Recent changes to bugs

System.InvalidCastException: Return argument has an invalid type.

Olivier D — Thu, 13 Nov 2014 13:09:20 -0000

I’m working in a team that automatized measurement to characterize chips. Our environment is write in Python and we build drivers for each equipment.
Today I have trouble with an Tektronix Logic Analyzer (TLA7012). Tektronix give a DLL write in .NET to access to the equipment (TlaNetInterfaces.dll) and examples in C++, C# or VB but not in Python.

We began to access using Ethernet with success, but when we use a method that return a .NET reference we have an error. The same code has been built with Labview without problem.

Here my code:

Import clr
Slot = 1
Clr.AddReference(“TlaNetInterfaces”) # load the DLL reference on TLA
configFile= “Connect.config” # config file that contain IP address of TLA
ITlaSystem_reference= clr.Tektronix.LogicAnalyzer.TpiNet.RemoteTlaSystem.Connect(configFile) #open connection on TLA
ITlaSystem_object= clr.Tektronix.LogicAnalyzer.TpiNet.ITlaSystem(ITlaSystem_reference)
Print ITlaSystem_object.SWVersion #return TLA software version 5.8.027.0 for my case
UserName= ITlaSystem_object.GetModuleBySlot(slot) # It should return a reference on module slot 1 in the TLA

The last line of this code give me this error:
System.InvalidCastException: Return argument has an invalid type.

I try to convert the value return, but without success, I always have this error, like .NET module in python don’t support a reference return from a method.
If I can get this reference I can access to all other part of the equipment for example running an acquisition, but actually it’s not possible.

Do you have an idea where is the problem?

#23 Error registering EmptyArray (Windows 8.1 x64)

Clayton Stangeland — Fri, 11 Jul 2014 21:18:26 -0000

I had the same problem with a type with no namespace. Here are the genericutil changes that solved it.

@@ -36,12 +36,16 @@
// Register a generic type that appears in a given namespace.
//====================================================================

private static string Namespace(Type t)
{
return t.Namespace ?? "";
}
internal static void Register(Type t) {
Dictionary<string, List<string="">> nsmap = null;
mapping.TryGetValue(t.Namespace, out nsmap);
mapping.TryGetValue(Namespace(t), out nsmap);
if (nsmap == null) {
nsmap = new Dictionary<string, List<string="">>();
mapping[t.Namespace] = nsmap;
mapping[Namespace(t)] = nsmap;
}
string basename = t.Name;
int tick = basename.IndexOf("`");
@@ -80,7 +84,7 @@
```
 public static List<Type> GenericsForType(Type t) {
     Dictionary<string, List<string>> nsmap = null;
```
- mapping.TryGetValue(t.Namespace, out nsmap);
- mapping.TryGetValue(Namespace(t), out nsmap);
  if (nsmap == null) {
  return null;
  }
  @@ -99,7 +103,7 @@
```
 List<Type> result = new List<Type>();
 foreach (string name in names) {
```
  - string qname = t.Namespace + "." + name;
  - string qname = Namespace(t) + "." + name;
    Type o = AssemblyManager.LookupType(qname);
    if (o != null) {
    result.Add(o);

Error registering EmptyArray (Windows 8.1 x64)

Daniel Santana — Tue, 26 Nov 2013 17:18:00 -0000

Due to EmptyArray that doesn't have a namespace (null), i changed Register in genericutil do support this.

    internal static void Register(Type t) {
        Dictionary<string, List<string>> nsmap = null;
        // dgsantana: Correct bug for EmptyArray that doesn't have a namespace defined... ????
        var _namespace = string.IsNullOrWhiteSpace(t.Namespace) ? "" : t.Namespace;
        mapping.TryGetValue(_namespace, out nsmap);
        if (nsmap == null) {
            nsmap = new Dictionary<string, List<string>>();
            mapping[_namespace] = nsmap;
        }
        string basename = t.Name;
        int tick = basename.IndexOf("`");
        if (tick > -1) {
            basename = basename.Substring(0, tick);
        }
        List<string> gnames = null;
        nsmap.TryGetValue(basename, out gnames);
        if (gnames == null) {
            gnames = new List<string>();
            nsmap[basename] = gnames;
        }
        gnames.Add(t.Name);
    }

#22 IPython

Figopi — Sat, 28 Sep 2013 19:01:18 -0000

rebuilt from source and problem has gone away.

IPython

Figopi — Fri, 20 Sep 2013 06:29:28 -0000

Hi,

I can use pythonnet under python however when I import the clr under ipython or start a ipython session from with a python shell I get the following error.

I have included the stack trace for the latter - see below.

I have only a couple of months python experience so any help would be appreciated.

