eryksun added the comment:
>> python's DLL already has the necessary "complete manifest," right?
>
> In theory yes, but apparently it isn't working in this case. It
> needs more investigation to figure out why.
The manifest in the DLL is stored as resource ID 2. This secondary manifest is
used by the loader to create a temporary activation context while python27.dll
is loaded. Thus allows it to load msvcr90.dll.
[python27!DllMain][1] stores the current activation context. This gets
reactivated when loading extension modules. Thus when Python 2.7 is embedded,
there's no problem loading extensions that depend on msvcr90.dll, such as
_ctypes.pyd.
If _Py_ActivateActCtx and _Py_DeactivateActCtx were exported, they could be
called in [_ctypes!load_library][2]. That should solve this problem with using
ctypes.CDLL('msvcr90') in embedded Python.
> Windows keeps shipping msvcrt.dll for backwards compatibility (for
> applications that rely on msvcrt.dll entirely - not piecemeal).
Windows itself is the primary user of msvcrt.dll. A Windows 7 installation has
over 1500 DLLs and over 350 executables in System32 that depend on msvcrt.dll.
Windows developers such as Raymond Chen get a bit annoyed when projects link
directly with msvcrt.dll. See [Windows is not a Microsoft Visual C/C++ Run-Time
delivery channel][3].
> Yeah, geos_c.dll really should have exported its own free()
> function.
Each CRT uses a private heap, so mismatching free() and malloc() from different
CRTs is wrong. geos_c really should export a free() function. Actually, it
really should have the user allocate data.
[1]: https://hg.python.org/cpython/file/15c95b7d81dc/PC/dl_nt.c#l79
[2]:
https://hg.python.org/cpython/file/15c95b7d81dc/Modules/_ctypes/callproc.c#l1267
[3]: http://blogs.msdn.com/b/oldnewthing/archive/2014/04/11/10516280.aspx
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