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== Building the Python Bindings ==
== Building the Python Bindings ==


See [[Building LLA]]  but run ''./configure --enable-python-libs''
You need the python version of protocol buffers installed.


Note that you have to install Swig in order to build the python bindings (sudo apt-get install swig)
See [[Building LLA]]  but run


There is also a forgotten data in lla/python/Makefile : you have to add -I../include to the value of DEFAULT_INCLUDES at the line 70.
<pre>
$ ./configure --enable-python-libs
</pre>


At the end of the installation, you should run ldconfig as root in order to use the python bindings.
Check where the modules are going to be installed:
 
<pre>
$ grep ^pythondir config.log
pythondir='/Library/Python/2.5/site-packages'
</pre>
 
Run the usual: make, make check, make install.
 
Check that the modules have been installed correctly in the $pythondir above.
 
Check that $pythondir appears in sys.path:
 
<pre>
$ python -c "import sys; print sys.path"
</pre>
 
If it doesn't add it to $PYTHONPATH:
 
<pre>
$ export PYTHONPATH=$PYTHONPATH:/path/to/your/install/dir
</pre>
 
You probably want to put this line in your shell .rc file.


== Interesting Classes ==
== Interesting Classes ==

Revision as of 18:50, 9 January 2011

Building the Python Bindings

You need the python version of protocol buffers installed.

See Building LLA but run 

$ ./configure --enable-python-libs

Check where the modules are going to be installed: 

$ grep ^pythondir config.log
pythondir='/Library/Python/2.5/site-packages'

Run the usual: make, make check, make install.

Check that the modules have been installed correctly in the $pythondir above.

Check that $pythondir appears in sys.path: 

$ python -c "import sys; print sys.path"

If it doesn't add it to $PYTHONPATH: 

$ export PYTHONPATH=$PYTHONPATH:/path/to/your/install/dir

You probably want to put this line in your shell .rc file.

Interesting Classes

LlaClient
the main connection class
dmxBuffer
represents a list of DMX channel values
LlaClientObserver
base class to handle events
LlaPlugin
represents a Plugin
LlaDevice
represents a Device

Sending DMX

A simple example to send DMX: 

from lla import *
import sys

con = LlaClient()
if con.start():
  sys.exit()

universe = 0

# create a dmxBuffer for the channel values
DMX_LEN = 512
dmx = dmxBuffer(DMX_LEN)
for i in range(0, DMX_LEN):
  dmx[i] = i

con.send_dmx(universe, dmx, DMX_LEN)

Receiving DMX

Receiving is slightly harder, we need to setup an Observer object to handle the events:

THIS ISN'T WORKING YET [simonn] 

from lla import *
import sys

class Observer(LlaClientObserver):
  """ Handle the events """
  def new_dmx(self, uni, length, data):
    """ Called with new dmx buffer """
    return 0


# create a new LlaClient
con = LlaClient()

# create an observer object and register
ob = Observer()
con.set_observer(ob)

if con.start():
  sys.exit()

con.register_uni(1, LlaClient.REGISTER)

while True:
  con.fd_action(1)
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