DOCERR: Calling Parent Class Method Code Example Is Incorrect

ID: Q134641

The information in this article applies to:

Microsoft Visual FoxPro for Windows, version 3.0

SUMMARY

The Scope Resolution examples shown in the Developer's Guide, page 272, "Calling Parent Class Method Code," are not correct for the released version of Visual FoxPro version 3.0.

MORE INFORMATION

In the Developer's Guide, on page 272, there are two specific examples to call parent class code from the VCR visual class provided as a sample with Visual FoxPro version 3.0. The message being issued does not properly reference the object to which the message is being sent.

The first example, cmdNav::Click(), causes a "This object does not inherit from class CMDNAV" error message. The correct command to execute is:

   VCR.cmdTop::Click

In this particular case, the actual name of the parent class (VCR) and the member of that parent (cmdTop) must be explicitly used in order to properly reference the object where the method to execute is located.

The second example, =EVAL(this.ParentClass + '::Click()', on Page 272 causes a "Missing Expression" error message. The syntax should be:

   =EVAL(This.Parent.Class+"."+This.Name+"::click()")

In this example, This.Parent.Class evaluates to VCR, which is the container Class. And This.Name evaluates to the name of the current object (cmdTop). The result of the evaluation is the same message identified in the first example, VCR.cmdTop::Click.

Additional reference words: 3.00 VFoxWin OOP KBCategory: kbprg kbdocerr KBSubcategory: FxprgClassoop