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(Perl) Modify Parts of JSON Document

Demonstrates how to modify parts of a JSON document. This example uses the following JSON document:

{
   "fruit": [
      	{
         "kind": "apple",
	 "count": 24,
	 "fresh": true,
	 "extraInfo": null,
	 "listA": [ "abc", 1, null, false ],
	 "objectB": { "animal" : "monkey" }
      	},
	{
         "kind": "pear",
	 "count": 18,
	 "fresh": false,
	 "extraInfo": null
	 "listA": [ "xyz", 24, null, true ],
	 "objectB": { "animal" : "lemur" }
	}
    ],
    "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ],
    "alien" : true
}

Chilkat Perl Downloads

Perl Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

use chilkat();

$json = chilkat::CkJsonObject->new();

#  Load the JSON from a file.
$success = $json->LoadFile("qa_data/json/modifySample.json");
if ($success != 1) {
    print $json->lastErrorText() . "\r\n";
    exit;
}

#  This example will not check for errors (i.e. null / false / 0 return values)...

#  Get the "list" array:
# listA is a JsonArray
$listA = $json->ArrayOf("list");

#  Modify values in the list.

#  Change banana to plantain
$success = $listA->SetStringAt(0,"plantain");

#  Change 12 to 24
$success = $listA->SetIntAt(1,24);

#  Change true to false
$success = $listA->SetBoolAt(2,0);

#  Is the 3rd item null?
$bNull = $listA->IsNullAt(3);

#  Change "orange" to 32.
$success = $listA->SetIntAt(4,32);

#  Change 12.5 to 31.2
$success = $listA->SetNumberAt(5,"31.2");

#  Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
#  Do this by deleting, then inserting a new object at the same location.
$success = $listA->DeleteAt(6);
$success = $listA->AddObjectAt(6);
# tickerObj is a JsonObject
$tickerObj = $listA->ObjectAt(6);
$success = $tickerObj->AddStringAt(-1,"ticker","GOOG");

#  Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
$success = $listA->DeleteAt(7);
$success = $listA->AddArrayAt(7);
# aa is a JsonArray
$aa = $listA->ArrayAt(7);
$success = $aa->AddStringAt(-1,"apple");
$success = $aa->AddIntAt(-1,22);
$success = $aa->AddBoolAt(-1,1);
$success = $aa->AddNullAt(-1);
$success = $aa->AddNumberAt(-1,"1080.25");

#  Get the "fruit" array
# aFruit is a JsonArray
$aFruit = $json->ArrayAt(0);

#  Get the 1st element:
# appleObj is a JsonObject
$appleObj = $aFruit->ObjectAt(0);

#  Modify values by member name:
$success = $appleObj->SetStringOf("fruit","fuji_apple");
$success = $appleObj->SetIntOf("count",46);
$success = $appleObj->SetBoolOf("fresh",0);
$success = $appleObj->SetStringOf("extraInfo","developed by growers at the Tohoku Research Station in Fujisaki");

#  Modify values by index:
# pearObj is a JsonObject
$pearObj = $aFruit->ObjectAt(1);
$success = $pearObj->SetStringAt(0,"bartlett_pear");
$success = $pearObj->SetIntAt(1,12);
$success = $pearObj->SetBoolAt(2,0);
$success = $pearObj->SetStringAt(3,"harvested in late August to early September");

$json->put_EmitCompact(0);
print $json->emit() . "\r\n";

 

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