Unicode C++

Call a JavaScript Function Returning an Object

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

#include <CkStringBuilderW.h>
#include <CkJsW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This is the JavaScript function we'll call:

    // function getSettings() {
    //     return {
    //         theme: "dark",
    //         notifications: true,
    //         version: 1.0
    //     };
    // }

    CkStringBuilderW sbScript;
    sbScript.Append(L"function getSettings() {");
    sbScript.Append(L"    return {");
    sbScript.Append(L"        theme: \"dark\",");
    sbScript.Append(L"        notifications: true,");
    sbScript.Append(L"        version: 1.0");
    sbScript.Append(L"    };");
    sbScript.Append(L"}");

    CkJsW js;

    CkJsonObjectW 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.
        wprintf(L"%s\n",result.emit());

        // Also examine the LastErrorText.
        wprintf(L"%s\n",js.lastErrorText());
        return;
    }

    // ------------------------------------------------------------------------------
    // Call the function getSettings()

    CkJsonObjectW funcCall;

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

    // {
    //   "name": "getSettings",
    // }

    funcCall.UpdateString(L"name",L"getSettings");

    success = js.CallFunction(funcCall,result);
    if (success == false) {
        // Examine the result for an exception.
        wprintf(L"%s\n",result.emit());

        // Also examine the LastErrorText.
        wprintf(L"%s\n",js.lastErrorText());
        return;
    }

    wprintf(L"%s\n",result.emit());

    // Output:
    // {
    //   "type": "object",
    //   "value": {
    //     "theme": "dark",
    //     "notifications": true,
    //     "version": 1
    //   }
    // }

    // Examine the object's members
    wprintf(L"theme: %s\n",result.stringOf(L"value.theme"));
    wprintf(L"notifications: %d\n",result.BoolOf(L"value.notifications"));
    wprintf(L"version: %d\n",result.IntOf(L"value.version"));

    // Output:
    // theme: dark
    // notifications: True
    // version: 1
    }