def changeLine():
# place the first line to the last line in config.txt in u-disk
# Call this method after calling method doStaConfig and before calling method doApConfig
text = []
with open(path.join(get_U_path(), 'config.txt')) as f:
for i, each_line in zip(range(9), f):
if i == 0:
first_line = each_line
else:
text.append(each_line)
text.append(first_line)
with open(path.join(get_U_path(), 'config.txt'), 'w') as f:
f.writelines(text)
def setMark_inUSB():
# get text of configured.txt in U-disk and get number of round
try: # judge if the file "configured.txt" already exists in U-disk
with open(path.join(get_U_path(), 'configured.txt'), 'r') as f:
# file exist
firstLine = f.readline() # type: str
endIndex = firstLine.index('.')
roundOfUSB = int(firstLine[:endIndex])
except FileNotFoundError:
# File is not found.
with open(path.join(get_U_path(), 'configured.txt'), 'w+') as s:
s.write('0.round configuration')
roundOfUSB = 0
# increase the number of round
with open(path.join(get_U_path(), 'configured.txt'), 'w+') as f:
firstLine = str(roundOfUSB + 1) + '.round configuration'
f.write(firstLine)
def setMark_inSlave():
# change the first line "At x.round configured" to "At x+1.round configured" in configuredOfPi.txt in slave_RPi
with open(path.join(get_U_path(), 'configured.txt'), 'r') as s:
# get text of configured.txt in U-disk and get number of round
firstLine = s.readline() # type: str
endIndex = firstLine.index('.')
roundOfUSB = firstLine[:endIndex]
local_path = path.split(path.realpath(__file__))[0]
with open(path.join(local_path, 'configuredOfPi.txt'), 'w+') as f:
# change the first line "At x.round configured" to "At x+1.round configured" in configuredOfPi.txt
firstLine = 'At ' + roundOfUSB + '.round configured'
f.write(firstLine)
def isConfigured():
# Used to determine if the network of slave_RPi has been configured.
# The configuredOfPi.txt file in the local path stores how many times the Raspberry Pi has been configured,
# and the configured.txt file in the U disk stores the information about which round Raspberry Pi needs to be configured.
# The difference between the two information will trigger the new network configuration of slave_RPi,
# and after being configured, the configuration information in the configuredOfPi.txt file of the Raspberry Pi
# will be synchronized with the configuration information in the configured.txt file of the U disk.
local_path = path.split(path.realpath(__file__))[0]
try:
with open(path.join(local_path, 'configuredOfPi.txt'), 'r') as f:
# get text of configuredOfPi.txt in Pi and get number of round
firstLine = f.readline() # type: str
startIndex = search('At ', firstLine).end()
endIndex = firstLine.index('.')
roundOfPi = int(firstLine[startIndex:endIndex])
except FileNotFoundError:
# Raspberry Pi has not been configured yet.
with open(path.join(local_path, 'configuredOfPi.txt'), 'w+') as s:
s.write('At 0.round configured')
roundOfPi = 0
try:
with open(path.join(get_U_path(), 'configured.txt'), 'r') as s:
# get text of configured.txt in U-disk and get number of round
firstLine = s.readline() # type: str
endIndex = firstLine.index('.')
roundOfUSB = int(firstLine[:endIndex])
except FileNotFoundError: # new U-disk without any configuration-file
return True # nothing happen and run main program of slave
except PermissionError:
system('sudo rmdir ' + get_U_path())
system('sudo reboot')
# Determine whether the configuration information of the Raspberry Pi is synchronized with the configuration information in the u disk.
if roundOfPi == roundOfUSB:
return True
else:
return False
def checkUSBatBegin(self):
# Check if usb is connected. When the USB flash drive is not connected, a warning message box will pop up.
# It is called at the beginning to prompt the user to insert a USB flash drive.
if get_U_path() == None: # No U disk is connected.
# The warning message box has an "Ok" button by default, which is selected by default.
self.msgBox.setText(
'Opening GUI for the network configration......\nU-Disk not found, please insert a readable U-Disk first.\nYou can also cancel the network configuration by clicking the cancel button or closing this message box.'
