Passing parameters from plugin to script

I need to pass some parameters from a plugin to a script. I have tried this method:

    PMString engineName("myengine");
    PMString scriptString("C:/Program Files/Adobe/Adobe InDesign CS4 Debug/Scripts/IterateFolder.jsx");
    IDFile scriptFile;
    scriptFile.SetString(scriptString);

    PMString value("c:/windows");
    ScriptData param1;
    param1.SetPMString(valor);

    ScriptIDValuePair argument1(0, param1);
       
    ScriptRecordData arguments;
    arguments.push_back(argument1);
    ScriptData result;
    PMString errorString;
    ScriptData scriptFileData(scriptFile);
    int32 errorCode=Utils<IExtendScriptUtils>()->RunScriptInEngine( engineName, scriptFileData, arguments, result, errorString);

The problem is that I don´t really kwno how can I get the parameters in my script. I suppose it must be something like app.scriptArgs.getValue(), but i don´t really know. Could anybody help me?

Thanks,

Alvaro