Unicode C

JSON: Miscellaneous Operations

See more JSON Examples

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

Unicode C

#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObjectW json;
    HCkJsonObjectW sampleData;

    success = FALSE;

    json = CkJsonObjectW_Create();
    CkJsonObjectW_putEmitCompact(json,FALSE);

    // Assume the file contains the data as shown above..
    success = CkJsonObjectW_LoadFile(json,L"qa_data/json/sample2.json");
    if (success == FALSE) {
        wprintf(L"%s\n",CkJsonObjectW_lastErrorText(json));
        CkJsonObjectW_Dispose(json);
        return;
    }

    // Get the "sampleData" object:
    sampleData = CkJsonObjectW_Create();
    CkJsonObjectW_ObjectOf2(json,L"sampleData",sampleData);

    // Demonstrate BoolAt and BoolOf
    wprintf(L"hungry: %d\n",CkJsonObjectW_BoolOf(sampleData,L"hungry"));
    wprintf(L"hungry: %d\n",CkJsonObjectW_BoolAt(sampleData,2));

    // StringOf returns the value as a string regardless of it's actual type:
    wprintf(L"pi: %s\n",CkJsonObjectW_stringOf(sampleData,L"pi"));
    wprintf(L"answer: %s\n",CkJsonObjectW_stringOf(sampleData,L"answer"));
    wprintf(L"withoutValue: %s\n",CkJsonObjectW_stringOf(sampleData,L"withoutValue"));
    wprintf(L"hungry: %s\n",CkJsonObjectW_stringOf(sampleData,L"hungry"));

    // Demonstrate IsNullOf / IsNullAt
    wprintf(L"withoutValue is null? %d\n",CkJsonObjectW_IsNullOf(sampleData,L"withoutValue"));
    wprintf(L"withoutValue is null? %d\n",CkJsonObjectW_IsNullAt(sampleData,3));
    wprintf(L"apple is null? %d\n",CkJsonObjectW_IsNullOf(sampleData,L"apple"));
    wprintf(L"apple is null? %d\n",CkJsonObjectW_IsNullAt(sampleData,1));

    // IntOf
    wprintf(L"answer: %d\n",CkJsonObjectW_IntOf(sampleData,L"answer"));

    // SetNullAt, SetNullOf
    // Set "pi" to null
    success = CkJsonObjectW_SetNullAt(sampleData,0);
    // Set "answer" to null
    success = CkJsonObjectW_SetNullOf(sampleData,L"answer");

    // Show the changes:
    wprintf(L"%s\n",CkJsonObjectW_emit(json));

    // Restore pi and apple:
    success = CkJsonObjectW_SetNumberAt(sampleData,0,L"3.14");
    success = CkJsonObjectW_SetNumberOf(sampleData,L"answer",L"42");

    // Show the changes:
    wprintf(L"%s\n",CkJsonObjectW_emit(json));

    // Add a null value named "afterApple" just after "apple"
    success = CkJsonObjectW_AddNullAt(sampleData,2,L"afterApple");

    // Add a boolean value just after "pi"
    success = CkJsonObjectW_AddBoolAt(sampleData,1,L"afterPi",FALSE);

    // Examine the changes..
    wprintf(L"%s\n",CkJsonObjectW_emit(json));


    CkJsonObjectW_Dispose(json);
    CkJsonObjectW_Dispose(sampleData);

    }