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
    }