Help with ResourceGroupListener

I've tried to make a progressbar by using the ResourceGroupListener that comes with OGRE, but I've failed to get it to work. I've tried a lot of tricks and I'm guessing that there's either a really simple solution that I've overlooked, or it's not bound in PyOgre yet.

It seems part of the problem is that ResourceGroupListener is an abstract class (IIRC), so when I do


class VWResourceListener(ogre.ResourceGroupListener):
def resourceLoadStarted(*args):
"""resourceLoadStarted(self, ResourcePtr resource)"""
for x in args:
print x

and then


resListener = VWResourceListener()
ogre.ResourceGroupManager.getSingleton().addResourceGroupListener(resListener)


I get.. well, I don't get any error messages (at least not as often) since I built PyOgre from the SVN, it just crashes now. But it used to crash with the message "Expected ResourceGroupListener, got VWResourceListener", or something along those lines.

And I can't add
ogre.ResourceGroupListener.__init__(self)
because as I said, it's abstract.

I tried changing it to ResourceGroupListenerPtr and ogre.ResourceGroupListenerPointer and even doing

def __init__(self):
self.__class__ = ogre.ResourceGroupListenerPointer


But nothing works. Any ideas?

When you create a subclass for a python callback (director) you need to add a call to the constructor of the parent class:
class VWResourceListener(ogre.ResourceGroupListener):
def __init__(self):
ogre.ResourceGroupListener.__init__(self)

def resourceLoadStarted(*args):
"""resourceLoadStarted(self, ResourcePtr resource)"""
for x in args:
print x


I'm not sure if this will fix all of your problems. I have not fully looked over your code, but start here.

*Cough* Actually no, you don't need that. Python always call __init__ on the new object but resolve it using the normal inheritance rules (remember: everything in Python is virtual) so if __init__ does not exists the one from the parent class is called.

I suppose the problem is that we didn't enabled directors for that class. I have the change made but I can't access berlios SVN right now. I'll commit a little bit later.

Thanks, I'll try it when I get home.

*Cough* Actually no, you don't need that. Python always call __init__ on the new object but resolve it using the normal inheritance rules (remember: everything in Python is virtual) so if __init__ does not exists the one from the parent class is called.

I suppose the problem is that we didn't enabled directors for that class. I have the change made but I can't access berlios SVN right now. I'll commit a little bit later.
Whoops. Glad fog is around. =)

I commited the change right now but I didn't have the tine to write some code to check it. @srekel, Please tell us if it worked or I'll try something in Shy in the next few days.

Cool, I'll try to look at it right away. Thanks.



EDIT:

It now crashes while doing


ogre.ResourceGroupManager.getSingleton().loadResourceGroup("General")


Here's everything I do (resource initializing is done before this):

resListener = VWResourceListener()
print type(resListener)
print 123
ogre.ResourceGroupManager.getSingleton().addResourceGroupListener(resListener)
print 234

ogre.ResourceGroupManager.getSingleton().loadResourceGroup("General")


This is the listener:




class VWResourceListener(ogre.ResourceGroupListener):
"""
>>> dir(ogre.ResourceGroupListener)
['__class__', '__del__', '__delattr__', '__dict__', '__doc__', '__getattribute__
', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__
', '__repr__', '__setattr__', '__str__', '__weakref__', 'resourceGroupLoadEnded'
, 'resourceGroupLoadStarted', 'resourceGroupScriptingEnded', 'resourceGroupScrip
tingStarted', 'resourceLoadEnded', 'resourceLoadStarted', 'scriptParseEnded', 's
criptParseStarted', 'worldGeometryStageEnded', 'worldGeometryStageStarted']
"""

def resourceGroupScriptingStarted(*args):
print 1
"""resourceGroupScriptingStarted(self, String groupName, size_t scriptCount)"""
return _ogre.ResourceGroupListener_resourceGroupScriptingStarted(*args)

def scriptParseStarted(*args):
print 1
"""scriptParseStarted(self, String scriptName)"""
return _ogre.ResourceGroupListener_scriptParseStarted(*args)

def scriptParseEnded(*args):
print 1
"""scriptParseEnded(self)"""
return _ogre.ResourceGroupListener_scriptParseEnded(*args)

def resourceGroupScriptingEnded(*args):
print 1
"""resourceGroupScriptingEnded(self, String groupName)"""
return _ogre.ResourceGroupListener_resourceGroupScriptingEnded(*args)

def resourceGroupLoadStarted(*args):
print 1
"""resourceGroupLoadStarted(self, String groupName, size_t resourceCount)"""
return _ogre.ResourceGroupListener_resourceGroupLoadStarted(*args)

def resourceLoadStarted(*args):
print 1
"""resourceLoadStarted(self, ResourcePtr resource)"""
print "RESLOADSTART"
for x in args:
print x
return _ogre.ResourceGroupListener_resourceLoadStarted(*args)

def resourceLoadEnded(*args):
print 1
"""resourceLoadEnded(self)"""
return _ogre.ResourceGroupListener_resourceLoadEnded(*args)

def worldGeometryStageStarted(*args):
print 1
"""worldGeometryStageStarted(self, String description)"""
return _ogre.ResourceGroupListener_worldGeometryStageStarted(*args)

def worldGeometryStageEnded(*args):
print 1
"""worldGeometryStageEnded(self)"""
return _ogre.ResourceGroupListener_worldGeometryStageEnded(*args)

def resourceGroupLoadEnded(*args):
print 1
"""resourceGroupLoadEnded(self, String groupName)"""
return _ogre.ResourceGroupListener_resourceGroupLoadEnded(*args)




That may very well not be how it should be written, but I guess at least one "1" should get printed before the crash, but nope.

Oh, and the "print type(resListener)" prints out this:

<class 'MenuListener.VWResourceListener'>

which looks a bit strange to me. Oh, wait. MenuListener is the class I'm writing the code in, duh!

I'll add a resource loading progress bar to Shy later today and then enter debug mode. If I don't report back in 24h feel free to push me with a bbq fork.

Sorry, latecomer here. What's Shy? =)

Eh eh eh. I have to admit that I was counting the number of times I could drop a reference to it before Clay would ask.

Shy is a little "ogre material manager" of mine that I am using to test PyOgre. A video and a couple of screenshots are available from my blog and the code is available from init.org SVN. In short:

1. 
   http://initd.org/svn/initd/shy/ (SVN repository)
   http://initd.org/blog/fog/static/Shy3.png (image)
   http://initd.org/blog/fog/static/Shy1.png (image)
   http://initd.org/blog/fog/static/Shy-lightning.html (flash, about 8.3Mb)
   [/list:u]
   I sweared I would post something to the main forum only after getting texture units to work but this is not the main forum.. And texture units are quite there, anyway.

That's great. Nice work. =)

/me prods fog


..and goes to bed. night!

He's working on it. I think it might have been more troublesome than he first thought. =)

I returned yesterday night from the SMAU, the biggest ITC fair here in Italy. I am working on this.

I returned yesterday night from the SMAU, the biggest ITC fair here in Italy. I am working on this.

Any update on this? I've looked in the changelog but didn't find much since the 18th.

I too was having a problem with the ResourceGroupListener. It seems if you make a local reference:


def _createResourceListener(self):
resourceGroupListener = ResourceGroupListener()
ogre.ResourceGroupManager.getSingleton().addResourceGroupListener(resourceGroupListener)


It fails. I suppose the reference goes away quickly. Instead, make it a property:


def _createResourceListener(self):
self.resourceGroupListener = ResourceGroupListener()
ogre.ResourceGroupManager.getSingleton().addResourceGroupListener(self.resourceGroupListener)


And it works.