(PureBasic) Find and Update an XML Attribute Value

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Demonstrates how to find an element in XML with a specified attribute name and then update the attribute value.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkXml.pb"

Procedure ChilkatExample()

    ; Let's say you have 2 XML files with identical structures as shown directly below,
    ; and you wish to update the values in the 1st XML file with those in the 2nd XML file.

    ; <global>
    ;     <phrase id="2FADisabled" value="2factor authentication disabled"/>
    ;     <phrase id="2FAEnabled" value="2factor authentication enabled"/>
    ;     <phrase id="2FAResetFailed" value="Failed to disable two factor authentication"/>
    ; </global>

    ; <global>
    ;     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
    ;     <phrase id="2FADisabled" value="2FA authentication disabled"/>
    ;     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
    ; </global>

    ; First, initialize each of the Chilkat XML objects.
    ; These could be loaded from files, but we'll just create them manually for this example..

    xml1.i = CkXml::ckCreate()
    If xml1.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkXml::setCkTag(xml1, "global")
    CkXml::ckUpdateAttrAt(xml1,"phrase",1,"id","2FADisabled")
    CkXml::ckUpdateAttrAt(xml1,"phrase",1,"value","2factor authentication disabled")
    CkXml::ckUpdateAttrAt(xml1,"phrase[1]",1,"id","2FAEnabled")
    CkXml::ckUpdateAttrAt(xml1,"phrase[1]",1,"value","2factor authentication enabled")
    CkXml::ckUpdateAttrAt(xml1,"phrase[2]",1,"id","2FAResetFailed")
    CkXml::ckUpdateAttrAt(xml1,"phrase[2]",1,"value","Failed to disable two factor authentication")

    xml2.i = CkXml::ckCreate()
    If xml2.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkXml::setCkTag(xml2, "global")
    CkXml::ckUpdateAttrAt(xml2,"phrase",1,"id","2FAResetFailed")
    CkXml::ckUpdateAttrAt(xml2,"phrase",1,"value","Failed to reset two factor authentication")
    CkXml::ckUpdateAttrAt(xml2,"phrase[1]",1,"id","2FADisabled")
    CkXml::ckUpdateAttrAt(xml2,"phrase[1]",1,"value","2FA authentication disabled")
    CkXml::ckUpdateAttrAt(xml2,"phrase[2]",1,"id","2FAEnabled")
    CkXml::ckUpdateAttrAt(xml2,"phrase[2]",1,"value","2FA authentication enabled")

    ; Iterate over attribute values in xml2 and update the same in xml1.

    phrase_id.s
    phrase_value.s

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

    i.i = 0
    count_i.i = CkXml::ckNumChildrenHavingTag(xml2,"phrase")
    While i < count_i
        CkXml::setCkI(xml2, i)
        phrase_id = CkXml::ckChilkatPath(xml2,"phrase[i]|(id)")
        phrase_value = CkXml::ckChilkatPath(xml2,"phrase[i]|(value)")

        ; Notice how the UpdateAttrAt method's 1st argument is a Chilkat path -- which is an expression
        ; to find the location of the XML element to be updated.
        ; Here we create a path of the form "/A/tagName,attributeName,attributeValuePattern", which means
        ; find the direct descendent of xml2 having tag=tagName, with an attribute=attributeName where the attribute value
        ; matches the attributeValuePattern.  If attributeValuePattern does not contain a "*", then it must match directly.
        ; We'll build a Chilkat path such as "/A/phrase,id,2FADisabled"
        CkStringBuilder::ckSetString(sbPath,"/A/phrase,id,")
        CkStringBuilder::ckAppend(sbPath,phrase_id)

        ; This assumes the corresponding element exists in xml1.
        CkXml::ckUpdateAttrAt(xml1,CkStringBuilder::ckGetAsString(sbPath),1,"value",phrase_value)

        i = i + 1
    Wend

    ; Now see how xml1 has been updated..
    Debug CkXml::ckGetXml(xml1)


    CkXml::ckDispose(xml1)
    CkXml::ckDispose(xml2)
    CkStringBuilder::ckDispose(sbPath)


    ProcedureReturn
EndProcedure