Q132227: PRB: Can’t Activate or Access an Object

Article: Q132227
Product(s): Microsoft FoxPro
Version(s): WINDOWS:3.0
Operating System(s): 
Keyword(s): 
Last Modified: 11-FEB-2000

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, version 3.0 
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SYMPTOMS
========

After you define a class in a program (.PRG file) and run it, nothing happens.
For example, the following code, when run in a .PRG file, executes and return to
the Command window:

     DEFINE CLASS myform AS form
           ADD OBJECT cmd1 as commandbutton WITH ;
                   top = 10, ;
                   left = 10
     ENDDEFINE

CAUSE
=====

A class is simply a template or definition from which an object will be created.
Defining a class does not create an instance of the class.

RESOLUTION
==========

Building on the example above, the code example creates a template from which a
new object can be created. To instantiate the defined class, you must add this
additional code:

        PUBLIC MyForm
     MyForm = CREATEOBJECT("MyForm")  && Create a new object
     MyForm.Show                      && Show the form
     Read Events                      && Keep the event loop alive

     DEFINE CLASS myform AS form
        ADD OBJECT cmd1 as commandbutton WITH ;
           top  = 60, ;
           left = 60
     ENDDEFINE

To cancel this code, click the Command box for this form, and click Close. Then
on the Visual FoxPro menu, on the Program menu, click Cancel.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

For additional information on objects and classes, please see these Help
topics:

- Class, defined.

- Instance, defined.

Additional query words: VFoxWin OOP

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Keywords          :  
Technology        : kbVFPsearch kbAudDeveloper kbVFP300
Version           : WINDOWS:3.0

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