(C) Eval JavaScript Returning Int

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

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#include <C_CkStringBuilder.h>
#include <C_CkJs.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilder sbScript;
    HCkJs js;
    HCkJsonObject result;

    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.
    sbScript = CkStringBuilder_Create();
    success = CkStringBuilder_LoadFile(sbScript,"js_eval_return_int.js","utf-8");
    if (success == FALSE) {
        printf("%s\n",CkStringBuilder_lastErrorText(sbScript));
        CkStringBuilder_Dispose(sbScript);
        return;
    }

    js = CkJs_Create();
    result = CkJsonObject_Create();

    // 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 = CkJs_Eval(js,sbScript,result);
    if (success == FALSE) {
        printf("%s\n",CkStringBuilder_lastErrorText(sbScript));
        CkStringBuilder_Dispose(sbScript);
        CkJs_Dispose(js);
        CkJsonObject_Dispose(result);
        return;
    }

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

    // Output:

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


    CkStringBuilder_Dispose(sbScript);
    CkJs_Dispose(js);
    CkJsonObject_Dispose(result);

    }

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

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