Eryk Sun added the comment:
Nothing can be done about this from Python. It's a bug in how Explorer handles
the dropped filename.
Note that it's not simply replacing Unicode characters with question marks.
It's using a best-fit ANSI encoding. For example, codepage 1252 maps "Ā" to
"A". If there's no defined best-fit mapping, most codepages default to using
"?" as the replacement character when encoding via WideCharToMultiByte. When
decoding via MultiByteToWideChar, some codepages (e.g. 932), use katakana
middle dot (U+30FB) as the default instead of a question mark.
For example, here's the commandline of py.exe when I drop a file named "Ā.txt"
on a script. Note that "Ā" becomes "A":
0:000> ?? @$peb->ProcessParameters->CommandLine
struct _UNICODE_STRING
""C:\Windows\py.exe" "C:\Temp\test.py" C:\Temp\A.txt "
+0x000 Length : 0x68
+0x002 MaximumLength : 0x6a
+0x004 Buffer : 0x00771d50 ""C:\Windows\py.exe"
"C:\Temp\test.py" C:\Temp\A.txt "
It's bizarre that it encodes the filename as ANSI just to decode it later when
it calls CreateProcess. But Explorer probably still has a lot old code from
back when it had to run on both Windows NT and DOS-based Windows 9x. This is
probably a vestige of some workaround.
It isn't a problem if you ShellExecuteEx the Python script. For example, I ran
"C:\Temp\test.py C:\Temp\Ā.txt" in the command prompt, and here's the resulting
command line:
0:000> ?? @$peb->ProcessParameters->CommandLine
struct _UNICODE_STRING
""C:\Windows\py.exe" "C:\Temp\test.py" C:\Temp\Ā.txt"
+0x000 Length : 0x68
+0x002 MaximumLength : 0x6a
+0x004 Buffer : 0x00981cf8 ""C:\Windows\py.exe"
"C:\Temp\test.py" C:\Temp\Ā.txt"
Explorer actually handles drag and drop correctly when dropping the file on
another window. So as a (clunky) workaround, you can drag the script icon into
a command prompt or Win+R run dialog, and then drag the target file. The shell
should add quotes where required.
----------
nosy: +eryksun
resolution: -> third party
stage: -> resolved
status: open -> closed
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Python tracker <[email protected]>
<http://bugs.python.org/issue27469>
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