Microsoft KB Archive/156341

= PRB: Cannot Load the Same Class Library More Than Once =

Article ID: 156341

Article Last Modified on 10/15/2003

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APPLIES TO


 * Microsoft Visual FoxPro 5.0 Standard Edition
 * Microsoft Visual FoxPro 6.0 Professional Edition

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This article was previously published under Q156341



SYMPTOMS
Visual FoxPro version 5.0 does not allow you to load the same class library more than once, using the "SET CLASSLIB... ALIAS ... ADDITIVE" command.



WORKAROUND
If you want to load the same class library multiple times, you have to create multiple copies of the same class library in different directories and then load each one. Following is an example to do so:   SET CLASSLIB TO

**Make a temp directory in the HOME directory** MD HOME+'temp'

**Copy the Class Library files to the temp directory** COPY FILE HOME+'wizards\wizstyle.vc?' to HOME+'temp\wizstyle.vc?'

**Load First instance of the Class Library** SET CLASSLIB TO HOME+'wizards\wizstyle' ALIAS one

**Display the Class Library(ies) Loaded into memory** ?SET('CLASSLIB') **The above command will display the First Library**

**Load second instance of the Class Library SET CLASSLIB TO HOME+'temp\wizstyle' ALIAS two ADDITIVE

**Display the Class Library(ies) Loaded into memory** ?SET('CLASSLIB') **The above command will display both instances of the library**



STATUS
This behavior is by design.



Steps to Reproduce Behavior
The following steps demonstrate that, although the second instance of the Class Library is opened using the ALIAS and ADDITIVE clause, the first instance of the same class is closed, and only the second instance of the Class remains loaded into memory:

  Issue the following commands from the Command window: SET CLASSLIB TO HOME+ "Wizards\Wizstyle" ALIAS One ?SET("Classlib")

The ?SET("Classlib") command displays the following:

..\Vfp\Wizards\Wizstyle.vcx ALIAS One   Issue the following commands from the Command window: SET CLASSLIB TO HOME+ "Wizards\Wizstyle" ALIAS Two ADDITIVE ?SET("Classlib")

The ?SET("Classlib") command displays the following:

..\Vfp\Wizards\Wizstyle.vcx ALIAS Two 

Additional query words: kbdse VFoxWin

Keywords: KB156341

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