PRB: Error Instantiating Object

• Microsoft Visual FoxPro for Windows, version 3.0

SYMPTOMS

CreateObject(), when used with a class defined from a wizard-generated form, produces this error:

Error Instantiating Object

CAUSE

When you save a form as a class, you lose the DataEnvironment information. Also, the wizard-generated code is brought beyond its original scope, therefore an instance cannot be generated.

RESOLUTION

Recreate the original form by hand, and then recreate the class. Creating the DataEnvironment before instantiating the object will get you around the error, but not the loss of functionality and other wizard-generated form class issues.

STATUS

This behavior is by design.

MORE INFORMATION

NOTE: The wizard-generated code is no longer part of any explicit event, which causes a number of variables to either fall out of scope, or not be initialized properly, and will result in multiple runtime errors. This will cause the creation of an instance and/or the use of the form as a class to fail.

Steps to Reproduce Behavior

1. Using the Form Wizard, create a form, and save it as a class called Mine in the library Myclass.



2. Run the following in a program:

   
      SET CLASSLIB TO D:\Vfp\Myclass ADDITIVE
      x = CreateObject('Mine')
      && The error occurs here
      x.Show
      READ EVENTS 

Additional query words: VFoxWin

Keywords : FxtoolWizother
Version : 3.00
Platform : WINDOWS
Issue type :