PureBasic

Iterate over Direct Child Nodes by Index

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Demonstrates some ways to iterate over direct child nodes by index.

The input XML, available at http://www.chilkatsoft.com/data/get_child.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

PureBasic

IncludeFile "CkXml.pb"

Procedure ChilkatExample()

    success.i = 0

    xml.i = CkXml::ckCreate()
    If xml.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    child.i

    ; The sample input XML is available at http://www.chilkatsoft.com/data/get_child.xml
    success = CkXml::ckLoadXmlFile(xml,"get_child.xml")
    If success <> 1
        Debug CkXml::ckLastErrorText(xml)
        CkXml::ckDispose(xml)
        ProcedureReturn
    EndIf

    ; The NumChildren property contains the number of direct
    ; child nodes.  Note: The child nodes under "xyz" are NOT
    ; direct children of "root".  Therefore, the "root" node has
    ; 7 direct children
    Debug "NumChildren = " + Str(CkXml::ckNumChildren(xml))

    ; Iterate over the direct children by index. The first child
    ; is at index 0.
    i.i
    For i = 0 To CkXml::ckNumChildren(xml) - 1
        ;  access the tag and content directly by index:
        Debug Str(i) + ": " + CkXml::ckGetChildTagByIndex(xml,i) + " : " + CkXml::ckGetChildContentByIndex(xml,i)

    Next
    Debug "-----"

    ; Do the same as the above loop, but get the child node
    ; and access the Tag and Content properties:
    For i = 0 To CkXml::ckNumChildren(xml) - 1
        child = CkXml::ckGetChild(xml,i)
        Debug Str(i) + ": " + CkXml::ckTag(child) + " : " + CkXml::ckContent(child)
        CkXml::ckDispose(child)

    Next
    Debug "-----"

    ; Do the same as the above loop, but instead of creating
    ; a new object instance for each child, call GetChild2 to
    ; update the object's reference instead.
    For i = 0 To CkXml::ckNumChildren(xml) - 1
        ; Navigate to the Nth child.  
        success = CkXml::ckGetChild2(xml,i)
        Debug Str(i) + ": " + CkXml::ckTag(xml) + " : " + CkXml::ckContent(xml)
        ; Navigate back up to the parent:
        success = CkXml::ckGetParent2(xml)
    Next
    Debug "-----"

    ; Notice that the Content of the "xyz" node is empty.  This is correct.
    ; The "xyz" node has no Content, but 2 direct children


    CkXml::ckDispose(xml)


    ProcedureReturn
EndProcedure