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

[Doug Anderson]

Dusty,

Thanks for the followup!  Yeah, it bugs me when I find a question  
that's the exact same as mine (and with no answers) posted.

Your solution is probably the best one.  I remember thinking about  
it, but for some reason dismissed it.  I figured that since I was  
already using the filesystem for some communication (about the port  
number), I might as well just go whole hog and use the filesystem for  
all my communication.  My solution (using the filesystem for all  
communication) worked, but I bet the TCP method would be just a hair  
more reliable (and more efficient, since I couldn't find a way to  
efficiently block on a file being created).

BTW: for the person reading the archives, picking a "well-known" file  
location should involve the use of:
	wx.StandardPaths.Get().GetUserLocalDataDir()

-Doug

---

On Sep 27, 2007, at 11:05 AM, Dusty Phillips wrote:

> On 27/09/2007, Doug Anderson <doug at vitamindinc.com> wrote:
>> I decided against TCP socket, mostly because:
>> - You've got to pick an arbitrary port and hardcode it.  If that port
>> is taken, you are stuck with a really obscure failure case (not
>> common, but I'm paranoid).
>> - You can't support multi-user systems well (each user should have
>> their own single instance), since their TCP sockets would collide.
>
> For the record (too many times I've seen mailing list archives with
> questions but not answers! ;-), this can be easily solved as follows:
>
> Pick an arbitrary open port at startup and store it in a well-known
> file location. It can be a different port for each user and isn't
> hard-coded.
>
> Dusty
>
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