Best way to solve dual call???

[Michal Wallace]

On Mon, 31 Jul 2000, Arinté wrote:

> I have this app that allows python scripts to talk to devices thru a c++ app
> and a dll.  At certain times the device may need to send a message to the
> script like COVER_OPENED/COVER_CLOSED.  Currently, it is giving me a error
> in the Thread State stuff.  It works ok if there is a call to the script and
> while that call is being made then send the message.  Example I have a
> messagebox in my dll that python scripts can pop up, while the script is
> waiting for that messagebox to go away Messages from the device can safely
> make it in.  I could tell the testers to popup a window whenever a message
> may be expected, but that is not practical or possible.  Any hints on what I
> could do?

If you want a DLL to send a message back into your program, you're
probably talking about having a callback routine to catch it, right?

I ran into this situation trying to script a MIDI keyboard.  Every
time I pressed a note, python would completely crash.

I don't know if this is the ONLY way to solve the problem, but I found
it works best to have the callback written in C, and compile it as a
python module.

I'm not a very good C programmer (so I can't tell you much  more
than that) but I got the code working, and you can see it at
http://www.sabren.com/code/python/midi/

Cheers,

- Michal
------------------------------------------------------------------------
www.manifestation.com  www.sabren.com  www.linkwatcher.com  www.zike.net
------------------------------------------------------------------------