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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 } } Note: This example requires Chilkat v11.0.0 or greater.
#include <C_CkJsonObjectW.h> #include <C_CkJsonArrayW.h> void ChilkatSample(void) { BOOL success; HCkJsonObjectW json; const wchar_t *jsonStr; HCkJsonObjectW abcObj; HCkJsonArrayW xArray; HCkJsonObjectW bObj; HCkJsonObjectW docRoot; success = FALSE; 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 == FALSE) { wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json)); CkJsonObjectW_Dispose(json); return; } // Get the "abc" object. abcObj = CkJsonObjectW_Create(); success = CkJsonObjectW_ObjectOf2(json,L"abc",abcObj); if (success == FALSE) { wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json)); CkJsonObjectW_Dispose(json); CkJsonObjectW_Dispose(abcObj); 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 = CkJsonArrayW_Create(); CkJsonObjectW_ArrayOf2(abcObj,L"x",xArray); // Navigate to the 2nd object contained within the array. This contains members b1 and b2 bObj = CkJsonObjectW_Create(); CkJsonArrayW_ObjectAt2(xArray,1,bObj); // 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_Create(); CkJsonObjectW_GetDocRoot2(bObj,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. CkJsonObjectW_putEmitCompact(docRoot,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(docRoot)); CkJsonObjectW_Dispose(json); CkJsonObjectW_Dispose(abcObj); CkJsonArrayW_Dispose(xArray); CkJsonObjectW_Dispose(bObj); CkJsonObjectW_Dispose(docRoot); } |
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