C++

JavaScript console

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Demonstrates console output using Chilkat JavaScript. C++

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

void ChilkatSample(void)
    {
    bool success = false;

    // This example demonstrates using the built-in console object.
    // The Javascript run in this example is shown below.

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

    CkJs js;
    CkJsonObject result;

    // Run the JavaScript
    // Results (not console output) go to result.
    // Note: 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 console.log which does not calculate a value. Therefore, it returns undefined.
    success = js.Eval(sbScript,result);
    if (success == false) {
        std::cout << sbScript.lastErrorText() << "\r\n";
        return;
    }

    // We can look at the result, which is "undefined", which is normal and expected.
    std::cout << result.emit() << "\r\n";
    // The result JSON is: {"type":"undefined","value":"undefined"}

    // The console output is retrieved by calling ConsoleOutputSb
    CkStringBuilder sbOut;
    js.ConsoleOutputSb(sbOut);
    std::cout << sbOut.getAsString() << "\r\n";
    }