How does softwares block access when they identify a 32bit PC, and how can I perform this with Python ?
I haven't used it, but the cpuinfo module looks like it should work. Maybe try installing that module from pip and then test cpuinfo.get_cpu_info()["bits"] == 32
Related
I am working on Windows 10 presently and need to put some code if the platform is Windows 10. So, I checked in python docs and read about platform module. This is what the documentation says :
platform.win32_ver(release='', version='', csd='', ptype=''):
Get additional version information from the Windows Registry and return a tuple (release, version, csd, ptype) referring to OS release, version number, CSD level (service pack) and OS type (multi/single processor)
When I tried the same function on my Windows 10 machine I got below :
>>> platform.win32_ver(）
('8', '6.2.9200', '', u'Multiprocessor Free')
But, I was expecting the release to be 10 instead of 8.
So, any idea if I am missing something here ?
Also, can somebody please tell me if there exists any other way to detect if the windows platform is Windows 10 ?
The problem is python uses GetVersionEx to determine the version.
As you can read here, Microsoft doesn't support this anymore and offers a different API.
However, you can always call the new API yourself, or check the registry value at HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion.
You can also use WMI to get the Win32_OperatingSystem instance.
I'd also like to note that specific version checking is generally considered a bad practice.
I've been trying to extend my python script with a C++ code. I was able to do that with the simple libraries of C++ (print "hello world"). I followed the tutorial available in the link below:
http://www.tutorialspoint.com/python/python_further_extensions.htm
When I tried to add to my C++ code opencv libraries I encountered the following problem:
ImportError: /usr/local/lib/python2.7/dist-packages/kalman.so: undefined symbol: _ZN2cv3Mat10deallocateEv
I searched for many solutions on the internet, and I found one common answer that didn't workout for me:
"I was able to solve this by going to /usr/lib64/pkgconfig and modified opencv.pc to explicitly have all libraries. I also had to move the plugins from /usr/lib/gstreamer-0.10 to /usr/lib64/gstreamer-0.10"
Please note that I am using ubuntu 14.04 LTS 64-bit and I am planning to run my code later on on a raspberry pi model B running Raspbian OS.
Thank you.
NJ
Check your shared library kalman.so with ldd like so:
$ ldd kalman.so
And you will see that you are missing some libraries. That means that you have to provide some correct path to one of the libraries you use in your code at the linkage stage. something like
$ ...the way you do linking ... -L path_to_the_missing_library
For more information, please, consult this link.
I've met the same problem as you do, and at last I figured out that this is because I didn't add the linking library of opencv when compiling. Try to add the "opencv_core" or other related library when you compile the c++ source file.
Wish this to be helpful to you.
I'm using CPython and I have a C# dll. I'm trying to use Python for .NET to make them talk. I can't use IronPython because I need to integrate this into an existing CPython system.
I'm completely new to Python for .NET, and I actually have very little experience with Python and no experience with C#. So please forgive me if my question seems very basic.
I'm using Python 2.7.3, and I downloaded
pythonnet-2.0-alpha2-clr2.0_131_py27_UCS2 and unzipped it into a folder named pyfornet_test, which also contains the dll I'm trying to use (called DotNet4Class.dll)
Then I run this:
import sys
import os
import clr
sys.path.append(r"C:\pyfornet_test")
clr.AddReference("DotNet4Class.dll")
Which gives me this error:
System.IO.FileNotFoundException: Unable to find assembly 'DotNet4Class.dll'.
at Python.Runtime.CLRModule.AddReference(String name) in C:\Users\Barton\Documents\Visual Studio 2008\Projects\PyShar
p\trunk\pythonnet\src\runtime\moduleobject.cs:line 375
Any advice would be much appreciated. Thank you!
One reason can be Windows was not enabling it to load from "external sources". To fix this:
Right-click on the .dll
"Properties"
Under "General", click "Unblock"
Try this (without extension .dll):
clr.AddReference(r"C:\pyfornet_test\DotNet4Class")
Is DotNet4Class.dll built against .NET 4? I assume so based on the naming of the dll.
Note the issue here: http://sourceforge.net/tracker/?func=detail&aid=3293169&group_id=162464&atid=823891
clr.AddReference fails when assembly is built with .NET 4.0 - ID: 3293169
I'd read the solution, but essentially, you need to rebuild and recompile the python for .NET project under .NET 4.
I'll also mention that projects like this, that aren't actively developed and used by lots of people, generally have subtle idiosyncrasies that make knowledge of the platform essential to work around problems such as this. It sounds like you're trying to hack this solution in without understanding much about python or .NET which is always going to be fraught with problems.
Did you try clr.FindAssembly?
import clr
import sys
assemblydir = r"C:\pyfornet_test"
assemblypath = r"C:\pyfornet_test\DotNet4Class.dll"
sys.path.append(assemblydir)
clr.FindAssembly(assemblypath)
I don't know why it works, but this code works on my computer (Python 2.7, .NET4)
I have code like this (I copied MyRightClickMenuService.dll to the same directory as my script.py). It is built against .Net 4.0.
