[python-win32] file descriptor issues using msvcrt.open_osfhandle()+os.fdopen()

[Scott Leerssen]

On Dec 19, 2011, at 7:38 PM, Amaury Forgeot d'Arc wrote:

> 2011/12/19 Scott Leerssen <sleerssen at gmail.com>
> >>> I just tried that, and after closing the file object and attempting to call win32api.ClosHandle() on the value returned by detach, I get an exception of "error: (6, 'CloseHandle', 'The handle is invalid.')"  Here's what the code looks like:
> >>>
> >>>    h = win32file.CreateFile(
> >>>        fname,
> >>>        win32file.GENERIC_READ,
> >>>        win32file.FILE_SHARE_READ,
> >>>        None,
> >>>        win32file.OPEN_EXISTING,
> >>>        win32file.FILE_FLAG_BACKUP_SEMANTICS,
> >>>        None
> >>>        )
> >>>    hd = h.Detach()
> >>>    fd = msvcrt.open_osfhandle(hd, os.O_RDONLY)
> >>>    f = os.fdopen(fd, 'rb')
> >>>    f.read()
> >>>    f.close()
> >>>    h.Close()
> >>>    win32file.CloseHandle(hd)
> 
> - h was Detach()ed, so h.Close() is a no-op.
> - you should not win32file.CloseHandle(hd), the handle now owned by the file object:
> f.close() called the C function fclose(), which called close(fd) which called CloseHandle.
> 
> f.close() is enough here!


Thanks, that's very helpful.

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