FIX: DDX for Short Causes Stack Corruption (152384)


The information in this article applies to:

  • Microsoft Visual C++ 4.0
  • Microsoft Visual C++ 4.1
  • Microsoft Foundation Classes (MFC)
This article was previously published under Q152384

SYMPTOMS

Using the Class Wizard to associate a short with a control on a dialog may result in the following behavior:

  • Access Violation when UpdateData(TRUE) is called. -or-

  • Other member variables of the dialog are corrupted after the call to UpdateData(TRUE).

CAUSE

The overloaded DDX routine for short has a bug where it assumes that the variable is of type int instead of short. This may result in stack corruption because a short occupies less space than an int.

RESOLUTION

To resolve this problem, use an int instead of a short. If you want to limit the values to the range of values that can be represented by a short, set the appropriate limits for the int variable.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug was corrected in Visual C++ 32- bit Edition version 4.2.
Modification Type:MajorLast Reviewed:11/18/2003
Keywords:kbBug kbfix kbNoUpdate KbUIDesign kbVC420fix KB152384
©2003 Microsoft Corporation. All rights reserved.