Bad pointer on CString
in [Visual C]
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From: Alexh on 20 Sep 2009 22:19 Hi all, Using Vista SP2, Visual Studio 2005 - all of a sudden some code that has been working forever and not touched starting giving me a bad pointer on a CString. It couldn't be simpler - class Myclass : public CObject { CString MyCstring; .... The debugger reports that the CString has a bad pointer (all 0's). I tried rebooting, cleaning and rebuilding the entire project. Is it possible something is corrupted and needs to be deleted? Thanks
From: Ulrich Eckhardt on 21 Sep 2009 02:52 Alexh wrote: > Using Vista SP2, Visual Studio 2005 - all of a sudden some code that > has been working forever and not touched starting giving me a bad > pointer on a CString. It couldn't be simpler - > > class Myclass : public CObject > { > > CString MyCstring; > > ... > > The debugger reports that the CString has a bad pointer (all 0's). Looks like an object that is either not fully constructed or already destroyed. Impossible to tell without knowing much more about what you are doing. I suggest you revert back to the commit that caused the error to appear and from there on try to distill a minimal example which you can post here. Well, unless of course you found the mistake yourself on the way. Uli -- C++ FAQ: http://parashift.com/c++-faq-lite Sator Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932
From: Scot T Brennecke on 21 Sep 2009 03:11 Alexh wrote: > Hi all, > > Using Vista SP2, Visual Studio 2005 - all of a sudden some code that > has been working forever and not touched starting giving me a bad > pointer on a CString. It couldn't be simpler - > > class Myclass : public CObject > { > > CString MyCstring; > > ... > > The debugger reports that the CString has a bad pointer (all 0's). > > I tried rebooting, cleaning and rebuilding the entire project. Is it > possible something is corrupted and needs to be deleted? > > Thanks You clipped out some code, of course. My guess is that was has happened is that some other code has overwritten the object that is right next to the CString on the stack, thereby corrupting the internal pointer in the CString object.
From: Alexh on 21 Sep 2009 11:14 On Sep 21, 12:11 am, Scot T Brennecke <Sc...(a)Spamhater.MVPs.org> wrote: > Alexh wrote: > > Hi all, > > > Using Vista SP2, Visual Studio 2005 - all of a sudden some code that > > has been working forever and not touched starting giving me a bad > > pointer on a CString. It couldn't be simpler - > > > class Myclass : public CObject > > { > > > CString MyCstring; > > > ... > > > The debugger reports that the CString has a bad pointer (all 0's). > > > I tried rebooting, cleaning and rebuilding the entire project. Is it > > possible something is corrupted and needs to be deleted? > > > Thanks > > You clipped out some code, of course. My guess is that was has happened is that some other code has overwritten the object that is > right next to the CString on the stack, thereby corrupting the internal pointer in the CString object.- Hide quoted text - > > - Show quoted text - Thanks guys, I took the easy way out and restored a backup.
From: David Webber on 21 Sep 2009 11:26 "Alexh" <alexh1(a)sbcglobal.net> wrote in message news:7fb562ec-a3fe-4faf-8c76-87716709201b(a)f20g2000prn.googlegroups.com... > class Myclass : public CObject > { > > CString MyCstring; > > ... > > The debugger reports that the CString has a bad pointer (all 0's). *When* is it reporting it? It isn't at all clear to me that the internal pointer of a CString cannot legally be NULL. I've always thought it could be, and that the CString methods allowed for it. I can't remember if I ever checked, but even if I did, it may be different in different implementations. But I have always allowed for the possibility that the standard cast (LPCTSTR)my_cstring; might return NULL. If it can, and you assume it doesn't, then you might run into trouble. But (if I'm right) I can't think where else the debugger might report a problem? Dave -- David Webber Author of 'Mozart the Music Processor' http://www.mozart.co.uk For discussion/support see http://www.mozart.co.uk/mozartists/mailinglist.htm
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