Unicode C

Modify Parts of JSON Document

See more JSON Examples

Demonstrates 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
}

Unicode C

#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);

    }