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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 <CkJsonObjectW.h> #include <CkJsonArrayW.h> void ChilkatSample(void) { bool success = false; CkJsonObjectW json; // Load the JSON from a file. success = json.LoadFile(L"qa_data/json/modifySample.json"); if (success == false) { wprintf(L"%s\n",json.lastErrorText()); return; } // This example will not check for errors (i.e. null / false / 0 return values)... // Get the "list" array: CkJsonArrayW listA; json.ArrayOf2(L"list",listA); // Modify values in the list. // Change banana to plantain success = listA.SetStringAt(0,L"plantain"); // Change 12 to 24 success = listA.SetIntAt(1,24); // Change true to false success = listA.SetBoolAt(2,false); // Is the 3rd item null? bool bNull = listA.IsNullAt(3); // Change "orange" to 32. success = listA.SetIntAt(4,32); // Change 12.5 to 31.2 success = listA.SetNumberAt(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 = listA.DeleteAt(6); CkJsonObjectW tickerObj; listA.AddObjectAt2(6,tickerObj); success = tickerObj.AppendString(L"ticker",L"GOOG"); // Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]" success = listA.DeleteAt(7); CkJsonArrayW aa; listA.AddArrayAt2(7,aa); success = aa.AddStringAt(-1,L"apple"); success = aa.AddIntAt(-1,22); success = aa.AddBoolAt(-1,true); success = aa.AddNullAt(-1); success = aa.AddNumberAt(-1,L"1080.25"); // Get the "fruit" array CkJsonArrayW aFruit; json.ArrayAt2(0,aFruit); // Get the 1st element: CkJsonObjectW appleObj; aFruit.ObjectAt2(0,appleObj); // Modify values by member name: success = appleObj.SetStringOf(L"fruit",L"fuji_apple"); success = appleObj.SetIntOf(L"count",46); success = appleObj.SetBoolOf(L"fresh",false); success = appleObj.SetStringOf(L"extraInfo",L"developed by growers at the Tohoku Research Station in Fujisaki"); // Modify values by index: CkJsonObjectW pearObj; aFruit.ObjectAt2(1,pearObj); success = pearObj.SetStringAt(0,L"bartlett_pear"); success = pearObj.SetIntAt(1,12); success = pearObj.SetBoolAt(2,false); success = pearObj.SetStringAt(3,L"harvested in late August to early September"); json.put_EmitCompact(false); wprintf(L"%s\n",json.emit()); } |
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