# script.py
import clr
import os
import sys
sys.path.append(os.path.dirname(__file__))
clr.AddReference('MyRightClickMenuService')
clr.AddReference('System')
clr.AddReference('System.Security')
from MyRightClickMenuService import (
AclSecuredNamedPipeBinding,
MyMenuItem,
MyContextMenuService,
etc
)
Checklist
The folder(s) containing the DLL(s) is/are added to sys.path before loading. You may append, or sys.path.insert(0, dll_folder) to put it first on the list.
You call clr.AddReference('my_dll') without the dll extension (for my_dll.dll), after adding the folder to sys.path
The DLL Target Architecture is the same as the CPython version bitness. That is, if Architecture is x64, use 64-bit python, and if Architecture is x86, use 32-bit python. (instructions for this below)
How to check target Architecture for DLL?
I Used ILSpy (free and open source) -> Open DLL -> Check the output. Below example output.
What worked for me was to Unblock the dll file.
if u download the dll file or took it from different computer it might be blocked. So unblocked solved the issue for me.
To unblock right click on the properties if the dll file and check the Unblock box at the bottom
I am using python 2.6.5 on an Ubuntu intalled server.
I need to integrate an API for our applicaion, in that case, i needed to use a DLL given to me by the API provider. Their example of code about api integration is written in Visual Basic... I made a search on google and found some examples of using ctypes , and i try using cdll and pydll, which caused the following error...
OSError: /home//some.dll: invalid ELF header
One possibility is using IronPython, but i do not have much information about ironpython so i am not sure if it will handle my needs completely..
Is there any available module that let me use that dll on python (or aynthing that i am missing from the exixting ones). It is hard to upgrade my python version?
DLLs may be windows creatures, but if a DLL is 'pure .NET' and doesn't utilize executables specific to windows etc., then it can work often in Linux, through Mono. (mono ipy.exe).
Ironpython's System and similiar windows modules are customized to be os agnostic (to a untested degree).
I have successfully run NHibernate, FluentNHibernate, log4net, and a few other commonly used DLLS in Ubuntu.
import clr
import sys
sys.path.append(os.path.abspath('./DLL')) #where your dlls are
clr.AddReference('System')
clr.AddReference('FluentNHibernate')
from FluentNHibernate.Cfg.Db import PostgreSQLConfiguration
The key seems to be to import DLLs in this fashion. If a dll imports another (fluentnhibernate imports nhibernate), you don't need to import Nhibernate for example.
DLLs are Windows creatures. The only way you'll be able to use a DLL is by using a Windows build of Python. You'll be able to run Windows Python on Ubuntu by having Windows installed inside a virtual machine. You also might be able to run it using Wine.
An alternative, of course, is to ask your API provider if they have a Linux version of the API.
First, check if your DLL is a .NET Assembly file. An "Assembly DLL file" has nothing to do with the assembler. It's simply a way the .NET framework stores its bytecode inside a DLL file!
Do file library.dll in Linux. If it says something like this:
PE32 executable (DLL) (console) Intel 80386 Mono/.Net assembly, for MS Windows
then you're lucky: it's an assembly file. You can run it on Linux.
Install Mono. Install Python.NET. Forget IronPython: it's dead.
Now, in Python.NET, you can do this:
import clr
clr.AddReference('./library.dll')
# the library has just registered a namespace we can use
from LibraryName import *
but how do you know what to import?
Auto-complete.
Or use monop tool to inspect the DLL like this:
$ monop -r library.dll
Assembly Information:
LibraryName
Version=9.9.3.0
Culture=neutral
PublicKeyToken=null
LibraryName.ClassName
...
$ monop -r library.dll LibraryName.ClassName
public class ClassName {
public ClassName (string inputString);
...
}
and it will tell you everything about that library
I'm trying to compile a python project into an executable. To test this, I've got Py2Exe installed, and am trying to do their Hello.py test. Here is hello.py:
print "Hello World!"
Here is my setup.py:
from distutils.core import setup
import py2exe
setup(console=['hello.py'])
I do the following on the command line:
python setup.py py2exe
And I get it mostly working until it start 'finding dlls needed', at which point we get:
Traceback:
<some trace>
ImportError: DLL load failed: %1 is not a valid Win32 application.
Python version is 2.6.6, and I'm on a 32-bit machine running Windows 7. Any ideas or help most appreciated.
In my experience py2exe is rather difficult to use, a bit hit-and-miss in terms of whether it will work or not, and an absolute nightmare to get working at all with any matplotlib import.
I realise this question is quite old now, but I am not sure why people continue to use py2exe when there are much smoother functioning alternatives available. I have have good results with pyinstaller (which was recommended to me after asking a question here on SO where I was also battling with py2exe). Now every time I have tried it it "just worked", so if you're still interested in packing up python code into executables then try give this app a shot instead.
http://www.pyinstaller.org/
Note: py2exe hasn't been updated for some years, while python and 3rd party modules have, which must be partly why it often doesn't work particularly well these days.
Sounds like step 5 in this tutorial describes what you are experiencing:
http://www.py2exe.org/index.cgi/Tutorial#Step5
I had this same problem, this is what I was able to do Q-A. Basically, I downloaded the updated sqlite dll file from sqlite.org. I replaced the py2exe generated DLL file with this new file. The program worked after that. Do make sure you download the 32-bit DLL, however.