Knowledge Base

BUG: VCX Corrupted by Saving Two Classes with the Same Name

Article ID: 158239

Article Last Modified on 10/16/2002

APPLIES TO

This article was previously published under Q158239

SYMPTOMS

Saving a class with the same name as another class in a .vcx file corrupts the .vcx file. Trying to run or open a form containing this class causes Visual FoxPro to hang for a while, then the following message appears:
This program has performed an illegal operation and will be shut down.
In Visual FoxPro 6.0, trying to run or modify the form produces the following error message:
Error loading file-record number x. Mybutton1 < or one of its members>.parent: There is not enough memory to complete this operation.
Another error may also appear that shows this error:
There is not enough memory to complete this operation.

WORKAROUND

If you do not type the name of the library in directly, but choose the Browse button to select the library, you get the following message that informs you that you have already used that name.
Cannot Modify a class that is in use.

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 Behavior

  1. Create a command button on a form. On the File menu, click Save As Class. Name the button "Mybutton" and the library "Corrupt."
  2. Open a new form and add corrupt in the View Classes button.
  3. Place Mybutton on the form.
  4. Make some changes to the button.
  5. Click Save As Class again on the file menu.
  6. Name the class Mybutton again.
  7. Type Corrupt under Library.
  8. Save the form, and close Visual FoxPro.
  9. Start Visual FoxPro, and run the form.
The following operations that may also cause a hang followed by the illegal operation message:

  • Opening a new form placing Mybutton from the .vcx file on the form.
  • Trying to modify the form with Mybutton on it.
Opening the .vcx with Mybutton highlighted returns the following message:
Class mybutton is in use by MODIFY CLASS

Additional query words: kbvfp500 kbvfp600

Keywords: kbbug KB158239


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