Install m2crypto failed in Windows 10 with Python 3.7

[mobilEKG]

Try to install the requirements:

pip install -r requirements.txt

Get the following error:

...
  _m2crypto_wrap.c
  SWIG/_m2crypto_wrap.c(3561): fatal error C1083: Cannot open include file: 'openssl/err.h': No such file or directory
  error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.24.28314\\bin\\HostX86\\x64\\cl.exe' failed with exit status
 2
...
```
Any hint?

[tech234a]

I was able to get m2crypto installed and working in Python 2.7 on Windows 10 by first running pip install wheel. I have not gotten it working on Python 3.8.1 so far.

[tech234a]

Some builds for m2crypto for specific versions of Python are available from their CI: https://ci.appveyor.com/project/m2crypto/m2crypto/history. Try selecting a version, selecting a job that matches your Python version, then going to the "Artifacts" tab and downloading an installer. To install a .whl file, see step 11 of my build tutorial below.

I have also attached the m2crypto module that I have built on Windows 10 x64, Python 3.8.1. It should work on any x64-based version of Windows with any version of Python 3.8.X. M2Crypto-0.35.2.win-amd64-py3.8.zip

However, if you are unable to find a build that matches your Python version and system type and architecture, you may need to manually build m2crypto. I adapted the build steps from their CI build scripts: https://gitlab.com/m2crypto/m2crypto/blob/master/appveyor.yml. I built the module by doing the following:

1. Install the latest Build Tools for Visual Studio 2019. See https://visualstudio.microsoft.com/downloads/ under "All Downloads" -> "Tools for Visual Studio 2019". This direct link was active as of this writing: https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=16
2. In the installer, select "C++ Build Tools", install, and reboot if necessary.
3. Install the latest full (not Light) OpenSSL for your architecture (Win64/Win32). Current version as of this writing is 1.1.1d. Make note of the directory to which you install OpenSSL. https://slproweb.com/products/Win32OpenSSL.html
4. In PowerShell, install the Chocolatey package manager. I used this command from their website: Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
5. Install swig with Chocolatey (in PowerShell). choco install -r -y swig
6. Install the pywin32 dependency. Run pip install pywin32. If you have problems, try first running pip install wheel. To get pip to target a specific Python installation, try launching it using py -[version] -m pip install [module]. Note: you may need to use an elevated (administrator) PowerShell to install Python modules.
7. Get the latest m2crypto code. If you have git installed, run git clone https://gitlab.com/m2crypto/m2crypto. Otherwise, download and extract the code from GitLab: https://gitlab.com/m2crypto/m2crypto/-/archive/master/m2crypto-master.zip
8. Use cd to change into the directory m2crypto was cloned/extracted to.
9. Assuming python launches your desired Python interpreter version, run python setup.py build --openssl="C:\Program Files\OpenSSL-Win64" --bundledlls, replacing C:\Program Files\OpenSSL-Win64 with the directory to which you installed OpenSSL. (On some systems you can use the py launcher to specify a Python version to use, run py -h for more information.)
10. Generate the installable files. python.exe setup.py bdist_wheel bdist_wininst bdist_msi.
11. Install the module. cd into the dist directory and run pip install M2Crypto-0.35.2-cp38-cp38-win_amd64.whl, replacing the filename with the generated .whl file. If you have problems, try first running pip install wheel. To get pip to target a specific Python installation, try launching it using py -[version] -m pip install [module]. Alternatively, you can run the generated .exe or .msi installer. Note: you may need to use an elevated (administrator) PowerShell to install Python modules.

[mobilEKG]

Follow the upper instruction, it works like a charm! Thank you tech234a!

[cperezabo]

Hi, I've created this repo with pre-compiled wheels so you don't have to do all the steps, just download the .whl and install it!

[warifp]

I was able to get m2crypto installed and working in Python 2.7 on Windows 10 by first running pip install wheel. I have not gotten it working on Python 3.8.1 so far.

Thankyou !

[tonirojas]

I failed at step 9 of [tech234a] instructions, always having the same error:
...
running build
running build_py
running egg_info
writing src\M2Crypto.egg-info\PKG-INFO
writing dependency_links to src\M2Crypto.egg-info\dependency_links.txt
writing top-level names to src\M2Crypto.egg-info\top_level.txt
error: Could not find module 'libssl.so' (or one of its dependencies). Try using the full path with constructor syntax.
...

any hint?