Q125577: PC WSPlus: Schedule Access Library GP Faults

Article: Q125577
Product(s): Microsoft Schedule+ for Windows
Version(s): WINDOWS:1.0a
Operating System(s): 
Keyword(s): 
Last Modified: 17-DEC-1999

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The information in this article applies to:

- Microsoft Schedule+ for Windows, version 1.0a 
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SYMPTOMS
========

The Schedule+ Access Libraries include sample Microsoft C and Microsoft Visual
Basic applications. While running the C sample application, SALAPP.EXE, the
following error can occur:

  SALAPP caused a General Protection Fault in module SALAPP.EXE at 0001:58AF

This error is most likely to occur while reading a meeting request sent to the
user.

NOTE: The Schedule+ Access Libraries are included in the Microsoft Mail for PC
Networks Software Development Kit version 3.2.

CAUSE
=====

This error message can be caused by coding errors in the STRUCTS.C file included
with the sample. Any applications written using functions included in this file
could also produce the same error.

RESOLUTION
==========

There are several instances of the same error in the STRUCTS.C file. The error
involves the use of the GlobalAlloc() function and subsequent usage of the
_fstrcpy() function.

The problem occurs because the lstrlen() function counts the characters in the
string parameter but does not count the zero character that terminates the
string. The _fstrcpy() will copy the string and the trailing null character that
can be one more character than the GlobalAlloc() function allowed.

To correct the code, update the STRUCTS.C file by adding one additional byte to
the count returned by the lstrlen() function. The following is an example:

(originally)

     GlobalAlloc(GMEM_MOVEABLE,lstrlen(lpApptIn->lpszItemType));

(change to)

     GlobalAlloc(GMEM_MOVEABLE,lstrlen(lpApptIn->lpszItemType)+1);

These changes need to be made in 14 places in the STRUCTS.C file; one for each
occurrence of the lstrlen function. Search the file for lstrlen and correct the
GlobalAlloc() function that contains each instance.

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

The occurrence of a general protection fault (GP fault) is intermittent. This is
because the GlobalAlloc function may allocate more memory than is requested in
the call. The amount specified is the minimum amount that the function will
allocate. The problem occurs frequently when the subject line of the meeting
request is exactly 32 characters.


Additional query words: schedule plus 1.00a salapp sal gp-fault

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Keywords          :  
Technology        : kbScheduleSearch kbSchedule100a
Version           : WINDOWS:1.0a

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