DataFlex

Iterate over Direct Child Nodes by Index

See more XML Examples

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>

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoXml
    Variant vChild
    Handle hoChild
    Integer i
    String sTemp1
    String sTemp2
    Integer iTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End

    // The sample input XML is available at http://www.chilkatsoft.com/data/get_child.xml
    Get ComLoadXmlFile Of hoXml "get_child.xml" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoXml To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // 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
    Get ComNumChildren Of hoXml To iTemp1
    Showln "NumChildren = " iTemp1

    // Iterate over the direct children by index. The first child
    // is at index 0.

    Get ComNumChildren Of hoXml To iTemp1
    For i From 0 To (iTemp1 - 1)
        //  access the tag and content directly by index:
        Get ComGetChildTagByIndex Of hoXml i To sTemp1
        Get ComGetChildContentByIndex Of hoXml i To sTemp2
        Showln i ": " sTemp1 " : " sTemp2

    Loop

    Showln "-----"

    // Do the same as the above loop, but get the child node
    // and access the Tag and Content properties:
    Get ComNumChildren Of hoXml To iTemp1
    For i From 0 To (iTemp1 - 1)
        Get ComGetChild Of hoXml i To vChild
        If (IsComObject(vChild)) Begin
            Get Create (RefClass(cComChilkatXml)) To hoChild
            Set pvComObject Of hoChild To vChild
        End
        Get ComTag Of hoChild To sTemp1
        Get ComContent Of hoChild To sTemp2
        Showln i ": " sTemp1 " : " sTemp2
        Send Destroy of hoChild
    Loop

    Showln "-----"

    // 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.
    Get ComNumChildren Of hoXml To iTemp1
    For i From 0 To (iTemp1 - 1)
        // Navigate to the Nth child.  
        Get ComGetChild2 Of hoXml i To iSuccess
        Get ComTag Of hoXml To sTemp1
        Get ComContent Of hoXml To sTemp2
        Showln i ": " sTemp1 " : " sTemp2
        // Navigate back up to the parent:
        Get ComGetParent2 Of hoXml To iSuccess
    Loop

    Showln "-----"

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


End_Procedure