[V8i C++] Best way to retrieve POD files?

Currently I am checking for and storing the eeh for each pod file using mdlscancriteria..  

What if the user attaches a pod file after I have does this scan... Do I need to continously run this scan every time I want to run a process?

Is there a *_setfunction function that will notify me if a pod file was attached? That way, I could scan once, and any time a pod is attached, I can append to my array.  Any thoughts would be great!

This is what I am currently using.. I would really like something more efficient.

	POD_Files.clear();

	ScanCriteriaP scP = mdlScanCriteria_create  ();  

	mdlScanCriteria_setModel(scP, ACTIVEMODEL);
	mdlScanCriteria_setReturnType (scP, MSSCANCRIT_ITERATE_ELMREF, false, true);
	mdlScanCriteria_setElemRefCallback (scP, ScanCrit_Locate_POD_Files, NULL);
	mdlScanCriteria_addSingleElementTypeTest (scP, EXTENDED_ELM);
	mdlScanCriteria_scan (scP, NULL, NULL, NULL);


	mdlScanCriteria_free (scP);

	int ScanCrit_Locate_POD_Files (ElementRef elemRef,void* callbackArg, ScanCriteria* scP){

		ElemHandle  eh (elemRef, ACTIVEMODEL);

		PointCloudHandler* handlerP = dynamic_cast<PointCloudHandler*>(&eh.GetHandler ());
		if (NULL != handlerP)
		{
			POINTCLOUDDATA.POD_Files.push_back(eh.GetElemRef());
		}

		return SUCCESS;
	}