Go

Get the Root of a JSON Document

See more JSON Examples

Demonstrates 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
    }
}

Go

    success := false

    json := chilkat.NewJsonObject()

    jsonStr := "{\"flower\": \"tulip\",\"abc\":{\"x\": [{ \"a\" : 1 },{ \"b1\" : 100, \"b2\" : 200 },{ \"c\" : 3 }],\"y\": 200,\"z\": 200}}"

    success = json.Load(jsonStr)
    if success == false {
        fmt.Println(json.LastErrorText())
        json.DisposeJsonObject()
        return
    }

    // Get the "abc" object.
    abcObj := chilkat.NewJsonObject()
    success = json.ObjectOf2("abc",abcObj)
    if success == false {
        fmt.Println(json.LastErrorText())
        json.DisposeJsonObject()
        abcObj.DisposeJsonObject()
        return
    }

    // Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
    abcObj.SetEmitCompact(false)
    fmt.Println(*abcObj.Emit())

    // Navigate to the "x" array
    xArray := chilkat.NewJsonArray()
    abcObj.ArrayOf2("x",xArray)

    // Navigate to the 2nd object contained within the array.  This contains members b1 and b2
    bObj := chilkat.NewJsonObject()
    xArray.ObjectAt2(1,bObj)

    // Show that we're at "b1/b2".
    // The value of "b1" should be "200"
    fmt.Println("b2 = ", bObj.IntOf("b2"))

    // Now go back to the JSON doc root:
    docRoot := chilkat.NewJsonObject()
    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.SetEmitCompact(false)
    fmt.Println(*docRoot.Emit())

    json.DisposeJsonObject()
    abcObj.DisposeJsonObject()
    xArray.DisposeJsonArray()
    bObj.DisposeJsonObject()
    docRoot.DisposeJsonObject()