[Python.NET] Problem to use a dll: System.ApplicationException: Error 1: OpenDevice: Invalid handle

[Tribble, Brett]

How does it differ from the working ironpython environment?

From: PythonDotNet [mailto:pythondotnet-bounces+btribble=ea.com at python.org] On Behalf Of Daniel Krause
Sent: Wednesday, January 16, 2013 11:49 AM
To: pythondotnet at python.org
Subject: Re: [Python.NET] Problem to use a dll: System.ApplicationException: Error 1: OpenDevice: Invalid handle

Hi Brett,

to check your suggestion I added a print statement to the script (after clr.AddReference("xiAPI40.NET"):

print sys.path

The result looks ok to me:

['C:\\Users\\mdk\\workspace\\camera\\', 'C:\\Python27\\lib\\site-packages\\distribute-
0.6.21-py2.7.egg', 'C:\\Python27\\DLLs', 'C:\\Python27\\lib', 'C:\\Python27\\lib
\\plat-win<file:///\\plat-win>', 'C:\\Python27\\lib\\lib-tk', 'C:\\Python27', 'C:\\Python27\\lib\\si
te-packages', 'C:\\Python27\\lib\\site-packages\\setuptools-0.6c11-py2.7.egg-inf
o', 'C:\\Users\\mdk\\.eclipse\\org.eclipse.platform_4.2.0_248562372\\plugins\\or
g.python.pydev_2.7.1.2012100913\\pysrc\\pydev_sitecustomize', 'C:\\Windows\\syst
em32\\python27.zip', 'C:\\Python27\\lib\\site-packages\\PIL', 'C:\\Python27\\lib
\\plat-win<file:///\\plat-win>', 'C:\\Python27\\lib\\site-packages\\setuptools-0.6c11-py2.7.egg-info
', 'C:\\Python27\\lib\\site-packages\\setuptools-0.6c11-py2.7.egg-info', 'C:\\Wi
ndows\\Microsoft.NET\\Framework64\\v4.0.30319\\']

I also copied the folder to a temp folder and run the script from there without adding the new path explicitly to the python path.

The new location is then automatically added to the path, and the console output looks the similar.

C:\temp\camera> python.exe .\testcam.py
['C:\\temp\\camera', 'C:\\Python27\\lib\\site-packages\\distribute-0.6.21-py2.7.egg', 'C:\\Windows\\system32\\python27.z
ip', 'C:\\Python27\\DLLs', 'C:\\Python27\\lib', 'C:\\Python27\\lib\\plat-win', 'C:\\Python27\\lib\\lib-tk', 'C:\\Python2
7', 'C:\\Python27\\lib\\site-packages', 'C:\\Python27\\lib\\site-packages\\PIL', 'C:\\Python27\\lib\\site-packages\\setu
ptools-0.6c11-py2.7.egg-info', 'C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\', 'C:\\Users\\mdk\\workspace\\camera\\']
Traceback (most recent call last):
  File ".\testcam.py", line 9, in <module>
    cam.OpenDevice(0)
System.ApplicationException: Error 1: OpenDevice: Invalid handle
   at xiApi.NET.xiCam.throwException(Int32 errNum, String param)
   at xiApi.NET.xiCam.OpenDevice(Int32 DevID)

Best regards
Daniel
2013/1/15 Tribble, Brett <btribble at ea.com<mailto:btribble at ea.com>>
You might try making and swapping in a simple assembly that opens a command prompt so that you can inspect the environment variables. For me, this is almost always a system path / current directory issue. Hopefully I'm not leading you down a false road.

From: m.daniel.krause at googlemail.com<mailto:m.daniel.krause at googlemail.com> [mailto:m.daniel.krause at googlemail.com<mailto:m.daniel.krause at googlemail.com>] On Behalf Of Daniel Krause
Sent: Tuesday, January 15, 2013 1:44 PM
To: Tribble, Brett
Subject: Re: [Python.NET] Problem to use a dll: System.ApplicationException: Error 1: OpenDevice: Invalid handle

No, I don't have the source, only the dll.

But thanks for the sugggestion.
Daniel

2013/1/15 Tribble, Brett <btribble at ea.com<mailto:btribble at ea.com>>
I assume you don't have the source to the .dll?

If you do, you can add a line to use debug the error using System.Diagnostics.Debugger.Break():

http://msdn.microsoft.com/en-us/library/system.diagnostics.debugger.break.aspx



From: PythonDotNet [mailto:pythondotnet-bounces+btribble<mailto:pythondotnet-bounces%2Bbtribble>=ea.com at python.org<mailto:ea.com at python.org>] On Behalf Of Daniel Krause
Sent: Tuesday, January 15, 2013 12:42 PM
To: pythondotnet at python.org<mailto:pythondotnet at python.org>
Subject: [Python.NET] Problem to use a dll: System.ApplicationException: Error 1: OpenDevice: Invalid handle

I am trying to use a dll to control a camera.
It is possible for me to use the dll with ironpython, but I fail to use it with python for .NET (CLR 4.0).
(And I would like to use e.g. numpy as well, so I need python for .NET).

Below follow a short test script, the python / ironpython versions and their console output when running the test script.

Any hints are welcome.
Thank you
Daniel

########################################################
#test script "testcam.py" #1 for python for .NET
import clr
import sys
sys.path.append("C:\\Users\\mdk\\workspace\\camera\\")
clr.AddReference("xiAPI40.NET")
from xiApi.NET import *
cam = xiCam()
cam.OpenDevice(0)
print cam.GetParamString(PRM.DEVICE_NAME) #print device name

###############
#console output showing the python version,
#installed is .NET-support with pythonnet-2.0dev.clr4.0.win-amd64-py2.7.exe on Win7 64bit
PS C:\Users\mdk\workspace\camera> python.exe
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.


###############
#running test script #1 with python, console output
Traceback (most recent call last):
  File "C:\Users\mdk\workspace\camera\testcam.py", line 8, in <module>
    cam.OpenDevice(0)
System.ApplicationException: Error 1: OpenDevice: Invalid handle
   at xiApi.NET.xiCam.throwException(Int32 errNum, String param)

   at xiApi.NET.xiCam.OpenDevice(Int32 DevID)

######################################################
#test script "testcam.py" #1 modified for ironpython, test script #2
import clr
import sys
sys.path.append("C:\\Users\\mdk\\camera\\")
clr.AddReference("xiAPI40.NET.dll")
from xiApi.NET import *
cam = xiCam()
cam.OpenDevice(0)
print cam.GetParamString(PRM.DEVICE_NAME)   #print device name

###############
#console output showing the ironpython version
PS C:\Users\mdk\workspace\camera> ipy.exe
IronPython 2.7 (2.7.0.40) on .NET 4.0.30319.17929
Type "help", "copyright", "credits" or "license" for more information.
>>>

##############
#running test script #2 with ironpython, console output
MQ013MG-E2


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