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
}

C

#include <C_CkJsonObject.h>
#include <C_CkJsonArray.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject json;
    HCkJsonArray listA;
    BOOL bNull;
    HCkJsonObject tickerObj;
    HCkJsonArray aa;
    HCkJsonArray aFruit;
    HCkJsonObject appleObj;
    HCkJsonObject pearObj;

    success = FALSE;

    json = CkJsonObject_Create();

    // Load the JSON from a file.
    success = CkJsonObject_LoadFile(json,"qa_data/json/modifySample.json");
    if (success == FALSE) {
        printf("%s\n",CkJsonObject_lastErrorText(json));
        CkJsonObject_Dispose(json);
        return;
    }

    // This example will not check for errors (i.e. null / false / 0 return values)...

    // Get the "list" array:

    listA = CkJsonArray_Create();

    CkJsonObject_ArrayOf2(json,"list",listA);

    // Modify values in the list.

    // Change banana to plantain
    success = CkJsonArray_SetStringAt(listA,0,"plantain");

    // Change 12 to 24
    success = CkJsonArray_SetIntAt(listA,1,24);

    // Change true to false
    success = CkJsonArray_SetBoolAt(listA,2,FALSE);

    // Is the 3rd item null?
    bNull = CkJsonArray_IsNullAt(listA,3);

    // Change "orange" to 32.
    success = CkJsonArray_SetIntAt(listA,4,32);

    // Change 12.5 to 31.2
    success = CkJsonArray_SetNumberAt(listA,5,"31.2");

    // Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
    // Do this by deleting, then inserting a new object at the same location.
    success = CkJsonArray_DeleteAt(listA,6);
    tickerObj = CkJsonObject_Create();
    CkJsonArray_AddObjectAt2(listA,6,tickerObj);

    success = CkJsonObject_AppendString(tickerObj,"ticker","GOOG");

    // Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
    success = CkJsonArray_DeleteAt(listA,7);
    aa = CkJsonArray_Create();
    CkJsonArray_AddArrayAt2(listA,7,aa);

    success = CkJsonArray_AddStringAt(aa,-1,"apple");
    success = CkJsonArray_AddIntAt(aa,-1,22);
    success = CkJsonArray_AddBoolAt(aa,-1,TRUE);
    success = CkJsonArray_AddNullAt(aa,-1);
    success = CkJsonArray_AddNumberAt(aa,-1,"1080.25");

    // Get the "fruit" array
    aFruit = CkJsonArray_Create();
    CkJsonObject_ArrayAt2(json,0,aFruit);

    // Get the 1st element:
    appleObj = CkJsonObject_Create();
    CkJsonArray_ObjectAt2(aFruit,0,appleObj);

    // Modify values by member name:
    success = CkJsonObject_SetStringOf(appleObj,"fruit","fuji_apple");
    success = CkJsonObject_SetIntOf(appleObj,"count",46);
    success = CkJsonObject_SetBoolOf(appleObj,"fresh",FALSE);
    success = CkJsonObject_SetStringOf(appleObj,"extraInfo","developed by growers at the Tohoku Research Station in Fujisaki");

    // Modify values by index:

    pearObj = CkJsonObject_Create();
    CkJsonArray_ObjectAt2(aFruit,1,pearObj);

    success = CkJsonObject_SetStringAt(pearObj,0,"bartlett_pear");
    success = CkJsonObject_SetIntAt(pearObj,1,12);
    success = CkJsonObject_SetBoolAt(pearObj,2,FALSE);
    success = CkJsonObject_SetStringAt(pearObj,3,"harvested in late August to early September");

    CkJsonObject_putEmitCompact(json,FALSE);
    printf("%s\n",CkJsonObject_emit(json));


    CkJsonObject_Dispose(json);
    CkJsonArray_Dispose(listA);
    CkJsonObject_Dispose(tickerObj);
    CkJsonArray_Dispose(aa);
    CkJsonArray_Dispose(aFruit);
    CkJsonObject_Dispose(appleObj);
    CkJsonObject_Dispose(pearObj);

    }