Better catch errors in first run wizard.

Cura/gui/configWizard.py

@@ -174,6 +174,11 @@ class UltimakerCheckupPage(InfoPage):
 	def OnRun(self):
 		wx.CallAfter(self.AddProgressText, "Connecting to machine...")
 		self.comm = machineCom.MachineCom()
+		
+		if not self.comm.isOpen():
+			wx.CallAfter(self.AddProgressText, "Error: Failed to open serial port to machine")
+			wx.CallAfter(self.AddProgressText, "If this keeps happening, try disconnecting and reconnecting the USB cable")
+			return
 
 		wx.CallAfter(self.AddProgressText, "Checking start message...")
 		if self.DoCommCommandWithTimeout(None, 'start') == False:
@@ -288,10 +293,10 @@ class UltimakerCheckupPage(InfoPage):
 		t.start()
 		while True:
 			line = self.comm.readline()
-			if line == '':
+			if line == '' or line == None:
 				self.comm.close()
 				return False
-			print line
+			print line.rstrip()
 			if line.startswith(replyStart):
 				break
 		t.cancel()
@@ -369,6 +374,10 @@ class UltimakerCalibrateStepsPerEPage(InfoPage):
 		self.extrudeButton.Enable(False)
 		currentEValue = float(self.stepsPerEInput.GetValue())
 		self.comm = machineCom.MachineCom()
+		if not self.comm.isOpen():
+			wx.CallAfter(self.AddProgressText, "Error: Failed to open serial port to machine")
+			wx.CallAfter(self.AddProgressText, "If this keeps happening, try disconnecting and reconnecting the USB cable")
+			return
 		while True:
 			line = self.comm.readline()
 			if line == '':
@@ -392,6 +401,10 @@ class UltimakerCalibrateStepsPerEPage(InfoPage):
 	
 	def OnHeatRun(self):
 		self.comm = machineCom.MachineCom()
+		if not self.comm.isOpen():
+			wx.CallAfter(self.AddProgressText, "Error: Failed to open serial port to machine")
+			wx.CallAfter(self.AddProgressText, "If this keeps happening, try disconnecting and reconnecting the USB cable")
+			return
 		while True:
 			line = self.comm.readline()
 			if line == '':

Cura/gui/machineCom.py

@@ -153,12 +153,13 @@ class MachineCom():
 			programmer = stk500v2.Stk500v2()
 			for port in serialList():
 				try:
+					print "Connecting to: %s %i" % (port, baudrate)
 					programmer.connect(port)
 					programmer.close()
-					print "Connecting to: %s %i" % (port, baudrate)
 					self.serial = Serial(port, baudrate, timeout=2)
 					break
 				except ispBase.IspError:
+					print "Error while connecting to %s %i" % (port, baudrate)
 					pass
 				except:
 					print "Unexpected error while connecting to serial port:" + port, sys.exc_info()[0]
@@ -170,6 +171,7 @@ class MachineCom():
 				self.serial = Serial(port, baudrate, timeout=2)
 			except:
 				print "Unexpected error while connecting to serial port:" + port, sys.exc_info()[0]
+		print self.serial
 
 	def readline(self):
 		if self.serial == None:
@@ -184,6 +186,12 @@ class MachineCom():
 			self.serial.close()
 		self.serial = None
 	
+	def __del__(self):
+		self.close()
+	
+	def isOpen(self):
+		return self.serial != None
+	
 	def sendCommand(self, cmd):
 		if self.serial == None:
 			return