Android Question Xml2Map - Compilation error

[Indy]

Hi,

I'm trying to use Xml2Map class to get values from XML that is passed back from a WCF. I followed the example in the first post to loop through the data from the XML string but, changed the XML references as per my output, however I get a compilation error as follows;

Compiling generated Java code.    Error
B4A line: 105
For Each res As Map In root.Get(\
javac 1.8.0_131
src\b4a\example\main.java:485: error: incompatible types: Object cannot be converted to IterableList
group26 = _root.Get((Object)("GetDataResponse"));

Here's the XML response from the WCF;

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header>
    <ActivityId CorrelationId="8709d988-7118-46e3-a65f-4d81be46993e" xmlns="http://schemas.microsoft.com/2004/09/ServiceModel/Diagnostics">a98d95ae-573d-4636-aadc-738ee383269e</ActivityId>
  </s:Header>
  <s:Body>
    <GetDataResponse xmlns="http://tempuri.org/">
      <GetDataResult>You entered: 100</GetDataResult>
    </GetDataResponse>
  </s:Body>
</s:Envelope>

The B4X code I'm using is as follows;

Dim xm As Xml2Map
xm.Initialize
       
ParsedData = xm.Parse(strXMLResponse)
       
Dim root As Map = ParsedData.Get("Body")     
           
For Each res As Map In root.Get("GetDataResponse")
         
Next

Have I missed something in my code?

Thanks.

 

[Erel]

For Each res As Map In root.Get("GetDataResponse")

This line is the problem as the compiler doesn't know the stored type.

What is the output of Log(root) ?

 

[Indy]

This line is the problem as the compiler doesn't know the stored type.

What is the output of Log(root) ?

It says...

(Map) Not initialized

Thanks.

 

[Erel]

I should have asked: what is the output of Log(ParsedData) ?

Worth seeing the web services tutorial. I go over XML parsing in the second example.
https://www.b4x.com/etp.html

 

[Indy]

Hi Erel,

ParseData contains

(MyMap) {Envelope={Header={ActivityId={Attributes={CorrelationId=8e40d0fb-0e7b-4d33-92c9-795877a52929}, Text=ed778225-a20f-4c6f-8410-acef76d1217d}}, Body={GetDataResponse={GetDataResult=You entered: 11}}}}

I'll be honest with you, what puzzles me is why the error during compilation? Surely it can't know what XML tags to expect until the app actually runs. The only thing I can think of is, all the examples for this load an XML file whereas I want to pass in XML. Do you think the complier loads in the file before and then validates the tags at compilation time?

Thanks.

 

[Erel]

'll be honest with you, what puzzles me is why the error during compilation?

This line cannot be compiled as the compiler cannot use an Object in a For Each loop.

For Each res As Map In root.Get("GetDataResponse")

The first step is to format the maps data:

To get the "GetDataResult" element:

Dim Envelope As Map = ParsedData.Get("Envelope")
Dim Body As Map = Envelope.Get("Body")
Dim GetDataResponse As Map = Body.Get("GetDataResponse")
Dim result As String = GetDataResponse.Get("GetDataResult")

 

[Indy]

Hi Erel,

I see where I was going wrong. I have used your code and it works. However, what I've now done is to try and extend that to loop through a collection of data. So, for example I now have the following data (from ParseData)

(MyMap) {Envelope={Header={ActivityId={Attributes={CorrelationId=06889bd3-b674-4db9-aa51-dcb216e3a85e}, Text=10c59f8d-a4c8-4e0e-afa2-369aa57722e7}}, Body={GetDataListResponse={GetDataListResult={string=[A, B, C]}}}}}

I tried the following code but got an error.

Dim Envelope As Map = ParsedData.Get("Envelope")
Dim Body As Map = Envelope.Get("Body")
Dim GetDataListResponse As Map = Body.Get("GetDataListResponse")
Dim GetDataListResult As Map = GetDataListResponse.Get("GetDataListResult")
Dim GetDataListValues As Map = GetDataListResult.Get("string")
           
For Each res As String In GetDataListValues.Values
    Msgbox(res,"")           
Next

main$ResumableSub_Button1_Clickresume (java line: 525)
java.lang.ClassCastException: java.util.ArrayList cannot be cast to anywheresoftware.b4a.objects.collections.Map$MyMap
at b4a.example.main$ResumableSub_Button1_Click.resume(main.java:525)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:240)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:180)
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1135)
at android.os.Handler.handleCallback(Handler.java:743)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5546)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)

Can you tell where I've gone wrong?

Thanks.

 

[DonManfred]

try

dim GetDataListValues As list = GetDataListResult.Get("string")

 

[Indy]

Hi DonManfred

Worked perfectly! Now I'm able to retreive single and multiple values from the WCF service.

Thank you both Erel and DonManfred for your help.

Thanks