(C++) Eval JavaScript Returning Int

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Note: This example requires Chilkat v11.4.0 or greater.

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#include <CkStringBuilder.h>
#include <CkJs.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example demonstrates getting the completion value of a script,
    // where the last evaluated expression is an integer.

    // The Javascript run in this example is shown below.

    // Load the JavaScript from a file.
    CkStringBuilder sbScript;
    success = sbScript.LoadFile("js_eval_return_int.js","utf-8");
    if (success == false) {
        std::cout << sbScript.lastErrorText() << "\r\n";
        return;
    }

    CkJs js;
    CkJsonObject result;

    // Run the JavaScript
    // Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
    // In this case, the last evaluated expression is an int.
    success = js.Eval(sbScript,result);
    if (success == false) {
        std::cout << sbScript.lastErrorText() << "\r\n";
        return;
    }

    result.put_EmitCompact(false);
    std::cout << result.emit() << "\r\n";

    // Output:

    // {
    //   "type": "int",
    //   "value": 42
    // }
    }

const base = 10;
const multiplier = 4;
const offset = 2;

// The last line is a calculation resulting in an integer
// Returns 42.
(base * multiplier) + offset;