Python To Houdini

[lynch_ppl]

Hello all,

The script I am referencing is here:

http://odforce.net/wiki/index.php/PythonToHoudini

It opens up a socket and send data back and forth from Python to Houdini.

I am attempting to make a class out of some of it...

The first time I run hou.command(), it works.

The second time I try to repeat a hou.command('some hscript here'), I get an error:

>>> import hou

>>> new=hou.hou()

>>> new.command('ls')

geo1

geo2

geo3

geo4

>>> new.command('ls')

Traceback (most recent call last):

File "<stdin>", line 1, in ?

File "hou.py", line 34, in command

self.hou_conn()

File "hou.py", line 10, in hou_conn

self.hou.connect(('localhost',12000))

File "<string>", line 1, in connect

File "/usr/lib/python2.4/socket.py", line 144, in _dummy

raise error(EBADF, 'Bad file descriptor')

socket.error: (9, 'Bad file descriptor')

any ideas of what is happening?

any help is much appreciated!

Here is the class:

#!/usr/bin/python
class hou:
	import socket
	hou = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

	def hou_conn(self):
		self.hou.connect(('localhost',12000))
		return()

	def send_data(self,command):
		self.hou.send(command + '\n')
		return()

	def get_data(self):
		delimiter = '\x00'
		buffer = ""
		while delimiter not in buffer:
			buffer = buffer + self.hou.recv(8192)
		return(buffer[:-2])

	def hou_close(self):
		self.hou.close()
		return()

	def command(self,command):
		self.hou_conn()
		self.send_data(command)
		buffer = self.get_data()
		print buffer
		self.hou_close()

[TheUsualAlex]

Hello,

It seems like problems is occuring in your command method where you are calling self.hou_conn() the second time around. Perhaps your socket wasn't closed or something that's causing the problem.

What I did was to comment out your self.hou_conn() and self.hou_close() in your command method, and then when you're actually running your class, do something like:

	new = hou()
	new.hou_conn()
	new.command('ls')
	new.command('ls')
	new.hou_close()

That seems to work.

I think that it might be a good idea to actually do your hou_conn() call inside the hou constructor ( def __init__(self): ), so that whenever you instantiate your class object, hou_conn() get called automatically, you run your commands until you are done, then manually call your hou_close() method. That way, you are not constantly opening and closing your connections whenever command method get called.

Anyways, about a year ago while I was just starting to learn python, I put together this version of Houdini socket (as an exercise), I never got around to finishing other funcationalities I wanted to add for this module and hasn't even touched this file since then... Perhaps it might be helpful to you?

Hope this helped.

Alex

classHoudini.py.gz

[lynch_ppl]

Alex,

Much appreciated. That definetly helped out! Thank you thank you.

Here is the newly updatred class:

#!/usr/bin/python
class hou:
	import socket
	hou = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

	def __init__(self):
		self.hou_conn()
		print 'Connected to Houdini...'

	def hou_conn(self):
		self.hou.connect(('localhost',12000))
		return()

	def send_data(self,command):
		self.hou.send(command + '\n')
		return()

	def get_data(self):
		delimiter = '\x00'
		buffer = ""
		while delimiter not in buffer:
			buffer = buffer + self.hou.recv(8192)
		return(buffer[:-2])

	def hou_close(self):
		self.hou.close()
		return()

	def command(self,command):
		self.send_data(command)
		buffer = self.get_data()
		print buffer

[lynch_ppl]

Here is a term class that emulates the textport...

#!/usr/bin/python
class hou:
	import socket
	hou = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

	def __init__(self):
		self.hou_conn()
		print 'Connected to Houdini...'

	def hou_conn(self):
		self.hou.connect(('localhost',12000))
		return()

	def send_data(self,command):
		self.hou.send(command + '\n')
		return()

	def get_data(self):
		delimiter = '\x00'
		buffer = ""
		while delimiter not in buffer:
			buffer = buffer + self.hou.recv(8192)
		return(buffer[:-2])

	def hou_close(self):
		self.hou.close()
		return()

	def command(self,command):
		self.send_data(command)
		buffer = self.get_data()
		print buffer

class term(hou):
	def __init__(self):

	  hou.__init__(self)
	  print 'type "exit" to close connection...'
	  while 1:

		   self.pwd()
		   self.hpwd = "%s%s" % (self.hpwd, '/->')
 		   line = raw_input(self.hpwd)
		   if line == 'exit':
			 self.hou.close()
			 print 'Connection closed...'
			 break
		   self.command(line)

	def pwd(self):

		   self.send_data('pwd')
		   buffer = self.get_data()
		   self.hpwd = buffer