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(Ruby) Get the Root of a JSON DocumentDemonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document: { "flower": "tulip", "abc": { "x": [ { "a" : 1 }, { "b1" : 100, "b2" : 200 }, { "c" : 3 } ], "y": 200, "z": 200 } } Note: This example requires Chilkat v11.0.0 or greater.
require 'chilkat' success = false json = Chilkat::CkJsonObject.new() jsonStr = "{\"flower\": \"tulip\",\"abc\":{\"x\": [{ \"a\" : 1 },{ \"b1\" : 100, \"b2\" : 200 },{ \"c\" : 3 }],\"y\": 200,\"z\": 200}}" success = json.Load(jsonStr) if (success == false) print json.lastErrorText() + "\n"; exit end # Get the "abc" object. abcObj = Chilkat::CkJsonObject.new() success = json.ObjectOf2("abc",abcObj) if (success == false) print json.lastErrorText() + "\n"; exit end # Side note: The JSON of a sub-part of the document can be emitted from any JSON object: abcObj.put_EmitCompact(false) print abcObj.emit() + "\n"; # Navigate to the "x" array xArray = Chilkat::CkJsonArray.new() abcObj.ArrayOf2("x",xArray) # Navigate to the 2nd object contained within the array. This contains members b1 and b2 bObj = Chilkat::CkJsonObject.new() xArray.ObjectAt2(1,bObj) # Show that we're at "b1/b2". # The value of "b1" should be "200" print "b2 = " + bObj.IntOf("b2").to_s() + "\n"; # Now go back to the JSON doc root: docRoot = Chilkat::CkJsonObject.new() bObj.GetDocRoot2(docRoot) # We'll skip the null check and assume it's non-null... # Pretty-print the JSON doc from the root to show that this is indeed the root. docRoot.put_EmitCompact(false) print docRoot.emit() + "\n"; |
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