FIX: CHRTRAN(), CHRTRANC(), and FULLPATH() May Cause GPF Errors (182249)
The information in this article applies to:
- Microsoft Visual FoxPro for Windows 5.0
- Microsoft Visual FoxPro for Windows 5.0a
This article was previously published under Q182249 SYMPTOMS
Visual FoxPro 5.0x produces random General Protection Faults or other
memory related errors in the development or run-time environment and in
Visual FoxPro OLE Automation Servers. Often, these errors are random and
difficult, if not impossible, to reproduce consistently.
CAUSE
In certain circumstances the CHRTRAN(), CHRTRANC(), and FULLPATH()
functions are reading past the allocated buffer in memory.
RESOLUTION
Use another string manipulation function to replace CHRTRAN(), CHRTRANC()
or FULLPATH(). Check the Help file topic of each of the three functions and
press the "See Also" jump for alternate functions that may be helpful.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article. This has been corrected in Visual FoxPro
6.0.
MORE INFORMATION
These functions do not produce errors each time they are used. Often, a
programmer can rely on these functions to work without causing a problem.
The success or failure of these functions depends on how memory is
allocated in Visual FoxPro at a given time. Therefore, one application may
work fine while another produces memory errors. Since Visual FoxPro's
internal memory allocation depends on many factors that the programmer does
not control, the problem may appear intermittently.
This problem occurs most frequently when Visual FoxPro 5.0x runs on Windows
NT 4.0 computers. However, this behavior may also occur on Windows 95
computers. Anytime you experience random memory problems that are difficult
to reproduce, remove any occurrences of the FULLPATH(), CHRTRANC(), and
CHRTRAN() functions and retest the application.
Currently, we do not have a programmatic scenario that reliably reproduces
the behavior. If you develop a code example that duplicates this behavior,
please contact Microsoft Product Support Services.
REFERENCES
Visual FoxPro Help; search on: "FULLPATH()"; "CHRTRAN()"; "CHRTRANC()"
| Modification Type: | Major | Last Reviewed: | 8/10/1999 |
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| Keywords: | kbbug KB182249 |
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