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

ID: Q134888

The information in this article applies to:

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

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

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

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 buglist3.00 FxenvMemory
Version : WINDOWS: 3.0,3.0b,5.0,5.0a,6.0
Platform : WINDOWS
Issue type : kbbug