Q73511: FIX: CodeView Cannot Display Data in a Huge Array Beyond 64k

Article: Q73511
Product(s): Microsoft Programming Utilities
Version(s): 3.0,3.05,3.06,3.07,3.11,3.12,3.14,3.5,4.0,4.01,4.05,4.1
Operating System(s): 
Keyword(s): kb16bitonly
Last Modified: 26-JUN-2001

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The information in this article applies to:

- Microsoft CodeView for MS-DOS, versions 3.0, 3.11, 3.14, 4.0, 4.01, 4.05, 4.1 
- Microsoft CodeView for OS/2, versions 3.0, 3.11, 3.12, 3.5 
- Microsoft CodeView for Windows, versions 3.0, 3.05, 3.06, 3.07, 4.0, 4.01, 4.1 
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SYMPTOMS
========

A huge array that contains more than 64K (65535) bytes of data cannot be fully
expanded in Microsoft CodeView. Both the Watch and Quick Watch windows only
allow the display of the first 64K of data in a huge data structure.

STATUS
======

Microsoft has confirmed this to be a problem in the versions of CodeView listed
above. This problem was corrected in CodeView version 4.1.

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

The example code below demonstrates this limitation. Compile and link the
program for huge memory model (/AH) and specify CodeView debugging information
(/Zi). Bring the program up in CodeView and set a watch on big_array, which is a
huge array of 10000 doubles (80000 bytes). Expand the array by clicking on it in
the Watch window with the mouse or by moving the cursor to it and pressing
ENTER.

At this point, you can scroll down through the array, but the only visible array
elements will be 0 through 8191 (65536 bytes).

Sample Code
-----------

  /* Compile options needed: /AH /Zi /Od
  */ 

  #include <stdio.h>

  double big_array[10000];

  void main( void)
  {
     int i;
     double d;
     for( i = 0, d = 0.0f ; i < 10000 ; i++, d += 0.01)
        big_array[i] = d;

     for( i = 0 ; i < 10000 ; i++)
        printf( "big_array[%d] = %2.2f\n", i, big_array[i]);
  }

Additional query words: 3.00 3.50 4.00

======================================================================
Keywords          : kb16bitonly 
Technology        : kbAudDeveloper kbCodeView kbZNotKeyword3 kbCodeView300DOS kbCodeView311DOS kbCodeView314DOS kbCodeView400DOS kbCodeView401DOS kbCodeView405DOS kbCodeView410DOS kbCodeView300OS2 kbCodeView311OS2 kbCodeView312OS2 kbCodeView350OS2 kbCodeView300 kbCodeView305 kbCodeView306 kbCodeView307 kbCodeView400 kbCodeView401 kbCodeView410
Version           : :3.0,3.05,3.06,3.07,3.11,3.12,3.14,3.5,4.0,4.01,4.05,4.1
Solution Type     : kbfix

=============================================================================

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