How to read from a JSON File and convert to HL7 message

Question

Question

Joe Jones · Mar 17, 2023

#Error Handling #JSON #ObjectScript #Ensemble

Hi Community,

I am trying to read a JSON file and convert into HL7 message.Please find the example below

Set Jsonobj={"Doctype":"ADT^A01","PatientId":"123","PatientName":"Alex"}

Set Dynjsonobj= ##class(%Library.DynamicObject).%FromJSON(Jsonobj)

Error :<THROW>%FromJSON+37^%Library.DynamicAbstractObject.1 *%Exception.General READ error while reading input stream 10 Line 1 Offset 0

I am getting this error while reading the file,Can you please tell me where i am doing wrong in converting the file?

Joe

Product version: Ensemble 2018.1

$ZV: Cache for Windows (x86-64) 2018.1.1 (Build 312_1_18937U) Fri Apr 26 2019 17:58:36 EDT

Discussion (9)3

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Robert Cemper · Mar 17, 2023

by using {} your Jsonobj is already a %Library.DynamicObject
USER> ZWRITE Jsonobj
Jsonobj=<OBJECT REFERENCE>[1@%Library.DynamicObject]

no need for
Set Dynjsonobj=##class(%Library.DynamicObject).%FromJSON(Jsonobj)

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score 0 · Answer 1 · 2023-03-17T10:16:53-04:00

Hi Robert

I have tried by giving Set Dynjsonobj={}.%FromJSON(Jsonobj) it is throwing below error

<THROW>%FromJSON+37^%Library.DynamicAbstractObject.1 *%Exception.General READ error while reading input stream 10 Line 1 Offset 0

Is there any way i can read from the JSON object

score 0 · Answer 2 · 2023-03-17T10:30:53-04:00

if you insist on that line you need

Set Jsonobj="{""Doctype"":""ADT^A01"",""PatientId"":""123"",""PatientName"":""Alex""}"

score 0 · Answer 3 · 2023-03-17T14:08:12-04:00

Thank you Robert, It worked.

Set Jsonobj="{""Doctype"":""ADT^A01"",""PatientId"":""123"",""PatientName"":""Alex""}"

set dynmicobj={}.%FromJSON(Jsonobj)

Set HL7Obj=##Class(EnsLib.HL7.Message).%New(dynmicobj)

---> here i am trying to open an Object trying to Convert JSON to HL7 message

Can you share any ideas how can i proceed from this steps to convert into HL7 message ?

score 0 · Answer 4 · 2023-03-17T15:20:38-04:00

Robert Cemper · Mar 17, 2023

Sorry, HL7 is not my world.

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score 1 · Answer 5 · 2023-03-17T09:23:19-04:00

Hi @Joe Jones !

Take a look at the following sample app by @Guillaume Rongier - it contains FHIR to HL7 transformation example, which is in fact JSON to HL7 also.

score 0 · Answer 6 · 2023-03-17T10:17:33-04:00

Joe Jones · Mar 17, 2023

Thank you for giving the example i will look into it

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score 0 · Answer 7 · 2023-03-20T09:52:41-04:00

I created a class for the JSON message and then used a data transformation in Ensemble/IRIS to transform the JSON message to an HL7 message.

score 0 · Answer 8 · 2024-04-08T06:18:32-04:00

Krishnaveni Kapu · Apr 8, 2024

Hi , Can you share the class you created.

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