Tcl

JSON: Nested Objects

See more JSON Examples

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Tcl

load ./chilkat.dll

set success 0

set json [new_CkJsonObject]

# This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
# The presence of whitespace chars for pretty-printing makes no difference to the Load
# method. 
set jsonStr "{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}"

set success [CkJsonObject_Load $json $jsonStr]
if {$success == 0} then {
    puts [CkJsonObject_lastErrorText $json]
    delete_CkJsonObject $json
    exit
}

# Get the "image" object.
set imageObj [new_CkJsonObject]

CkJsonObject_ObjectOf2 $json "image" $imageObj

puts "image: fname=[CkJsonObject_stringOf $imageObj fname], width=[CkJsonObject_IntOf $imageObj w], height=[CkJsonObject_IntOf $imageObj h]"

# Get the "thumbnail" object.
set thumbObj [new_CkJsonObject]

CkJsonObject_ObjectOf2 $json "thumbnail" $thumbObj

puts "thumbnail: fname=[CkJsonObject_stringOf $thumbObj fname], width=[CkJsonObject_IntOf $thumbObj w], height=[CkJsonObject_IntOf $thumbObj h]"

delete_CkJsonObject $json
delete_CkJsonObject $imageObj
delete_CkJsonObject $thumbObj