FIX: CString Functions Right, Left, and Mid May Cause Access Violation

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Article ID: 810448 - View products that this article applies to.
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The CString functions Right, Left, and Mid in Microsoft Foundation Classes (MFC) 7.0 work as expected in debug builds. However, they throw Access Violation error messages in the release builds when a negative index is passed.


A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:;EN-US;CNTACTMS
NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

You must rebuild your application after you install this hotfix.
   Date         Time   Version     Size        File name
   21-Nov-2002  20:20  7.0.9638.0   1,028,096  Mfc70.dll
   21-Nov-2002  19:34  7.0.9638.0   2,068,480  Mfc70d.dll
   21-Nov-2002  20:09  7.0.9638.0   1,016,832  Mfc70u.dll
   21-Nov-2002  19:36  7.0.9638.0   2,064,896  Mfc70ud.dll
   21-Nov-2002  19:35               2,287,020  Mfc70.lib
   21-Nov-2002  19:34               3,066,694  Mfc70d.lib
   21-Nov-2002  19:40               3,042,324  Mfc70u.lib
   21-Nov-2002  19:38               3,978,842  Mfc70ud.lib
   21-Nov-2002  19:54                 505,780  Mfcs70.lib
   21-Nov-2002  19:34                 526,954  Mfcs70d.lib
   21-Nov-2002  19:54                 452,554  Mfcs70u.lib
   21-Nov-2002  19:36                 468,952  Mfcs70ud.lib
   21-Nov-2002  19:30              16,467,902  Nafxcw.lib
   21-Nov-2002  19:29              16,598,876  Nafxcwd.lib
   21-Nov-2002  19:33              16,743,256  Uafxcw.lib
   21-Nov-2002  19:32              17,032,282  Uafxcwd.lib
   22-Nov-2002  00:26                 887,296  Vc_mfc.msm
   11-Nov-2002  22:45                  63,284  Cstringt.h				


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.


Article ID: 810448 - Last Review: February 27, 2014 - Revision: 1.2
  • Microsoft Visual C++ .NET 2002 Standard Edition
  • Microsoft Foundation Class Library 4.2
kbnosurvey kbarchive kberrmsg kbbug kbfix kbqfe kbhotfixserver KB810448

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