FIX: GPF/UAE with Huge Array Size as Multiple of 64K Bytes

 Last reviewed: October 30, 1997
Article ID: Q98990
2.00 WINDOWS kbenv kbbuglist

The information in this article applies to:

- Standard and professional editions of Microsoft Visual Basic programming 

  system for Windows, version 2.0

SYMPTOMS

A general protection (GP) fault or Unrecoverable Application Error (UAE) may result when you define a huge array using DIM, REDIM, or GLOBAL and specify a size that's a multiple of 64K.

CAUSE

Huge arrays that cause a GP fault or UAE are a(n), where n is 4094 + 4095*i for i = 1 to 7 (assuming 16-byte element sizes). The problem occurs when the array plus its overhead fills a space of 128K and each increment of 64K exactly.

WORKAROUND

To work around the problem, add or subtract one element in the array.

STATUS

Microsoft has confirmed this to be a bug in Microsoft Visual Basic version 2.0 for Windows. This bug was corrected in Microsoft Visual Basic version 3.0 for Windows.

MORE INFORMATION

Steps to Reproduce the Problem

1. Start Visual Basic, or if Visual Basic is already running, choose New 
   Project from the File menu (ALT, F, N).

  • Add the following code to the Form_Click event procedure of Form1:

    Form_Click () 

           ReDim A(32759) As Variant

       End Sub


  • From the Run menu, choose Start (ALT, R, S).

    
At this point, a GP fault or UAE occurs. The GP fault address is 0001:0CA2.

    

	
	
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Additional reference words: buglist2.00 fixlist3.00 2.00
    
KBCategory: kbenv kbbuglist
    
KBSubcategory: EnvtRun
    
Solution Type     : kbfix
    

    
    

    

    
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	Last reviewed:  October 30, 1997
	
    
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