]]> Mon, 14 Jan 2008 09:41:17 +0000 http://forum.codejock.com/forum_posts.asp?TID=9300&PID=30109&title=subclasswindow-of-cxtpmdiframewnd-fails#30109 <![CDATA[SubclassWindow of CXTPMDIFrameWnd fails : Hi, Do you use CXTPTabClientWnd...]]> http://forum.codejock.com/forum_posts.asp?TID=9300&PID=30104&title=subclasswindow-of-cxtpmdiframewnd-fails#30104 Author: Oleg
Subject: 9300
Posted: 14 January 2008 at 9:35am

Hi,
Do you use CXTPTabClientWnd ?
]]> Mon, 14 Jan 2008 09:35:53 +0000 http://forum.codejock.com/forum_posts.asp?TID=9300&PID=30104&title=subclasswindow-of-cxtpmdiframewnd-fails#30104 <![CDATA[SubclassWindow of CXTPMDIFrameWnd fails : Hi allI&#039;m trying to get a...]]> http://forum.codejock.com/forum_posts.asp?TID=9300&PID=30103&title=subclasswindow-of-cxtpmdiframewnd-fails#30103 Author: alistair.m
Subject: 9300
Posted: 14 January 2008 at 7:23am

Hi all

I'm trying to get a subclass working that used to work in my non CodeJock app. Now CMainFrame is derived from CXTPMDIFrameWnd, it asserts at the FromHandlePermanent(hWndNew) in CWnd::Attach(). I assume this is because the CodeJock parent class already has some form of subclassing and you can't subclass twice.

The subclassed class simply overrides OnEraseBkgnd and OnSize and paints text to the MDI frame background as described in many tutorials and examples on the net.
In my CMainFrame::OnCreate() I call:

//subclass to allow erasebkgnd to repaint colour of mainframe
CWnd* pChildWnd = GetWindow(GW_CHILD);
if (pChildWnd)
{
    if (!m_wndMDIClient.SubclassWindow (pChildWnd -> m_hWnd)) {
        TRACE ("Failed to subclass MDI client window\n");
        return (-1);
    }
}

Any thoughts on how I can re-implement this functionality.
Thanks
Al.

]]> Mon, 14 Jan 2008 07:23:07 +0000 http://forum.codejock.com/forum_posts.asp?TID=9300&PID=30103&title=subclasswindow-of-cxtpmdiframewnd-fails#30103