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Resolved Loadstring method on JSONpackage with multi-element JSON array
  1. How-to
  2.  JSON
0 Votes
  1. Matt Balent
  2. PowerBuilder
  3. Friday, 21 October 2022 05:37 PM UTC

So I have a JSON string I'd like to load into a JSONpackage object for further processing.  Problem is (apparently) it is an array which I guess the JSONPackage object cannot handle.  I get this error: Failed to load the JSON data because its root node is not an object

So, how do I process the file?  I assume some kind of loop through the JSON?

Code I tried:

ls_mess = ljs_pack1.loadstring(ls_pack_json) //Gives the "Failed to load the JSON data..." if the JSON is an array.
ls_jpk_json = ljs_pack1.GetValue("_patientCaseLimited") //If ls_pack_json is not an array this works since it is successfully loaded.

Link to JSON file: 

https://www.dropbox.com/s/u54ic1jb1pdgl4o/sample.json?dl=0

 Thank you

UPDATE with Solution

Here is what I ended up with to solve my particular problem.

The data is an array which has a second array (called '_patientCaseLimited') and it is this piece I need.

//ljs_pack is a JSONPackage object

//ljs_parser is a JSONParser object

ls_pack_json = ljs_pack.GetValue("Data") // gets the JSON data

ls_message = ljs_parser.loadstring(ls_pack_json)

ll_arrayitem = ljs_parser.getrootitem() // start at the root

ll_childcount = ljs_parser.getchildcount(ll_arrayitem) // how many child elements?

FOR ll_i = 1 to ll_childcount

     ll_objectitem = ljs_parser.getchilditem(ll_arrayitem, ll_i) //next child array element

     ls_casejson += ljs_parser.getitemarrayjsonstring(ll_objectitem, "_patientCaseLimited") //append arrays

NEXT

ls_jpk_json = lnv_string.of_globalreplace(ls_casejson, '][', ',') //PFC String Service

 

Now I can import the ls_jpk_json into a datawindow

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