Having a single instance and forwarding document open requests

[Doug Anderson]

Hi,

I'm trying to accomplish roughly the same thing as MacOpenFile does  
on the Mac, but on Windows.

For those unfamiliar, let me explain.  I want it so that if someone  
double-clicks on one of my document files, it will either:
- If no other copy of the app is running, it will start up the  
application and open the document.
- If another copy of the app is running, it will just tell that  
already-running copy to open the document.

Another way to put it: I'd like to work like Visual Studio works on  
Windows: opening a .c file from the file explorer doesn't open a  
separate copy of visual studio.

I'm using py2exe to create an application from my wxPython code.



Sorry if there's a simple way to do this, but I've been unable to  
find it.

* My best idea so far is to use the wx.SingleInstanceChecker.  With  
it, I can prevent the second copy of the app from starting up, but I  
can't communicate with it to tell it which documents to open.  I  
could use an out of band communication method (TCP sockets, a  
file, ...), but that seems very kludgy.

* I saw references elsewhere to using DDE on Windows.  Unfortunately,  
I'm not a DDE expert and there appears to be very little  
documentation in the context of python.  ...also, the wxwidgets DDE  
class doesn't appear to be supported on wxpython (unless I missed  
it), so I'd have to mix in win32 calls.  Ick.

* The pydocview stuff looks like it might be usable, though again I  
don't see any docs for it (and one piece of sample code that doesn't  
quite do what I want).


Thanks!

-Doug
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