Article ID: 145996
Article Last Modified on 12/9/2003
APPLIES TO
- The C Run-Time (CRT), when used with:
- Microsoft Visual C++ 4.0 Professional Edition
- Microsoft Visual C++ 4.1 Subscription
- Microsoft Visual C++ 4.2 Professional Edition
- Microsoft Visual C++ 4.2 Enterprise Edition
- Microsoft Visual C++ 5.0 Learning Edition
- Microsoft Visual C++ 5.0 Learning Edition
This article was previously published under Q145996
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:
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
Keywords: kbbug kbfix kbcrt kbvc410fix KB145996
