I just installed LabJack-217-12-20.exe and Python_LJM_2018_02_23. I'm trying to run the examples to talk to a T4 over USB or Ethernet. The openS() function fails as shown below unless I run it as an administrator.
File "eReadName.py", line 11, in <module>
handle = ljm.openS("T4", "ETHERNET", "10.5.0.61") # T4 device, Any connection, Any identifier
File "c:\Program Files\Python\lib\site-packages\labjack\ljm\ljm.py", line 312, in openS
error = _staticLib.LJM_OpenS(deviceType.encode("ascii"), connectionType.encode("ascii"), identifier.encode("ascii"), ctypes.byref(cHandle))
OSError: exception: access violation reading 0x0000000000000002
Kipling seems to have the same problem. I had to run it as admin or it hangs on startup. Is there a way to use the LabJack library without running as admin?
.png%3Fitok=PHGBxf6M "EEV Blog Reviews LabJack T7-Pro & Software Tools")
.jpg%3Fitok=B1YcuDFK)
.png%3Fitok=Ybt-OlgU "LabJack + JEDI One Can Create a Powerful Distributed DAQ Ecosystem")
Thanks for reporting the issue. This issue also occurs in Windows 10 for non-admin users, and looks like a general Windows, non-admin issue. The current workaround is to run LabJack applications and Python as admin to prevent the error. We will look at this closer, but are in the midst of some other LJM work so it will likely be a couple weeks before we have anything further on this.
I believe I've found a solution. I will release a new version of LJM that I expect will fix this issue for you and then I will update this thread. I expect that to happen tomorrow.
I've uploaded LabJack-2018-03-12-beta.exe, which contains LJM 1.1802. Please try it.
https://labjack.com/support/software/installers/ljm
We've been using 2018-03-12-beta for a few weeks and it seems to be working as expected without running as admin. Thank you for the quick fix!
Thank you for reporting the issue. I'm glad to hear it's resolved.
hello , I have the same issue. I use windows 10, labjackT7 pro.
I just installed LabJack-2019-15-20.exe and Python_LJM_2020_11_20. I'm trying to run the examples to talk to a T7 over USB. The openS() function fails as shown below unless I run it as an administrator.
self.handle = ljm.openS("T7", "ANY", "ANY") # T7 device, Any connection, Any identifier
reported error: exception: access violation reading 0x000000000111FFFF.
please, can you help me.
Do you see a similar issue trying to open the device in Kipling?
In the Python script, does specifying the device type make a difference and what device type are you using?
As a starting point, you could run the older installer (mentioned above) at the following link. Does using this version make any difference?
https://labjack.com/sites/default/files/software/LabJack-2018-03-12_1.exe
hello , I have the same issue. I use windows 10, labjackT7 pro.
Do you see a similar issue trying to open the device in Kipling?
=> yes I see the same issue trying to open the device in kipling.
In the Python script, does specifying the device type make a difference and what device type are you using?
=> self.handle = ljm.openS("T7", "ANY", "ANY") # T7 device, Any connection, Any identifier
As a starting point, you could run the older installer (mentioned above) at the following link. Does using this version make any difference? https://labjack.com/sites/default/files/software/LabJack-2018-03-12_1.exe
=> nothing change
Which connection type are you using? Also, what is the full error message you see running eReadName.py? What version of Python are you using?
The access violation error is vague and could be due to a number of different issues. Since the installer that resolved the previous issue in this thread did not resolve the issue for you, it should be fairly safe to say that the cause is something different.
I am not able to reproduce this issue with our newer installers, so it may be difficult to track down. I would recommend that you:
https://labjack.com/support/app-notes/usb-communication-failure
https://labjack.com/support/app-notes/basic-networking-troubleshooting