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Q134888: BUG: GDI Memory Not Released in Windows 95 After Memory Error

Article: Q134888
Product(s): Microsoft FoxPro
Version(s): WINDOWS: 3.0,3.0b,5.0,5.0a,6.0
Operating System(s): 
Keyword(s): kbenv kbvfp300bBUG kbvfp500aBUG kbvfp500bugkbbuglist
Last Modified: 03-AUG-1999

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0 
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SYMPTOMS
========

Running a program that uses up all GDI memory in Windows 95 causes this error:

  Not enough memory to complete this operation

After the error message is closed, GDI memory is still not released. Running the
program a second time causes Visual FoxPro to quit.

STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products listed at
the beginning of this article. We are researching this problem and will post new
information here in the Microsoft Knowledge Base as it becomes available.

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

Steps to Reproduce Problem
--------------------------

1. Run the following program. You will get the error "Not enough memory to
  complete this operation." All GDI has been used and will not be released.

     *Attempt to create and release 2500 windows

     PRIVATE ALL EXCEPT g_*

     cOldPrint = SET('PRINT',1)
     SET PRINT OFF
     SET PRINT TO

     nMaxRows = 25
     nMaxCols = 100

     nBeforeHandles = SYS(1011)

     WAIT WINDOW 'Patience ... may look dead, check system clock' NOWAIT

     FOR i = -1 TO nMaxRows
        FOR j = -1 to nMaxCols
           cWindowName = 'Win'+ALLTRIM(STR(ABS(i)))+'_'+ALLTRIM(STR(ABS(j)))
           DEFINE WINDOW (cWindowName);
              FROM i,j TO i+10,j+10 ;
              TITLE (cWindowName)
           ACTIVATE WINDOW (cWindowName)
        ENDFOR
     ENDFOR
     FOR i = -1 TO nMaxRows
        FOR j = -1 to nMaxCols
           RELEASE WINDOW
        ENDFOR
     ENDFOR

     SET PRINT TO &cOldPrint
     SET PRINT ON

     nAfterHandles = SYS(1011)
     nDiff = VAL(nAfterHandles) - VAL(nBeforeHandles)
     ?IIF(nDiff > 50,'FAIL','PASS')

     * Clean up and exit

     WAIT CLEAR

     RELEASE ALL EXCEPT g_*
     RETURN

2. Run the program again and Visual FoxPro will quit. Then GDI is released.

Additional query words: hang stop dump crash kbvfp300 kbvfp500 kbvfp600

======================================================================
Keywords          : kbenv kbvfp300bBUG kbvfp500aBUG kbvfp500bug kbbuglist
Technology        : kbVFPsearch kbAudDeveloper kbVFP300 kbVFP300b kbVFP500 kbVFP600 kbVFP500a
Version           : WINDOWS: 3.0,3.0b,5.0,5.0a,6.0
Issue type        : kbbug

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

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