exportGraphics with custom convert functions

fix QPIConnection for pip2

libs/piqt/qpiconnection.h

@@ -37,7 +37,11 @@ public:
 	bool loadFromCMFile(const QString & file);
 	
 protected:
+#if PIP_VERSION >= PIP_MAKE_VERSION(2,38,0)
 	void propertyChanged(const char *) override {setObjectName(PI2QString(name()));}
+#else
+	void propertyChanged(const PIString &) override {setObjectName(PI2QString(name()));}
+#endif
 	EVENT_HANDLER2(void, piDataRec, const PIString &, from, const PIByteArray &, data);
 	EVENT_HANDLER2(void, piPacketRec, const PIString &, from, const PIByteArray &, data);