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(Visual FoxPro) 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.
LOCAL lnSuccess LOCAL loJson LOCAL lcJsonStr LOCAL loAbcObj LOCAL loXArray LOCAL loBObj LOCAL loDocRoot lnSuccess = 0 loJson = CreateObject('Chilkat.JsonObject') lcJsonStr = '{"flower": "tulip","abc":{"x": [{ "a" : 1 },{ "b1" : 100, "b2" : 200 },{ "c" : 3 }],"y": 200,"z": 200}}' lnSuccess = loJson.Load(lcJsonStr) IF (lnSuccess = 0) THEN ? loJson.LastErrorText RELEASE loJson CANCEL ENDIF * Get the "abc" object. loAbcObj = CreateObject('Chilkat.JsonObject') lnSuccess = loJson.ObjectOf2("abc",loAbcObj) IF (lnSuccess = 0) THEN ? loJson.LastErrorText RELEASE loJson RELEASE loAbcObj CANCEL ENDIF * Side note: The JSON of a sub-part of the document can be emitted from any JSON object: loAbcObj.EmitCompact = 0 ? loAbcObj.Emit() * Navigate to the "x" array loXArray = CreateObject('Chilkat.JsonArray') loAbcObj.ArrayOf2("x",loXArray) * Navigate to the 2nd object contained within the array. This contains members b1 and b2 loBObj = CreateObject('Chilkat.JsonObject') loXArray.ObjectAt2(1,loBObj) * Show that we're at "b1/b2". * The value of "b1" should be "200" ? "b2 = " + STR(loBObj.IntOf("b2")) * Now go back to the JSON doc root: loDocRoot = CreateObject('Chilkat.JsonObject') loBObj.GetDocRoot2(loDocRoot) * 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. loDocRoot.EmitCompact = 0 ? loDocRoot.Emit() RELEASE loJson RELEASE loAbcObj RELEASE loXArray RELEASE loBObj RELEASE loDocRoot |
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