[wxPython-users] Re: Having a single instance and forwarding document open requests

[Doug Anderson]

Chris,

The following is in my python manual (which made me give up on named  =

pipes, which would have been perfect).  Specifically, the  =

"Availability" section turned me off to it, since it didn't include  =

Windows:

mkfifo(path[, mode ])
Create a FIFO (a named pipe) named path with numeric mode mode. The  =

default mode is 0666 (octal). The
current umask value is first masked out from the mode. Availability:  =

Macintosh, UNI X.
FIFOs are pipes that can be accessed like regular files. FIFOs exist  =

until they are deleted (for example with
os.unlink()). Generally, FIFOs are used as rendezvous between  =

=93client=94 and =93server=94 type processes: the
server opens the FIFO for reading, and the client opens it for  =

writing. Note that mkfifo() doesn=92t open the
FIFO =97 it just creates the rendezvous point.

-Doug

---

On Sep 27, 2007, at 11:23 AM, Chris Mellon wrote:

> On 9/27/07, Doug Anderson <doug at vitamindinc.com> wrote:
>> Steve,
>>
>> Thanks for your answers, but I don't think they are particularly
>> useful in my case.
>>
>> * Specifically, I am trying to support Windows, which doesn't have
>> portmap on 111 (at least, not on my Windows box).  ...and yes, I know
>> Windows is a pain in the butt sometimes, but I still need to  =

>> support it.
>>
>> * Yes, you can have multiple TCP connections through a single port
>> number.  I have spent quite a bit of time with TCP/IP.  ...but I
>> don't think you're understanding my usage model.  I'm writing a GUI
>> app.  What does that mean?  Let's think through it on Windows (Mac
>> and Unix have similar concepts, and yes I know that Unix came up with
>> it first).  We'll choose port 12356, as an example.  If you log in
>> with the user Steve and start up the app, it will now listen on port
>> 12356.  Now, I leave user Steve logged in and log in with user Doug.
>> Now, the user Doug tries to start the GUI app.  If I don't choose a
>> different port, Steve's program will get my TCP requests.
>>
>> * Yes, my XMLRPC glance was very quick.  I will admit that.  If you
>> think I should give it another glance (now that you understand my
>> usage), I will.
>>
>> * <Sigh> Sadly, ignorance is contagious.  I will admit that I have a
>> pretty bad strain of it, but I am at least trying to get better.  ;)
>>
>> -Doug
>>
>
> I suggest using named pipes, rather than TCP. This should work in  =

> Windows, too.
>
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