Error adding "CookComplete" event handler
June 19, 2020 1:05 p.m.
Hi,
I just upgraded from H18.0.416 to H18.0.460 and started getting errors on the event handler for “pdg.EventType.CookComplete”. The code inside the event is selecting the first workitem, like this:
myNode . setSelectedWorkItem ( event . node . workItems [ 0 ] . id )
…and the error message:
Error running Python callback 'Event Handler' :
Traceback ( most recent call last ):
File "C:/PROGRA~1/SIDEEF~1/HOUDIN~1.460/houdini/python2.7libs\hou.py" , line 63874 , in setSelectedWorkItem
return _hou . TopNode_setSelectedWorkItem ( * args )
Error : This function can only be called from the main thread
What is the recommended way to avoid this ?
Thanks.
Edited by fabriciochamon - June 19, 2020 13:15:55
June 22, 2020 12:02 p.m.
Looking at the changelog, this is probably the result of this:
Houdini 18.0.454 Added checks to several hou.TopNode functions to prevent access off of main thread. Fri. May 1, 2020 I'm trying to use the hdefereval module without success. Code:
import pdg
import hdefereval
node = hou . node ( '/obj/topnet1/test' )
pdgNode = node . getPDGNode ()
def onFinished ( event ):
hdefereval . executeDeferred ( node . setSelectedWorkItem ( event . node . workItems [ 0 ] . id ))
pdgNode . removeAllEventHandlers ()
pdgNode . addEventHandler ( onFinished , filter = pdg . EventType . CookComplete )
So the idea is simple: I want to select the first workitem once a top node cook is complete. any hints ?
chrisgreb Member
603 posts Joined: Sept. 2016 Offline
June 22, 2020 8:30 p.m.
you need to pass executeDeferred the thing you want executed. What you're doing is executing right away. For example:
hdefereval . executeDeferred ( node . setSelectedWorkItem , event . node . workItems [ 0 ] . id )
June 22, 2020 9:09 p.m.
ah should have used help() on the module.
that works. Thank you Chris!
that works. Thank you Chris!