methods to start and stop scanning
function (success, fail, args, env) {
		var result = new PluginResult(args, env);
		resultObjs[result.callbackId] = result;
		readCallback = result.callbackId;
		var views = qnx.webplatform.getWebViews();
		var handle = null;
		var group = null;
		var z = -1;
		for (var i = 0; i < views.length; i++) {
			if (views[i].visible && views[i].zOrder > z){
				z = views[i].zOrder;
				group = views[i].windowGroup;
				handle = views[i].jsScreenWindowHandle;
			}
		}
		if (handle !== null) {
			var values = { group: group, handle: handle };
			result.ok(barcodescanner.getInstance().startRead(result.callbackId, values), true);
		} else {
			result.error("Failed to find window handle", false);
		}
	}