Article: Q145996
Product(s): Microsoft C Compiler
Version(s): winnt:
Operating System(s):
Keyword(s): kbCRT kbVC kbVC410fix
Last Modified: 30-JUL-2001
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The information in this article applies to:
- The C Run-Time (CRT), used with:
- *EDITOR Please do not choose this product*Microsoft Visual C++ 32-bit Edition* use 241, 265, 225, versions 4.0, 4.1, 4.2
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SYMPTOMS
========
The CRT function _setmaxstdio does not work properly. The function sets the
maximum number of files an application can open with the stream I/O functions,
like fopen. It is documented in the README book in the online documentation, and
in the Vcread.wri file.
Using _setmaxstdio results in the following error when you exit the program or
call the fopen function:
Unhandled exception in <Project>.exe: 0xC0000005: Access Violation
RESOLUTION
==========
Do not use the _setmaxstdio function. Here are two workarounds:
- Keep track of the number of files opened with fopen, and do not open more
than 512.
-or-
- If the application needs to open more than 512 files, use the low-level I/O
functions: _open, _read, and _write. These allow up to 2048 files to be
opened.
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++ 4.1.
MORE INFORMATION
================
Sample Code to Reproduce Problem
--------------------------------
/* Compile options needed: none
*/
#include <stdio.h>
void main()
{
_setmaxstdio(511);
FILE *text = fopen("textfile.txt","w");
fclose(text);
}
Additional query words: kbVC400bug 4.00 4.10
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Keywords : kbCRT kbVC kbVC410fix
Technology : kbVCsearch kbAudDeveloper kbCRT
Version : winnt:
Issue type : kbbug
Solution Type : kbfix
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