now warnings appear in windows, and some other very minor changes

messages.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Mon Oct 22 11:46:00 2018
+
+@author: martindrech
+"""
+
+from PyQt5.QtWidgets import QMessageBox
+
+def show_warning(text, details_text = ''):
+   msg = QMessageBox()
+   msg.setIcon(QMessageBox.Warning)
+
+   msg.setText(text)
+
+   msg.setWindowTitle("Oh dear")
+   if details_text:
+       msg.setDetailedText(details_text)
+       
+   msg.setStandardButtons(QMessageBox.Ok)
+   msg.buttonClicked.connect(msgbtn)
+	
+   retval = msg.exec_()
+   #print("value of pressed message box button:", retval)
+   
+   
+def msgbtn(i):
+   print("Button pressed is:",i.text())
\ No newline at end of file

myWidgets.py

@@ -12,7 +12,7 @@ from PyQt5.QtCore import QTimer
 from PyQt5.QtWidgets import (QPushButton, QWidget, QVBoxLayout, QLCDNumber, QProgressBar, QLabel)
 import telnetlib
 import os
-
+from messages import show_warning
 
 #An example of a class
 class anal_control_signal(QWidget):
@@ -38,7 +38,7 @@ class anal_control_signal(QWidget):
         try:
             self.AO = daq_AO(self.ch)
         except:
-            print('Analog output %i not found. Daq might not be connected' % self.ch)
+            show_warning('Analog output %i not found. Daq might not be connected' % self.ch)
         
         
         
@@ -109,7 +109,8 @@ class anal_control_signal(QWidget):
             self.scanLabelValue.setText("%.2f" % self.scan_step + ' V')
         except ZeroDivisionError:
             self.doScanAction()
-            print('Oh dear, you might be trying to scan from 0 to 0. Plase never do that again. ')
+            #print('Oh dear, you might be trying to scan from 0 to 0. Plase never do that again. ')
+            show_warning('Oh dear, you might be trying to scan from 0 to 0. Plase never do that again.')
     
     def doScanAction(self):
         
@@ -142,9 +143,10 @@ class anal_control_signal(QWidget):
             
             
             if self.scan_step > b or self.scan_step < a:
-                print('scan can not start outside scan range and scan start should be lower than scan stop')
+                details = 'Remember remember the fifth of November.' + '\n' + 'Also remember that scan starts from the value of the corresponding spin box'
+                show_warning('Scan can not start outside scan range and scan start should be lower than scan stop', details_text= details)
             elif n < 5:
-                print('%i steps are too few, you need at least 5 steps' % (n) )
+                show_warning('%i steps are too few, you need at least 5 steps' % (n) )
                 pass
             else:
                 self.sb.setEnabled(False)
@@ -171,7 +173,7 @@ class digital_control_signal(QWidget):
         try:
             self.DO = daq_DO(self.ch)
         except:
-            print('Digital output %i not found. Daq might not be connected' % self.ch)
+            show_warning('Digital output %i not found. Daq might not be connected' % self.ch)
             
         self.cb = QtGui.QCheckBox()
         self.cb.stateChanged.connect(self.whenChangeDigital)
@@ -210,9 +212,15 @@ class burleighWM(QWidget):
             wavemeter_ok = False
             try:
                 tn = telnetlib.Telnet(host = "wannanosaurus", port = 1234, timeout = 1)
-                wavemeter_ok = True
+                
             except:
-                print('wannanosaurus not connected')
+                show_warning('Wannanosaurus not connected')
+
+            
+            if tn.sock_avail():
+                wavemeter_ok = True
+            else:
+                show_warning('Wannanosaurus seems connected but WM might be off.')
             
             if wavemeter_ok:
                 tn.write(b'++eos 1\n')