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(Unicode C) 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 } }
#include <C_CkJsonObjectW.h> #include <C_CkJsonArrayW.h> void ChilkatSample(void) { HCkJsonObjectW json; const wchar_t *jsonStr; BOOL success; HCkJsonObjectW abcObj; HCkJsonArrayW xArray; HCkJsonObjectW bObj; HCkJsonObjectW docRoot; json = CkJsonObjectW_Create(); jsonStr = L"{\"flower\": \"tulip\",\"abc\":{\"x\": [{ \"a\" : 1 },{ \"b1\" : 100, \"b2\" : 200 },{ \"c\" : 3 }],\"y\": 200,\"z\": 200}}"; success = CkJsonObjectW_Load(json,jsonStr); if (success != TRUE) { wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json)); CkJsonObjectW_Dispose(json); return; } // Get the "abc" object. abcObj = CkJsonObjectW_ObjectOf(json,L"abc"); if (CkJsonObjectW_getLastMethodSuccess(json) == FALSE) { wprintf(L"abc object not found.\n"); CkJsonObjectW_Dispose(json); return; } // Side note: The JSON of a sub-part of the document can be emitted from any JSON object: CkJsonObjectW_putEmitCompact(abcObj,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(abcObj)); // Navigate to the "x" array xArray = CkJsonObjectW_ArrayOf(abcObj,L"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 bObj = CkJsonArrayW_ObjectAt(xArray,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" wprintf(L"b2 = %d\n",CkJsonObjectW_IntOf(bObj,L"b2")); // Now go back to the JSON doc root: docRoot = CkJsonObjectW_GetDocRoot(bObj); // 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. CkJsonObjectW_putEmitCompact(docRoot,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(docRoot)); CkJsonObjectW_Dispose(docRoot); CkJsonObjectW_Dispose(bObj); CkJsonArrayW_Dispose(xArray); CkJsonObjectW_Dispose(abcObj); CkJsonObjectW_Dispose(json); } |
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