Python interface windows support

[mrmbernardi]

Windows support is alluded to on this line:

SZ3/tools/pysz/pysz.py

Line 21 in e78f483

"windows": "SZ3c.dll",

However it doesn't work since sys.platform returns win32 for Windows, not windows.

I have tried to use Sz3 through python on windows by patching this bug and building SZ3c with G++ and with MsBuild, but no matter what I tried I couldn't get it to work properly.

Perhaps to interface with python properly, it needs to be built with MsBuild and the functions need to be defined properly with __declspec like here:

SZ3/tools/zstd/zstd.h

Line 31 in e78f483

# define ZSTDLIB_API __declspec(dllexport) ZSTDLIB_VISIBILITY

[ayzk]

@mrmbernardi Thanks for pointing out the issue. I've changed the return to win32 from Windows. Have you tried the methods mentioned in this thread? #5 (comment)

[mrmbernardi]

Yes, when build with MSYS2, UCRT64, and G++, I get library not found errors from python (this is the error when the library is found but cannot be loaded for another reason).

If I build with MsBuild, the library is successfully loaded but the names are not mangled correctly.

[ayzk]

@mrmbernardi Just to clarify, the executable can run on Win but the Python binding has problems, right?

[mrmbernardi]

When I build MsBuild, the executable works. If I build with MSYS UCRT, I get an entry point not found error.