Eryk Sun added the comment:
I occasionally come across code snippets on Stack Overflow, and projects such
as win-unicode-console (IIRC), that use ctypes to work with C stdio FILE
streams (sometimes for dubious reasons, such as a DLL API that uses FILE
streams). Maybe the _ctypes extension module could provide void pointers for
the current C stdin, stdout, and stderr -- as well as stdio functions such as
fflush, fopen, and freopen. This is already done with _ctypes._memmove_addr and
_ctypes._memset_addr. However, getting the current standard stream pointers
would need to use a callable or descriptor.
> it'd be good content for a "Best practices" section
The tutorial itself is outdated in places and doesn't promote best practices.
For example, it assigns a ValidHandle function to
windll.kernel32.GetModuleHandleA.restype, which would affect every module that
uses windll.kernel32. Also, this ValidHandle example is bogus, as is every
example in the tutorial that uses GetModuleHandle without setting restype to a
pointer type such as c_void_p. It's truncating 64-bit pointers to 32-bit int
values. You just need to try a DLL that loads at a high address:
>>> kernel32.GetModuleHandleA(b'advapi32')
-27590656
>>> def ValidHandle(value):
... if value == 0:
... raise WinError()
... return value
...
>>> kernel32.GetModuleHandleA.restype = ValidHandle
>>> kernel32.GetModuleHandleA(b'advapi32')
-27590656
>>> hex(kernel32.GetModuleHandleA(b'advapi32') & 2**32-1)
'0xfe5b0000'
>>> kernel32.GetModuleHandleA.restype = c_void_p
>>> hex(kernel32.GetModuleHandleA(b'advapi32'))
'0x7fefe5b0000'
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<http://bugs.python.org/issue23606>
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