hello!
I am working on a component that adaptively adds and removes input parameters depending on an initial input. When I call UnregisterInputParameter() on a connected param, even with with the isolate bool set to True, I get an object expired during solution error in a popup. The dynamic registering and unregistering of inputs is otherwise working fine. I tried using the IGH_Param.IsolateObject() method to disconnect the param before unregistering, but that didn’t work. The component takes a custom class with an input_names attribute which looks like this:
class input(object):
def __init__(self):
self.input_names = ["input 1", "input 2"]
a = input()
or
class input(object):
def __init__(self):
self.input_names = ["input 3", "input 4"]
a = input()
Here is the component script itself:
from ghpythonlib.componentbase import executingcomponent as component
from Grasshopper.Kernel.GH_RuntimeMessageLevel import Error
from Grasshopper.Kernel.GH_RuntimeMessageLevel import Warning
import Grasshopper
doc = Grasshopper.Instances.ActiveCanvas.Document
def add_GH_param(name, io, ghenv):
"""Adds a parameter to the Grasshopper component. """
assert io in ("Output", "Input")
params = [param.NickName for param in getattr(ghenv.Component.Params, io)]
if name not in params:
param = Grasshopper.Kernel.Parameters.Param_GenericObject()
param.NickName = name
param.Name = name
param.Description = name
param.Access = Grasshopper.Kernel.GH_ParamAccess.item
param.Optional = True
index = getattr(ghenv.Component.Params, io).Count
registers = dict(Input="RegisterInputParam", Output="RegisterOutputParam")
getattr(ghenv.Component.Params, registers[io])(param, index)
def clear_GH_params(ghenv, permanent_param_count=1):
"""Clears all input parameters from the component. """
changed = False
while len(ghenv.Component.Params.Input) > permanent_param_count:
ghenv.Component.Params.Input[len(ghenv.Component.Params.Input) - 1].IsolateObject()
ghenv.Component.Params.UnregisterInputParameter(
ghenv.Component.Params.Input[len(ghenv.Component.Params.Input) - 1],
True
)
changed = True
ghenv.Component.Params.OnParametersChanged()
return changed
def manage_dynamic_params(input_names, ghenv, permanent_param_count=1):
"""manages component input parameters. """
if not input_names: # if no names are input
return clear_GH_params(ghenv, permanent_param_count)
else:
register_params = False
if len(ghenv.Component.Params.Input) == len(input_names) + permanent_param_count: #if param count matches input_names count
for i, name in enumerate(input_names):
if ghenv.Component.Params.Input[i + permanent_param_count].Name != name: #if param names don't match
register_params = True
break
else:
register_params = True
if register_params:
clear_GH_params(ghenv, permanent_param_count) #we could consider renaming params if we don't want to disconnect GH component inputs
for name in input_names:
add_GH_param(name, "Input", ghenv)
return True
else:
return False
class DirectJointRule(component):
def RunScript(self, original_input, *args):
names = None
if original_input:
names = [name for name in original_input.input_names]
if manage_dynamic_params(names, ghenv):
ghenv.Component.Params.OnParametersChanged()
doc.ScheduleSolution(1)
return
return args
I tried a bunch of different things like ScheduleSolution(), ExpireSolution(), etc, but havent got this error to go away. If i click “do not show message again” then the component acts as I want it to.
Any help would be greatly appreciated!
Thanks
