Microsoft KB Archive/158755

= FIX: CLEAR ALL with Object References Causes Page Fault =

Article ID: 158755

Article Last Modified on 3/24/2000

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APPLIES TO


 * Microsoft Visual FoxPro 5.0 Standard Edition

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This article was previously published under Q158755



SYMPTOMS
If there are objects that reference each other, Visual FoxPro displays the following error message when CLEAR ALL is carried out:

This Program has performed an illegal operation and will be shut down.

Visual FoxPro terminates due to an Invalid Page Fault.



WORKAROUND
Delete object references before carrying out CLEAR ALL.



STATUS
Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. This has been corrected in Visual FoxPro 6.0.



Steps to Reproduce Behavior
  Create and run a program containing the following code: oform = CreateObject( "Form" ) oform.AddObject("X", "CB") oform.AddObject("Y", "CB") oform.y.pointer=oform.x     oform.x.pointer=oform.y      CLEAR ALL  && This causes an Invalid Page Fault and && shuts down Visual FoxPro.

DEFINE CLASS CB as CommandButton pointer= .NULL. ENDDEFINE 

Object references for "X" and "Y" above can be cleared by doing the following: oform.removeobject("X") oform.removeobject("Y")

Additional query words: vfoxwin kbdsd kbvfp500 kbvfp600fix

Keywords: kberrmsg kbbug kbfix KB158755

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