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Tcl Examples

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(Tcl) JSON: Miscellaneous Operations

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

set json [new_CkJsonObject]

CkJsonObject_put_EmitCompact $json 0

#  Assume the file contains the data as shown above..
set success [CkJsonObject_LoadFile $json "qa_data/json/sample2.json"]
if {[expr $success != 1]} then {
    puts [CkJsonObject_lastErrorText $json]
    delete_CkJsonObject $json
    exit
}

#  First navigate to the "sampleData" object:
# sampleData is a CkJsonObject
set sampleData [CkJsonObject_ObjectOf $json "sampleData"]

#  Demonstrate BoolAt and BoolOf
puts "hungry: [CkJsonObject_BoolOf $sampleData hungry]"
puts "hungry: [CkJsonObject_BoolAt $sampleData 2]"

#  StringOf returns the value as a string regardless of it's actual type:
puts "pi: [CkJsonObject_stringOf $sampleData pi]"
puts "answer: [CkJsonObject_stringOf $sampleData answer]"
puts "withoutValue: [CkJsonObject_stringOf $sampleData withoutValue]"
puts "hungry: [CkJsonObject_stringOf $sampleData hungry]"

#  Demonstrate IsNullOf / IsNullAt
puts "withoutValue is null? [CkJsonObject_IsNullOf $sampleData withoutValue]"
puts "withoutValue is null? [CkJsonObject_IsNullAt $sampleData 3]"
puts "apple is null? [CkJsonObject_IsNullOf $sampleData apple]"
puts "apple is null? [CkJsonObject_IsNullAt $sampleData 1]"

#  IntOf
puts "answer: [CkJsonObject_IntOf $sampleData answer]"

#  SetNullAt, SetNullOf
#  Set "pi" to null
set success [CkJsonObject_SetNullAt $sampleData 0]
#  Set "answer" to null
set success [CkJsonObject_SetNullOf $sampleData "answer"]

#  Show the changes:
puts [CkJsonObject_emit $json]

#  Restore pi and apple:
set success [CkJsonObject_SetNumberAt $sampleData 0 "3.14"]
set success [CkJsonObject_SetNumberOf $sampleData "answer" "42"]

#  Show the changes:
puts [CkJsonObject_emit $json]

#  Add a null value named "afterApple" just after "apple"
set success [CkJsonObject_AddNullAt $sampleData 2 "afterApple"]

#  Add a boolean value just after "pi"
set success [CkJsonObject_AddBoolAt $sampleData 1 "afterPi" 0]

delete_CkJsonObject $sampleData

#  Examine the changes..
puts [CkJsonObject_emit $json]

delete_CkJsonObject $json

 

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