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(Unicode C) Modify Parts of JSON DocumentDemonstrates how to modify parts of a JSON document. This example uses the following JSON document: { "fruit": [ { "kind": "apple", "count": 24, "fresh": true, "extraInfo": null, "listA": [ "abc", 1, null, false ], "objectB": { "animal" : "monkey" } }, { "kind": "pear", "count": 18, "fresh": false, "extraInfo": null "listA": [ "xyz", 24, null, true ], "objectB": { "animal" : "lemur" } } ], "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ], "alien" : true } 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; HCkJsonArrayW listA; BOOL bNull; HCkJsonObjectW tickerObj; HCkJsonArrayW aa; HCkJsonArrayW aFruit; HCkJsonObjectW appleObj; HCkJsonObjectW pearObj; success = FALSE; json = CkJsonObjectW_Create(); // Load the JSON from a file. success = CkJsonObjectW_LoadFile(json,L"qa_data/json/modifySample.json"); if (success == FALSE) { wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json)); CkJsonObjectW_Dispose(json); return; } // This example will not check for errors (i.e. null / false / 0 return values)... // Get the "list" array: listA = CkJsonArrayW_Create(); CkJsonObjectW_ArrayOf2(json,L"list",listA); // Modify values in the list. // Change banana to plantain success = CkJsonArrayW_SetStringAt(listA,0,L"plantain"); // Change 12 to 24 success = CkJsonArrayW_SetIntAt(listA,1,24); // Change true to false success = CkJsonArrayW_SetBoolAt(listA,2,FALSE); // Is the 3rd item null? bNull = CkJsonArrayW_IsNullAt(listA,3); // Change "orange" to 32. success = CkJsonArrayW_SetIntAt(listA,4,32); // Change 12.5 to 31.2 success = CkJsonArrayW_SetNumberAt(listA,5,L"31.2"); // Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" } // Do this by deleting, then inserting a new object at the same location. success = CkJsonArrayW_DeleteAt(listA,6); tickerObj = CkJsonObjectW_Create(); CkJsonArrayW_AddObjectAt2(listA,6,tickerObj); success = CkJsonObjectW_AppendString(tickerObj,L"ticker",L"GOOG"); // Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]" success = CkJsonArrayW_DeleteAt(listA,7); aa = CkJsonArrayW_Create(); CkJsonArrayW_AddArrayAt2(listA,7,aa); success = CkJsonArrayW_AddStringAt(aa,-1,L"apple"); success = CkJsonArrayW_AddIntAt(aa,-1,22); success = CkJsonArrayW_AddBoolAt(aa,-1,TRUE); success = CkJsonArrayW_AddNullAt(aa,-1); success = CkJsonArrayW_AddNumberAt(aa,-1,L"1080.25"); // Get the "fruit" array aFruit = CkJsonArrayW_Create(); CkJsonObjectW_ArrayAt2(json,0,aFruit); // Get the 1st element: appleObj = CkJsonObjectW_Create(); CkJsonArrayW_ObjectAt2(aFruit,0,appleObj); // Modify values by member name: success = CkJsonObjectW_SetStringOf(appleObj,L"fruit",L"fuji_apple"); success = CkJsonObjectW_SetIntOf(appleObj,L"count",46); success = CkJsonObjectW_SetBoolOf(appleObj,L"fresh",FALSE); success = CkJsonObjectW_SetStringOf(appleObj,L"extraInfo",L"developed by growers at the Tohoku Research Station in Fujisaki"); // Modify values by index: pearObj = CkJsonObjectW_Create(); CkJsonArrayW_ObjectAt2(aFruit,1,pearObj); success = CkJsonObjectW_SetStringAt(pearObj,0,L"bartlett_pear"); success = CkJsonObjectW_SetIntAt(pearObj,1,12); success = CkJsonObjectW_SetBoolAt(pearObj,2,FALSE); success = CkJsonObjectW_SetStringAt(pearObj,3,L"harvested in late August to early September"); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); CkJsonObjectW_Dispose(json); CkJsonArrayW_Dispose(listA); CkJsonObjectW_Dispose(tickerObj); CkJsonArrayW_Dispose(aa); CkJsonArrayW_Dispose(aFruit); CkJsonObjectW_Dispose(appleObj); CkJsonObjectW_Dispose(pearObj); } |
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