Eryk Sun added the comment:
> I would say almost all Windows console programs does use
> console's encoding for input/output because otherwise
> user wouldn't be able to read it.
While some programs do use the console codepage, even when writing to a pipe or
disk file -- such as more.com, reg.exe and tasklist.exe -- it's no where near
"all Windows console programs". As a counterexample, here's a list of Microsoft
utilities that always use the OEM codepage (CP_OEMCP) when writing to a pipe or
disk file:
attrib.exe
cacls.exe
doskey.exe (e.g /history)
fc.exe
findstr.exe (calls SetFileApisToOEM)
hostname.exe
icacls.exe
net.exe
qprocess.exe (also to console)
quser.exe (also to console)
sc.exe
sort.exe (also to console)
tree.com
To further ensure that we're on the same page, the following demonstrates what
happens for creation flags DETACHED_PROCESS, CREATE_NEW_CONSOLE, and
CREATE_NO_WINDOW in Windows 10:
from subprocess import *
DETACHED_PROCESS = 0x00000008
CREATE_NEW_CONSOLE = 0x00000010
CREATE_NO_WINDOW = 0x08000000
cmd = ('python -c "import ctypes;'
"kernel32 = ctypes.WinDLL('kernel32');"
'print(kernel32.GetConsoleCP())"')
>>> call('chcp.com 65001')
Active code page: 65001
0
>>> check_output(cmd, creationflags=0)
b'65001\r\n'
>>> check_output(cmd, creationflags=DETACHED_PROCESS)
b'0\r\n'
>>> check_output(cmd, creationflags=CREATE_NEW_CONSOLE)
b'437\r\n'
>>> check_output(cmd, creationflags=CREATE_NO_WINDOW)
b'437\r\n'
The test was run with a U.S. locale, so the OEM and ANSI codepages are 437 and
1252. With DETACHED_PROCESS there's no console, so GetConsoleCP() returns 0.
That's the value of CP_ACP, so ANSI is the natural default for a detached
process. CREATE_NEW_CONSOLE and CREATE_NO_WINDOW cause Windows to load a new
instance of conhost.exe, which is initially set to the OEM codepage.
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<http://bugs.python.org/issue27179>
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