)
self.msgBox.setStandardButtons(QMessageBox.Ok | QMessageBox.Cancel)
self.msgBox.setDefaultButton(QMessageBox.Ok)
self.msgBox.setIcon(QMessageBox.Warning)
self.msgBox.setWindowTitle('Warning')
clicked = self.msgBox.exec_()
# The message box will close automatically when the "Cancel" button is pressed.
# The graphical interface for network configuration no longer appears. A graphical interface for presenting data will appear.
if clicked == QMessageBox.Cancel:
self.do_config = False
else:
# The message box will also close automatically when the "Ok" button is pressed.
# After the message box is closed, it will detect whether the USB disk is inserted again.
# If not, the warning message box still pops up.
if get_U_path() == None:
self.checkUSBatBegin()
def usbPulledOut(self):
# Function that will be triggered when a USB disk is pulled out
self.msgBox.setText(
'U-Disk was pulled out, please insert your U-Disk.')
self.msgBox.setStandardButtons(QMessageBox.Ok)
self.msgBox.setDefaultButton(QMessageBox.Ok)
self.msgBox.setIcon(QMessageBox.Warning)
self.msgBox.setWindowTitle('Warning')
# Pop up message dialog, return button being pressed. This is a blocking function.
clicked = self.msgBox.exec_()
if clicked == QMessageBox.Ok:
# The message dialog only has the ok button. After being pressed, it is judged whether the USB disk is inserted.
# If the u disk is not inserted, the message dialog box will pop up.
if get_U_path() == None:
self.usbPulledOut()
def saveConfig(self, sender):
# get the path of U-disk. For example: /media/pi/KINSTON
usbPath = get_U_path()
# Save the local config.txt file to the U disk
configFilePath = path.join(
usbPath, 'config.txt'
) # the path plus filename. For example: /media/pi/KINSTON/config.txt
assert isinstance(configFilePath, object)
if sender == self.configuration_window.Ok:
# The sender of the signal is the ok button, i.e. the ok button is pressed.
# Copy the local config.txt file into the USB flash drive
copyfile(path.join(self.local_path, 'config.txt'), configFilePath)
else: # sender == self.configuration_window.Cancel
# The sender of the signal is the cancel button, i.e. the cancel button is pressed.
# Save the local standardConfig.txt file to the USB flash drive.
copyfile(path.join(self.local_path, 'standardConfig.txt'),
configFilePath)
def getSSIDandPASS():
# patch infos from the first line of config.txt in u-disk
with open(path.join(get_U_path(), 'config.txt')) as f:
for each_line in f:
firstLine = each_line
break
endIndex = search(':', firstLine).start()
RPi = firstLine[:endIndex]
startIndex = search('SSID:', firstLine).end()
endIndex = search('Password', firstLine).start()
SSID = firstLine[startIndex:endIndex].rstrip()
startIndex = search('Password:', firstLine).end()
Password = firstLine[startIndex:].rstrip()
return [RPi, SSID, Password]
# If the NO button is pressed, a graphic window pops up showing the pressure sensor and temperature sensor data from slave_RPi.
else:
try:
displayMain(app, local_path)
except Exception as error:
recurseDisplayMain(error)
else: # detectDisplay() == 'No Display'
# execute the program for slave RPi
# check if this slave RPi was already configured.
# If not, change the internal configuration file to make the slave RPi connect with the access point of the specific RPi
# and create a access point of itself.
# !!!important: if man want to do configuration, he must put the U-disk into RPi before he boot the RPi.
sleep(3) # wait for mounting the u-disk
if get_U_path(
) != None: # judge if a USB-Stick for network configuration is connected
print(111)
# judge if the Raspberry Pi network has been configured
if isConfigured(
) == False: # If the Raspberry Pi network has not been configured yet
configAndMark4slaveRPi()
# After the configuration is complete,
# the system automatically restarts to make the new network configuration take effect.
system('sudo reboot')
# If no U disk is connected or RPi is already configured,
# execute the program for getting sensor data from itself and the slave_RPi connected with its access point
# and sending all collected sensor data to the RPi it connect with.
try: # Prevent the Raspberry Pi from causing program errors because the network has never been configured
with open(path.join(local_path, 'wpa_supplicant-wlan0.conf'),