PEAK-System Forum

I have a simple python program using PCANBasic. It fails on execution with the following:

C:\My_Docs\...\NF_Processing\venv\Scripts\python.exe C:/My_Docs/.../NF_Processing/PCAN_Test.py
Traceback (most recent call last):
  File "C:/My_Docs/.../NF_Processing/PCAN_Test.py", line 28, in <module>
    objPCAN = PCANBasic()
  File "C:\My_Docs\...\NF_Processing\PCANBasic.py", line 378, in __init__
    self.__m_dllBasic = windll.LoadLibrary("C:\\MY Docs\\Phd\\PCAN-Basic API\\x64\\PCANBasic")
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\ctypes\__init__.py", line 442, in LoadLibrary
    return self._dlltype(name)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\ctypes\__init__.py", line 364, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] The specified module could not be found

Process finished with exit code 1

The python program PCAN_Test.py is:

Code: Select all

import sys
#import pyodbc
import numpy as np
import pandas as pd
import random
import time

import ctypes
from ctypes import *
#from ctypes import wintypes

sys.path.append('''C:\Python34\Projects\ARM''')
sys.path.append('''C:\Python34\Lib\site-packages\python_can-1.4-py3.4.egg\can\interfaces''')
sys.path.append('''C:\My_Docs\PhD\PCAN-Basic API\x64''')
#sys.path.append('''C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\Lib\ctypes''')
#sys.path.append(['C:\My_Docs\PhD\PCAN-Basic API\x64\'])

from PCANBasic import *
channel = PCAN_USBBUS1
#channel = PCAN_USBBUS2
baud = PCAN_BAUD_500K
timeprev = 0.0

## The Plug & Play Channel (PCAN-USB) is initialized
##
#objPCAN =# The Plug & Play Channel (PCAN-USB) is initialized
#
objPCAN = PCANBasic()
result = objPCAN.Initialize(channel, baud)

There is probably something very simple I'm doing wrong but have no idea what it is.

Thanks

Rob

Hello,

Is this error reproducable, if the PCANBasic API was installed using the PEAK-Device Driver Setup?

Dowload Peak Device Driver Setup:

https://www.peak-system.com/quick/DrvSetup

Make sure to check the "PCANBasic" option during the setup:

: DriverSetupPcanBasic.PNG (31.46 KiB) Viewed 9468 times

Please report back to us if this was able to resolve the issue.

Best Regards

Marvin

Marvin,

Tried what you suggested - Rebooted after. Still get a similar error:

Code: Select all

C:\My_Docs\PhD\NF_Processing\venv\Scripts\python.exe C:/My_Docs/PhD/NF_Processing/PCAN_Test.py
Traceback (most recent call last):
  File "C:/My_Docs/PhD/NF_Processing/PCAN_Test.py", line 28, in <module>
    objPCAN = PCANBasic()
  File "C:\My_Docs\PhD\NF_Processing\PCANBasic.py", line 378, in __init__
    self.__m_dllBasic = windll.LoadLibrary("C:\\MY Docs\\Phd\\PCAN-Basic API\\x64\\PCANBasic")
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\ctypes\__init__.py", line 442, in LoadLibrary
    return self._dlltype(name)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\lib\ctypes\__init__.py", line 364, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] The specified module could not be found

Process finished with exit code 1

no external download allowed - removed by admin

Thanks

Rob

You mix up 32/64 Bit DLLs. Search on your PC in all folders the file "pcanbasic.dll " - delete them all.
Run the Setup again as my colleauge wrote in the last post - select PCANBasic API.

If you want to understand read this:
viewtopic.php?f=116&t=886
and
viewtopic.php?f=41&t=870

We use Python (2.x and 3.x) with 32 and 64 Bit DLLs and Runtime, since years - it works without any problem if the environment is setup correct.

I ended up changing the reference to PCANBasic in PCANBasic.py thus which solved the problem:

if platform.system() == 'Windows':
# self.__m_dllBasic = windll.LoadLibrary("C:\\MY Docs\\Phd\\PCAN-Basic API\\x64\\PCANBasic")
# self.__m_dllBasic = windll.LoadLibrary("C:\\Windows\\SysWOW64\\PCANBasic")
self.__m_dllBasic = windll.LoadLibrary("C:\\Windows\\System32\\PCANBasic")

Thanks for your help

Rob

Also a solution!

PEAK-System Forum

OSError: [WinError 126] The specified module could not be found

OSError: [WinError 126] The specified module could not be found

Re: OSError: [WinError 126] The specified module could not be found

Re: OSError: [WinError 126] The specified module could not be found

Re: OSError: [WinError 126] The specified module could not be found

Re: OSError: [WinError 126] The specified module could not be found

Re: OSError: [WinError 126] The specified module could not be found