Re: Parsing json with YAJL

[B Stone <bvstone@xxxxxxxxx>]

The issue is rates isn't an array, it's a parent of a list of currencies.

rates = yajl_object_find(docNode :'rates');
thisRate = yajl_object_find(rates:'USD');

val = yajl_get_number(thisRate);

thisRate = yajl_object_find(rates:'CAD');
val = yajl_get_number(thisRate);

etc...


   Bradley V. Stone
www.bvstools.com
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On Thu, Feb 6, 2020 at 7:14 AM Greg Wilburn <
gwilburn@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

> So if you check rates, is it NULL?
>
> I know some still like to parse this way, but personally I prefer using
> DATA-INTO with YAJLINTO parser.  Basically one line of code to parse the
> entire JSON string into a DS.
> Scott even created a utility to create the DS for you.
>
> -----Original Message-----
> From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of
> Robert Rogerson
> Sent: Wednesday, February 05, 2020 9:27 PM
> To: RPG programming on the IBM i (AS/400 and iSeries) <
> rpg400-l@xxxxxxxxxxxxxxxxxx>
> Subject: Parsing json with YAJL
>
> Hi All,
>
> I'm trying to parse a simple json document using yajl.  Here is the code I
> have.
>
> dcl-proc GetCurrency ;
>     dcl-pi *n char(52);
>       pJson char(32766);
>     end-pi;
>
>     dcl-s i int(10);
>     dcl-s j int(10);
>     dcl-s docNode like(yajl_val);
>     dcl-s node like(yajl_val);
>     dcl-s val like(yajl_val);
>     dcl-s rates like(yajl_val);
>     dcl-s errMsg varChar(500);
>     dcl-s key varChar(50);
>     dcl-s retMsg like(msg);
>
>     // In debug pJson = {"success":true,
>                                      "timestamp":1580953386,
>                                      "base":"EUR",
>                                      "date": "2020-02-06",
>
>  "rates":{"USD":1.099578,"CAD":1.460943}}
>
>     docNode = yajl_string_load_tree(pJson :errMsg);
>     If errMsg <> *blanks;
>       Return *blanks;
>     Endif;
>
>     node = yajl_object_find(docNode :'base');
>     errMsg = yajl_get_string(node);
>     // In debug errMsg = 'EUR'
>
>     rates = yajl_object_find(docNode :'rates');
>
>     i = 0;
>     Dow yajl_array_loop(rates :i :node);
>     // In debug this loop is never entered so yajl_array_loop is returning
> false
>       j = 0;
>       Dow yajl_object_loop(node :j :key :val);
>         If key = 'USD';
>           retMsg = 'Rate for USD = ' + yajl_get_string(val);
>           Leave;
>         Endif;
>         If retMsg <> *blanks;
>           Leave;
>         Endif;
>       Enddo;
>     Enddo;
>
>     yajl_tree_free(docNode);
>
>     Return retMsg;
>
>   end-proc;
>
> In debug I can see that I am able to find the node 'base' but I am unable
> to find the node 'rates'.
>
> Can anyone see what I'm missing?
>
> Thanks,
>
> Rob
> --
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