B4X

XML SearchForAttribute Method

See more XML Examples

Demonstrates the SearchForAttribute method.

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

<root>
    <searchRoot>
        <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>
    </searchRoot>
    <fruit color="red">strawberry</fruit>
    <fruit color="orange">peach</fruit>
</root>

B4X

Dim success As Boolean = False

Dim xml As ChilkatXml
xml.Initialize
Dim xSearchRoot As ChilkatXml
Dim xBeginAfter As ChilkatXml
Dim xFound As ChilkatXml

success = xml.LoadXmlFile("qa_data/xml/fruitSearch.xml")
If success <> True Then
    Log(xml.LastErrorText)
    Return
End If


'  Search the sub-tree rooted at "searchRoot";
xSearchRoot = xml.FindChild("searchRoot")
If xml.LastMethodSuccess = False Then
    Log("searchRoot not found, searching from root.")
    xSearchRoot = xml.GetRoot
End If


'  Search for all "fruit" nodes having a color attribute
'  where the name of the color ends in "e";
xBeginAfter = xSearchRoot.GetSelf
xFound = xSearchRoot.SearchForAttribute(xBeginAfter, "fruit", "color", "*e")
Do While (xSearchRoot.LastMethodSuccess = True)

    Log(xFound.Content & ": " & xFound.GetAttrValue("color"))


    xBeginAfter = xFound
    xFound = xSearchRoot.SearchForAttribute(xBeginAfter, "fruit", "color", "*e")
Loop

'  The correct output is:
'  grape: purple
'  blueberry: blue



Log("--------------------------")

'  ---------------------------------------------------------------------------------
'  Now do the same, but instead use SearchForAttribute2
'  which updates the internal reference of the caller instead
'  of returning the found node.
Dim xSearch As ChilkatXml

xBeginAfter = xSearchRoot.GetSelf
xSearch = xSearchRoot.GetSelf

success = xSearch.SearchForAttribute2(xBeginAfter, "fruit", "color", "*e")
Do While success = True

    Log(xSearch.Content & ": " & xSearch.GetAttrValue("color"))

    '  Copy the internal references so that the next search
    '  begins after the found node.
    xBeginAfter.CopyRef(xSearch)
    xSearch.CopyRef(xSearchRoot)

    success = xSearch.SearchForAttribute2(xBeginAfter, "fruit", "color", "*e")
Loop