BUG: Class Not Released After Being Deleted From Form (191311)


The information in this article applies to:

  • Microsoft Visual FoxPro for Windows 5.0
  • Microsoft Visual FoxPro for Windows 5.0a
This article was previously published under Q191311

SYMPTOMS

Attempting to modify a class library, a .vcx file, can cause the following error to occur after you delete it from a form:
Cannot modify a class that is in use.

CAUSE

A reference to the class library remains in memory after deleting the object from the form.

RESOLUTION

Close the form before modifying the class.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This behavior does not occur in Visual FoxPro 6.0.

MORE INFORMATION

Steps to Reproduce Behavior

  1. Create a class based on a Command button and name it Ztest. Save it to a class library named Ztest.vcx.
  2. Create a form and add the Ztest command button to the form.
  3. Click the Ztest Command button class and delete it from the form.
  4. With the form still open, attempt to open and modify the Ztest class library, and the error occurs.
Modification Type:MajorLast Reviewed:12/11/1999
Keywords:kbbug KB191311
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