C++

Call a JavaScript Function Returning an Array

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Demonstrates how to call a JavaScript function that returns an array. C++

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

void ChilkatSample(void)
    {
    bool success = false;

    // ----------------------------------------------------------------------------------
    // The Javascript functions called in this example are shown at the bottom of this page.
    // -----------------------------------------------------------------------------------

    CkStringBuilder sbScript;
    success = sbScript.LoadFile("js_function_returning_array.js","utf-8");
    if (success == false) {
        std::cout << sbScript.lastErrorText() << "\r\n";
        return;
    }

    CkJs js;

    CkJsonObject result;
    result.put_EmitCompact(false);

    // Call Eval to add the function to the context's global object
    success = js.Eval(sbScript,result);
    if (success == false) {
        // Examine the result for an exception.
        std::cout << result.emit() << "\r\n";

        // Also examine the LastErrorText.
        std::cout << js.lastErrorText() << "\r\n";
        return;
    }

    // ------------------------------------------------------------------------------
    // Call each function

    CkJsonObject funcCall;

    // Create JSON specifying the function name and arguments
    // The function has no arguments, so we only specify the name.

    funcCall.UpdateString("name","getDays");

    success = js.CallFunction(funcCall,result);
    if (success == false) {
        // Examine the result for an exception.
        std::cout << result.emit() << "\r\n";

        // Also examine the LastErrorText.
        std::cout << js.lastErrorText() << "\r\n";
        return;
    }

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

    // Output:
    // {
    //   "type": "array",
    //   "value": [
    //     "Monday",
    //     "Tuesday",
    //     "Wednesday",
    //     "Thursday",
    //     "Friday"
    //   ]
    // }

    // Access each array value..
    int count = result.SizeOfArray("value");
    int i = 0;
    while (i < count) {
        result.put_I(i);
        std::cout << result.stringOf("value[i]") << "\r\n";
        i = i + 1;
    }

    // ------------------------------------------------------------------------------
    // Call the getRange(start,end) function

    funcCall.Clear();
    funcCall.UpdateString("name","getRange");
    funcCall.UpdateInt("args[0]",14);
    funcCall.UpdateInt("args[1]",21);
    success = js.CallFunction(funcCall,result);
    std::cout << result.emit() << "\r\n";

    // Output:
    // {
    //   "type": "array",
    //   "value": [
    //     14,
    //     15,
    //     16,
    //     17,
    //     18,
    //     19,
    //     20,
    //     21
    //   ]
    // }

    count = result.SizeOfArray("value");
    i = 0;
    while (i < count) {
        result.put_I(i);
        std::cout << result.IntOf("value[i]") << "\r\n";
        i = i + 1;
    }

    // ------------------------------------------------------------------------------
    // Call the getEmployees() function

    funcCall.Clear();
    funcCall.UpdateString("name","getEmployees");
    success = js.CallFunction(funcCall,result);
    std::cout << result.emit() << "\r\n";

    // Output:
    // {
    //   "type": "array",
    //   "value": [
    //     {
    //       "id": 101,
    //       "name": "Alice",
    //       "role": "Dev"
    //     },
    //     {
    //       "id": 102,
    //       "name": "Bob",
    //       "role": "Manager"
    //     }
    //   ]
    // }

    count = result.SizeOfArray("value");
    i = 0;
    while (i < count) {
        result.put_I(i);
        std::cout << "name: " << result.stringOf("value[i].name") << "\r\n";
        std::cout << "role: " << result.stringOf("value[i].role") << "\r\n";
        std::cout << "id: " << result.IntOf("value[i].id") << "\r\n";
        std::cout << "" << "\r\n";
        i = i + 1;
    }
    }