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 <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkJsonObjectW json;
    json.put_EmitCompact(false);

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

    // Get the "sampleData" object:
    CkJsonObjectW sampleData;
    json.ObjectOf2(L"sampleData",sampleData);

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

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

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

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

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

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

    // Restore pi and apple:
    success = sampleData.SetNumberAt(0,L"3.14");
    success = sampleData.SetNumberOf(L"answer",L"42");

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

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

    // Add a boolean value just after "pi"
    success = sampleData.AddBoolAt(1,L"afterPi",false);

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