(PowerBuilder) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Xml1
oleobject loo_Xml2
string ls_Phrase_id
string ls_Phrase_value
oleobject loo_SbPath
integer i
integer li_Count_i

// 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..

loo_Xml1 = create oleobject
// Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
li_rc = loo_Xml1.ConnectToNewObject("Chilkat.Xml")
if li_rc < 0 then
    destroy loo_Xml1
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Xml1.Tag = "global"
loo_Xml1.UpdateAttrAt("phrase",1,"id","2FADisabled")
loo_Xml1.UpdateAttrAt("phrase",1,"value","2factor authentication disabled")
loo_Xml1.UpdateAttrAt("phrase[1]",1,"id","2FAEnabled")
loo_Xml1.UpdateAttrAt("phrase[1]",1,"value","2factor authentication enabled")
loo_Xml1.UpdateAttrAt("phrase[2]",1,"id","2FAResetFailed")
loo_Xml1.UpdateAttrAt("phrase[2]",1,"value","Failed to disable two factor authentication")

loo_Xml2 = create oleobject
// Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
li_rc = loo_Xml2.ConnectToNewObject("Chilkat.Xml")

loo_Xml2.Tag = "global"
loo_Xml2.UpdateAttrAt("phrase",1,"id","2FAResetFailed")
loo_Xml2.UpdateAttrAt("phrase",1,"value","Failed to reset two factor authentication")
loo_Xml2.UpdateAttrAt("phrase[1]",1,"id","2FADisabled")
loo_Xml2.UpdateAttrAt("phrase[1]",1,"value","2FA authentication disabled")
loo_Xml2.UpdateAttrAt("phrase[2]",1,"id","2FAEnabled")
loo_Xml2.UpdateAttrAt("phrase[2]",1,"value","2FA authentication enabled")

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

loo_SbPath = create oleobject
// Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
li_rc = loo_SbPath.ConnectToNewObject("Chilkat.StringBuilder")

i = 0
li_Count_i = loo_Xml2.NumChildrenHavingTag("phrase")
do while i < li_Count_i
    loo_Xml2.I = i
    ls_Phrase_id = loo_Xml2.ChilkatPath("phrase[i]|(id)")
    ls_Phrase_value = loo_Xml2.ChilkatPath("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"
    loo_SbPath.SetString("/A/phrase,id,")
    loo_SbPath.Append(ls_Phrase_id)

    // This assumes the corresponding element exists in xml1.
    loo_Xml1.UpdateAttrAt(loo_SbPath.GetAsString(),1,"value",ls_Phrase_value)

    i = i + 1
loop

// Now see how xml1 has been updated..
Write-Debug loo_Xml1.GetXml()

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


destroy loo_Xml1
destroy loo_Xml2
destroy loo_SbPath