Article ID	2363
Article Title	HOWTO: Enumerate all child objects of a (db)View
Article URL	http://www.dataaccess.com/kbasepublic/KBPrint.asp?ArticleID=2363
KBase Category	Visual DataFlex
Date Created	03/11/2008
Last Edit Date	03/11/2008

Article Text
QUESTION:
How can I scan all the objects contained in a dbView, and query a property
of each object?

SOLUTION:
Add this code to your parent object (or class of that parent) and you can enumerate all child objects of that parent object. It has been tested on a dbView and a dbTabPage.

Function IsChildOfSelf Handle hoId Returns Boolean
    Repeat
        Get Parent of hoId to hoId
    Until (hoId = Self or hoId = 0 or hoId = Desktop)
    
    Function_Return (hoId = Self)
End_Function

Function ChildObjects Returns Handle[]
    Handle[] hoChildren
    Handle hoID
    Integer iCounter
    Boolean bIsChild
    
    For iCounter from 1 to Total_Objects
        Get Object_Id of iCounter to hoID
        If (hoId > 0) Begin
            Get IsChildOfSelf hoID to bIsChild
            If (bIsChild) Begin
                Move hoID to hoChildren[SizeOfArray (hoChildren)]
            End
        End
    Loop
    
    Function_Return hoChildren
End_Function

You can use it with:

Procedure ShowAllChildren
    Handle[] hoChildren
    Integer iElements iElement
    
    Get ChildObjects to hoChildren
    Move (SizeOfArray (hoChildren)) to iElements
    Decrement iElements
    For iElement from 0 to iElements
        Showln "ID: " hoChildren[iElement] " Name=[" (Name (hoChildren[iElement])) "]"
    Loop
End_Procedure

On_Key Key_Alt+Key_F11 Send ShowAllChildren


Contributed By:
Vincent Oorsprong
Company: Data Access Worldwide
email: vincent.oorsprong@dataaccess.eu
Web Site: http://www.dataaccess.eu


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