diff --git a/libs/piqt/qpiconnection.h b/libs/piqt/qpiconnection.h
index c815128..ba49b09 100644
--- a/libs/piqt/qpiconnection.h
+++ b/libs/piqt/qpiconnection.h
@@ -37,7 +37,7 @@ public:
 	bool loadFromCMFile(const QString & file);
 	
 protected:
-	void propertyChanged(const PIString & ) {setObjectName(PI2QString(name()));}
+	void propertyChanged(const char *) {setObjectName(PI2QString(name()));}
 	EVENT_HANDLER2(void, piDataRec, const PIString &, from, const PIByteArray &, data);
 	EVENT_HANDLER2(void, piPacketRec, const PIString &, from, const PIByteArray &, data);
 	
diff --git a/libs/piqt_widgets/piqt_iodevice_edit_dialog.cpp b/libs/piqt_widgets/piqt_iodevice_edit_dialog.cpp
index f7d3e4c..e3b9b83 100644
--- a/libs/piqt_widgets/piqt_iodevice_edit_dialog.cpp
+++ b/libs/piqt_widgets/piqt_iodevice_edit_dialog.cpp
@@ -59,14 +59,11 @@ void IODeviceEditDialog::setOptions(int o) {
 
 void IODeviceEditDialog::on_comboType_currentIndexChanged(int index) {
 	PIString prefix = Q2PIString(ui->comboType->currentText());
-	PIVector<const PIObject * > rd(PICollection::groupElements("__PIIODevices__"));
-	piForeachC (PIObject * d, rd) {
-		const PIIODevice * dev = ((const PIIODevice * )d);
-		if (prefix != dev->fullPathPrefix())
-			continue;
-		ps = PI2QPropertyStorage(dev->constructVariant().get());
+	auto * d = PIIODevice::createFromFullPath(prefix + "://");
+	if (d) {
+		ps = PI2QPropertyStorage(d->constructVariant().get());
 		ui->widgetProperties->setStorage(&ps);
-		return;
+		delete d;
 	}
 }