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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 } }
LOCAL loJson LOCAL lcJsonStr LOCAL lnSuccess LOCAL loAbcObj LOCAL loXArray LOCAL loBObj LOCAL loDocRoot * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject') 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 <> 1) THEN ? loJson.LastErrorText RELEASE loJson CANCEL ENDIF * Get the "abc" object. loAbcObj = loJson.ObjectOf("abc") IF (loJson.LastMethodSuccess = 0) THEN ? "abc object not found." RELEASE loJson 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 = loAbcObj.ArrayOf("x") * We'll skip the null check and assume it's non-null... * Navigate to the 2nd object contained within the array. This contains members b1 and b2 loBObj = loXArray.ObjectAt(1) * We'll skip the null check and assume it's non-null... * 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 = loBObj.GetDocRoot() * 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 loDocRoot RELEASE loBObj RELEASE loXArray RELEASE loAbcObj RELEASE loJson |
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