TypeError of IP address #61

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1. KennethNielsen

   self-assigned this

   on Aug 9, 2023
2. KennethNielsen commented on Aug 9, 2023

   

   KennethNielsen

   on Aug 9, 2023

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   Hi @DangerLin

   I missed this in the inbox before vacation. If this is still a problem, can you share the code you use to connect?
3. JustAnEmployee commented on Aug 29, 2023

   

   JustAnEmployee

   on Aug 29, 2023

   Last edited by JustAnEmployee

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   Hi @KennethNielsen I've got the same issue with this issue.

   C:\Users\wan376\AppData\Local\Programs\Python\Python311\python.exe C:/Users/wan376/PycharmProjects/faster2/Potentiostat/test_potentiostat.py
   Traceback (most recent call last):
     File "C:\Users\wan376\PycharmProjects\faster2\Potentiostat\test_potentiostat.py", line 57, in <module>
       run_ocv()
     File "C:\Users\wan376\PycharmProjects\faster2\Potentiostat\test_potentiostat.py", line 12, in run_ocv
       sp150.connect()
     File "C:\Users\wan376\PycharmProjects\faster2\Potentiostat\bio_logic_driver.py", line 262, in connect
       address = create_string_buffer(self.address)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "C:\Users\wan376\AppData\Local\Programs\Python\Python311\Lib\ctypes\__init__.py", line 66, in create_string_buffer
       raise TypeError(init)
   TypeError: 192.168.0.257
   

   The code I ran was a copy paste of the example code from read the docs.

   def run_ocv():
       """Test the OCV technique"""
       ip_address = '192.168.0.257'  # REPLACE THIS WITH A VALID IP
       # ip_address = 'USB0'
       # Instantiate the instrument and connect to it
       sp150 = SP150(ip_address)
       sp150.connect()
   
       # Instantiate the technique. Make sure to give values for all the
       # arguments where the default values does not fit your purpose. The
       # default values can be viewed in the API documentation for the
       # technique.
       ocv = OCV(rest_time_T=0.2,
                 record_every_dE=10.0,
                 record_every_dT=0.01)
   
       # Load the technique onto channel 0 of the potentiostat and start it
       sp150.load_technique(0, ocv)
       sp150.start_channel(0)
   

   The point at which the code failed was

   # Communications functions
       def connect(self, timeout=5):
           address = create_string_buffer(self.address)
   

   I'm running python 3.11.4 in a windows environment.
4. DangerLin commented on Aug 29, 2023

   

   DangerLin

   on Aug 29, 2023

   Author

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   Hi @DangerLin

   I missed this in the inbox before vacation. If this is still a problem, can you share the code you use to connect?

   Hi Kenneth, my code is attached below:

   from __future__ import print_function
   from pprint import pprint
   import time
   from PyExpLabSys.drivers.bio_logic import SP150, CV
   
   ip_address = '169.254.72.33'
   
   #data save path
   save_path = 'D:\Data\EC lab\Danger\20230527\epx_1.csv' # file name is to be defined.
   
   def test_cv_technique():
       """Test the CV technique"""
       import matplotlib.pyplot as plt
       sp150 = SP150(ip_address)
       sp150.connect()
       cv_ = CV(vs_initial=(True,) * 5,
                voltage_step=(0.0, 0.5, -0.7, 0.0, 0.0),
                scan_rate=(100.0,) * 2,
                record_every_dE=0.01,
                N_cycles=1)
       sp150.load_technique(0, cv_)
   
       sp150.start_channel(0)
       ew_ = []
       ii_ = []
       run_time = []
       try:
           while True:
               time.sleep(0.1)
               data_out = sp150.get_data(0)
               if data_out is None:
                   break
               print(data_out.technique)
               print('Ewe:', data_out.Ewe)
               print('I:', data_out.I)
               print('time/s', data_out.time)
               ew_ += data_out.Ewe
               ii_ += data_out.I
               run_time += data_out.time
               print('cycle:', data_out.cycle)
       except KeyboardInterrupt:
           sp150.stop_channel(0)
           sp150.disconnect()
       else:
           sp150.stop_channel(0)
           sp150.disconnect()
       plt.plot(ew_, ii_)
       plt.show()
       print('end')
       
       CV.save_data(save_path)
   
   if __name__ == '__main__':
       test_cv_technique()
   
5. DangerLin commented on Aug 29, 2023

   

   DangerLin

   on Aug 29, 2023

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   JustAnEmployee

   Hi, sir, if you have a solution, could you please let me know? Thank you!
6. KennethNielsen commented on Nov 2, 2023

   

   KennethNielsen

   on Nov 2, 2023

   Member

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   Sorry, for the slow answer time. This seems to be a signature that changed over time, maybe after the whole Python2/3 debacle. The create_string_buffer function now expects bytes not str. So, if that is the only place where the IP-address is used, you could make a workaround by converting your IP-address to bytes before sending it into the class. Something like:

   ip_address = "192.168.1.2".encode("ascii")

   if this works, I will make a fix around it.