Create log_in.py

log_in.py

+#!/usr/bin/env python3
+
+import PySimpleGUI as sg
+import time
+import os
+
+log_file_name = '/home/msm-class/attendance_log.csv'
+
+
+#ensure the expected header lines are there:
+if not os.path.isfile(log_file_name):
+    with open(log_file_name,'wt') as f:
+        f.write('mifare_id,datetime\n')
+
+# Jankily check the header
+with open(log_file_name,'rt') as f:
+    lines = f.readlines()
+
+if len(lines) >= 1:
+    line = lines[0].strip()
+else:
+    line = ''
+
+# add the header if it is not there
+if line != 'mifare_id,datetime':
+    lines = ['mifare_id,datetime\n'] + lines
+    with open(log_file_name,'wt') as f:
+        f.writelines(lines)
+
+#set up the GUI
+
+# Define the window's contents
+layout = [[sg.Image('MaterialscienceCOL.png',
+                    background_color='white')],
+          #[sg.Text("Swipe your card to record attendance:",
+          #         text_color='black',
+          #         background_color='white')],
+          [sg.Input(key='-INPUT-', do_not_clear=False,visible=True)],
+          [sg.Text('Ready', size=(40,1),
+                   key='-TIME-',
+                   text_color='blue',
+                   background_color='white')],
+          [sg.Text("Swipe below",
+                   font=('bold', 20),
+                   text_color='black',
+                   background_color='white')],
+          [sg.Image('down_arrow.png',
+                    background_color='white')],
+          [sg.Button(bind_return_key=True,
+                     visible=False)]
+          ]
+
+
+width, height = sg.Window.get_screen_size()
+
+# Create the window
+window = sg.Window('Materials Science Swipe In',
+                   layout,
+                   margins=(10,10),
+                   #disable_minimize=True,
+                   #disable_close=False,
+                   text_justification='center',
+                   #keep_on_top=True,
+                   #modal=True,
+                   element_justification='center',
+                   finalize=True,
+                   background_color='white',
+                   size=(800,480))
+window.maximize()
+
+n = 0
+colours = ['red','darkorange','yellow4','green','blue','indigo']
+# start a counter and a series of colours to rotate around to make it clearer that the
+# confirmation message has changed
+
+# Display and interact with the Window using an Event Loop
+while True:
+    
+    event, values = window.read()
+    n += 1
+    
+    # determine the input ID:
+    identity = values['-INPUT-']
+    
+    # briefly clear the confirmation text to provide 
+    # more affirmative feedback
+    window['-TIME-'].update('   ')
+    window.refresh()
+    time.sleep(0.1)
+    
+    # See if user wants to quit or window was closed
+    if event == sg.WINDOW_CLOSED or event == 'Quit' or values['-INPUT-'] == 'quit':
+        break
+    
+    # Output a message confirming the time of recording to the window
+    
+    window['-TIME-'].update('Attendance recorded: ' + time.ctime(),
+                            text_color=colours[n % 6])
+    
+     # record the ID and the time to a file   
+     with open(log_file_name,'at') as f:
+        f.write(identity + ',' + time.ctime() + '\n')
+
+# Finish up by removing from the screen
+window.close()