KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q90854: PRB: Accented Characters in Filename Controls Lose Accents

Article: Q90854
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.1
Operating System(s): 
Keyword(s): kb16bitonly kbComboBox kbCtrl kbEditCtrl kbSDKPlatform kbGrpDSUser
Last Modified: 12-JUN-1999

3.00 3.10
WINDOWS
kbprg kbprb

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows Software Development Kit (SDK) 3.1 
-------------------------------------------------------------------------------

SYMPTOMS
========

In an application for the Microsoft Windows graphical environment that uses a
combo box with the CBS_OEMCONVERT style or an edit control with the
ES_OEMCONVERT style, the user enters a character with an accent mark, and the
accent is lost.

CAUSE
=====

The OEMCONVERT control styles convert all input as follows:

- Convert lowercase letters to uppercase letters with the AnsiUpper function.

- Convert all characters from the ANSI character set to the installed OEM
  character set with the AnsiToOem function.

- Convert the appropriate characters back to lowercase letters with the
  AnsiLower function.

Because the OEM character set installed in most computers (code page 437) does
not include representation for the capital letters with accent marks, the accent
marks are lost in this conversion process. This occurs in all versions of
Windows, including those designed for use outside the United States.

RESOLUTION
==========

Unicode specifies a unified character set that can represent every active
language and many dead languages. Windows NT incorporates support for Unicode.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

For further details on the cause of this problem, see the article by Dr. William
S. Hall "Adapt Your Program for Worldwide Use with Windows Internationalization
Support," starting on page 29 of the Nov-Dec 1991 Microsoft Systems Journal.

Additional query words: 3.00

======================================================================
Keywords          : kb16bitonly kbComboBox kbCtrl kbEditCtrl kbSDKPlatform kbGrpDSUser 
Technology        : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310
Version           : WINDOWS:3.1
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.