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
          
	}
}

C++

#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkJsonObject json;
    json.put_EmitCompact(false);

    // Assume the file contains the data as shown above..
    success = json.LoadFile("qa_data/json/sample2.json");
    if (success == false) {
        std::cout << json.lastErrorText() << "\r\n";
        return;
    }

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

    // Demonstrate BoolAt and BoolOf
    std::cout << "hungry: " << sampleData.BoolOf("hungry") << "\r\n";
    std::cout << "hungry: " << sampleData.BoolAt(2) << "\r\n";

    // StringOf returns the value as a string regardless of it's actual type:
    std::cout << "pi: " << sampleData.stringOf("pi") << "\r\n";
    std::cout << "answer: " << sampleData.stringOf("answer") << "\r\n";
    std::cout << "withoutValue: " << sampleData.stringOf("withoutValue") << "\r\n";
    std::cout << "hungry: " << sampleData.stringOf("hungry") << "\r\n";

    // Demonstrate IsNullOf / IsNullAt
    std::cout << "withoutValue is null? " << sampleData.IsNullOf("withoutValue") << "\r\n";
    std::cout << "withoutValue is null? " << sampleData.IsNullAt(3) << "\r\n";
    std::cout << "apple is null? " << sampleData.IsNullOf("apple") << "\r\n";
    std::cout << "apple is null? " << sampleData.IsNullAt(1) << "\r\n";

    // IntOf
    std::cout << "answer: " << sampleData.IntOf("answer") << "\r\n";

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

    // Show the changes:
    std::cout << json.emit() << "\r\n";

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

    // Show the changes:
    std::cout << json.emit() << "\r\n";

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

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

    // Examine the changes..
    std::cout << json.emit() << "\r\n";
    }