Drag a file into emacs-w32 frame

Daniel Colascione dancol@dancol.org
Mon Mar 4 21:41:00 GMT 2013

On 3/4/2013 1:39 PM, Corinna Vinschen wrote:
> On Mar  4 16:26, Ken Brown wrote:
>> On 3/4/2013 11:24 AM, Arthur Tu wrote:
>>> Today when i tried to drag a file whose name containing chinese
>>> characters into emacs, it failed to open.
>>> Here is the brief review:
>>> 1. a file with a pure english file name to emacs-32 frame:
>>>     open successfully.
>>> 2. a file with chinese characters in its name to emacs-32 frame:
>>>      error message: "dnd-open-local-file: Can not read
>>> file:/cygdrive/c/Users/Arthur/Desktop/%20%20%20%20.txt".
>>>     in fact, i tried several times with different name. the name was
>>> always decoded as a punch of "20%", even though different chinese
>>> characters were there.
>>> 3. the same file with chinese characters in its name to a emacs-nox
>>> frame(mintty):
>>>     the file name was pasted into the buffer correctly. chinese
>>> characters were shown correctly. the file wasn't open. (This is what's
>>> expected to happen in terminal session.)
>>> So my question was around the situation 2.
>>> How did the emacs-w32 handle the dragged file?
>> The code for handling the file name appears to be in src/w32fns.c.
>> I don't know what the issues are in trying to make it work when the
>> name contains Chinese characters.  Daniel?
> Cygwin is using UTF-8 as codeset by default.  Is it possible that
> w32fns.c is using *shudder* Windows functions to load the file?  If so,
> it uses the current Windows ANSI codepage, perhaps cp850 or some such.
> Bottom line: Use Windows functions for the GUI as much as you like.
> But don't use the Windows file API.  Use Cygwin functions for that.  If
> you have to use a Windows functions to fetch the filename, use the
> UNICODE Windows functions (the one with the trailing W) and convert the
> filename to the current Cygwin codeset using cygwin_conv_path
> (CCP_WIN_W_TO_POSIX, ...).

God no --- we're not using Win32 filesystem API functions in cygw32 Emacs. I
haven't had a chance to take a look at the problem yet, but it's probably just a
URI-encoding issue. Emacs insists on receiving drag-and-drop events as URIs,
even if they come in as filenames and pop back out the other end as filenames.

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