Codejock Developer Community : Crash inside CXTPFontDC::SetFont() http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 10 Jun 2026 19:33:24 +0000 Mon, 22 Oct 2007 06:52:16 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=8031 <![CDATA[Codejock Developer Community]]> http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ <![CDATA[Crash inside CXTPFontDC::SetFont() : Thanks for the suggestion - it...]]> http://forum.codejock.com/forum_posts.asp?TID=8031&PID=27525&title=crash-inside-cxtpfontdcsetfont#27525 Author: akur
Subject: 8031
Posted: 22 October 2007 at 6:52am

Thanks for the suggestion - it helped to avoid the crash so far.
I guess there must be some problem with how MFC maintains its map of temporary CDC objects.
]]> Mon, 22 Oct 2007 06:52:16 +0000 http://forum.codejock.com/forum_posts.asp?TID=8031&PID=27525&title=crash-inside-cxtpfontdcsetfont#27525 <![CDATA[Crash inside CXTPFontDC::SetFont() : Hello, Please try to rewrite...]]> http://forum.codejock.com/forum_posts.asp?TID=8031&PID=26063&title=crash-inside-cxtpfontdcsetfont#26063 Author: Oleg
Subject: 8031
Posted: 18 September 2007 at 2:20am

Hello,
 
Please try to rewrite CXTPCommandBar::OnPrintClient as
 
 CDC dc;
 dc.Attach((HDC)wParam);
 DrawCommandBar(&dc, CXTPClientRect(this));
 dc.Detach();
 
and check if you can reproduce it.
 
Thanks
]]> Tue, 18 Sep 2007 02:20:17 +0000 http://forum.codejock.com/forum_posts.asp?TID=8031&PID=26063&title=crash-inside-cxtpfontdcsetfont#26063 <![CDATA[Crash inside CXTPFontDC::SetFont() : Hello,the WM_PRINT is sent by...]]> http://forum.codejock.com/forum_posts.asp?TID=8031&PID=26003&title=crash-inside-cxtpfontdcsetfont#26003 Author: akur
Subject: 8031
Posted: 17 September 2007 at 5:57am

Hello,
the WM_PRINT is sent by the system (Vista) itself, so I guess the device context should be valid. Plus, its validity is checked in your code inside CXTPCommandBar::DrawCommandBar(), so I think this is not the problem.

However, maybe the CDC object itself - acquired inside CXTPCommandBar::OnPrint() - can be deleted somehow, thus a non-valid object is dereferenced inside the ctor of CXTPFontDC. What do you think, how can this happen? I've got no good explanation for this, since MFC should delete temporary CDC objects only during OnIdle() - but that's _not_ our case, since we're still inside the processing of the same WM_PRINT message.

I'm affraid we cannot replace our specialized, owner-draw combobox with a CXTPControl-based class. Do you have any other idea how to get around this crash?
Thank you, in advance!

]]> Mon, 17 Sep 2007 05:57:52 +0000 http://forum.codejock.com/forum_posts.asp?TID=8031&PID=26003&title=crash-inside-cxtpfontdcsetfont#26003 <![CDATA[Crash inside CXTPFontDC::SetFont() : Hi, Looking to code and call...]]> http://forum.codejock.com/forum_posts.asp?TID=8031&PID=25994&title=crash-inside-cxtpfontdcsetfont#25994 Author: Oleg
Subject: 8031
Posted: 17 September 2007 at 5:26am

Hi,
 
Looking to code and call stack I can say that it can happen only if something send not valid device context with WM_PRINT message.
 
try to remove this comboxbox and check if problem can be reproduced. May be you can replace it to our CXTPControlComboBox ?
]]> Mon, 17 Sep 2007 05:26:01 +0000 http://forum.codejock.com/forum_posts.asp?TID=8031&PID=25994&title=crash-inside-cxtpfontdcsetfont#25994 <![CDATA[Crash inside CXTPFontDC::SetFont() : The call stack comes from...]]> http://forum.codejock.com/forum_posts.asp?TID=8031&PID=25986&title=crash-inside-cxtpfontdcsetfont#25986 Author: akur
Subject: 8031
Posted: 17 September 2007 at 2:45am

The call stack comes from processing WM_PRINT or WM_PRINTCLIENT messages which is what e.g. plain combobox controls are sent to on Vista systems when you e.g. hover your mouse over them. However, the crash doesn't happen during hovering. It just happens when working with any other parts of the application.

We have one such plain combobox inserted as a custom control in an XTP toolbar. Do you think this can cause any problems somehow?

]]> Mon, 17 Sep 2007 02:45:58 +0000 http://forum.codejock.com/forum_posts.asp?TID=8031&PID=25986&title=crash-inside-cxtpfontdcsetfont#25986 <![CDATA[Crash inside CXTPFontDC::SetFont() : Hello,we&#039;ve got access...]]> http://forum.codejock.com/forum_posts.asp?TID=8031&PID=25985&title=crash-inside-cxtpfontdcsetfont#25985 Author: akur
Subject: 8031
Posted: 17 September 2007 at 2:43am

Hello,

we've got access violation crashes inside the CXTPFontDC class. This is how the call stack looks like (excerpt from a Release build's crashdump):



It happens sporadically from time to time (like once a week), but on 3 different computers at least. All these computers run Vista Business or Vista Ultimate and all of them are dual-core processors. Don't know if it matters.

Do you have any idea how to fix or any workaround for this?
Thanks a lot, in advance!


]]> Mon, 17 Sep 2007 02:43:12 +0000 http://forum.codejock.com/forum_posts.asp?TID=8031&PID=25985&title=crash-inside-cxtpfontdcsetfont#25985