Re: Parsing json with YAJL

@Greg, thanks for the suggestion of DATA-INTO. I'll investigate this.

@Brad, thanks for the solution. I'll try your solution to correct the
issue but as Greg suggested I'll also look into the DATA-INTO (and
YAJLINTO).
Btw, thanks for your examples at FieldExit.com, I used your examples as
guidelines.

Rob

On Thu, Feb 6, 2020 at 8:37 AM B Stone <bvstone@xxxxxxxxx> wrote:

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
MAILTOOL Benefit #14 <https://www.bvstools.com/mailtool.html>: The

ability

to use Configuration Files at the system, User, or individual email

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This means that should any of the settings (such as your password) is
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used.

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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