Many Thanks.

from IPython.frontend.terminal.ipapp import TerminalIPythonApp
import clr
app = TerminalIPythonApp.instance()
app.verbose_crash=True
app.initialize(argv=[]) # argv=[] instructs IPython to ignore sys.argv
Error in sys.excepthook:
Traceback (most recent call last):
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\application.py", line 175, in excepthook
return self.crash_handler(etype, evalue, tb)
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\crashhandler.py", line 158, in call
traceback = TBhandler.text(etype,evalue,etb,context=31)
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\ultratb.py", line 412, in text
tb_offset, context)
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\ultratb.py", line 963, in structured_traceback
ipinst = ipapi.get()
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\ipapi.py", line 28, in get
return InteractiveShell.instance()
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\config\configurable.py", line 318, in instance
inst = cls(args, kwargs)
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\interactiveshell.py", line 454, in init
self.init_readline()
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\interactiveshell.py", line 1779, in init_readli
ne
import IPython.utils.rlineimpl as readline
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\utils\rlineimpl.py", line 33, in
from readline import
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\readline.py", line 6, in
from pyreadline.rlmain import Readline
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\pyreadline__init.py", line 11, in
from . import unicode_helper, logger, clipboard, lineeditor, modes, console
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\pyreadline\console__init.py", line 15, in
from .console import *
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\pyreadline\console\console.py", line 21, in
import pyreadline.unicode_helper as unicode_helper
AttributeError: 'module' object has no attribute 'unicode_helper'

Original exception was:
Traceback (most recent call last):
File "", line 1, in
File "", line 2, in initialize
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\config\application.py", line 84, in catch_config_err
or
return method(app, args, *kwargs)
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\frontend\terminal\ipapp.py", line 324, in initialize

self.init_shell()

File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\frontend\terminal\ipapp.py", line 340, in init_shell

ipython_dir=self.ipython_dir)

File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\config\configurable.py", line 318, in instance
inst = cls(args, kwargs)
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\frontend\terminal\interactiveshell.py", line 360, in
init
user_module=user_module, custom_exceptions=custom_exceptions
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\interactiveshell.py", line 454, in init
self.init_readline()
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\core\interactiveshell.py", line 1779, in init_readli
ne
import IPython.utils.rlineimpl as readline
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\IPython\utils\rlineimpl.py", line 33, in
from readline import
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\readline.py", line 6, in
from pyreadline.rlmain import Readline
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\pyreadline__init.py", line 11, in
from . import unicode_helper, logger, clipboard, lineeditor, modes, console
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\pyreadline\console__init.py", line 15, in
from .console import *
File "C:\WinPython-64bit-2.7.5.3\python-2.7.5.amd64\lib\site-packages\pyreadline\console\console.py", line 21, in
import pyreadline.unicode_helper as unicode_helper
AttributeError: 'module' object has no attribute 'unicode_helper'

#20 PythonEngine.Initialize()

Calvin Wang — Thu, 01 Aug 2013 09:47:30 -0000

The patch fixes this bug.

#4 PythonException is not marked [Serializable]

Barton Cline — Sun, 23 Dec 2012 19:25:57 -0000

Will be in the update coming shortly

import clr crash on openoffice python

lvl — Sat, 28 Jul 2012 21:29:09 -0000

When using python for .net from Openoffice, a crash occurs on import clr.
The python module is called by "C:\Program Files\OpenOffice.org 3\program\soffice.exe" -nologo "vnd.sun.star.script:module.py$fonc?language=Python&location=user"

The module.py is in the user directory : C:\Documents and Settings\username\Application Data\OpenOffice.org\3\user\Scripts.
It contains :

import clr

def fonc(Arg1 = "-nothing-"):

pass

g_exportedScripts = fonc,

PythonEngine.Initialize()

malda — Fri, 30 Sep 2011 07:38:07 -0000

PythonEngine.Initialize() failed when anonymous type found in referenced assembly. In method GenericUtil.Register(Type t) there is no test for types which t.Namespace is null. When t.Namespace is null attempt to get it from dictionary 'maping' failed with message "Value cannot be null". Anonymous types are declared e.g. in Autofac.dll (wide use IoC container). Simple correction is just check if t.Namespace is null and then don`t process that type.

Stack corruption

xeph — Tue, 17 May 2011 17:52:42 -0000

I'm using python.net heavily in my server/client project

I found Stack buffer overflow exception OR stack corruption exception is caused when python script throws an exception, which is caught by CLR code especially when GC is collecting its own objects.
I think this problem is caused when allocated objects are unwinded by CLR engine.
(threw in CLR GC Collection/GC Security Cookie Check)

I found problem this 2 months ago, been struggling to solve this problem, because it happens rarely, randomly when GC is collecting objects
I solved this problem via removing all of pythonexception throwing code from PythonEngine, changed to return parameters to null

Hope you have better solution for solve this problem :)