Hello,
I have some problems accessing an object.
This object is instantiated by another object.
This other object holds a reference to the object.
This reference is of type MarshalByRefObject
Obviously I cannot access the object through MarshalByRefObject.
This must be done using the 'unbound-class-instance' method (please correct
me if I am wrong)
For this method you need to instantiate the interface type object.
However the interface is abstract!
How to cope with this.
Please find sample code below;
import traceback
import clr
clr.AddReference("Bosch.Vms.SDK")
import Bosch.Vms.SDK
# RemoteServerApi constructor instantiates an object implementing a
Bosch.Vms.SDK.IEventManager
# interface
RemoteServerApi = Bosch.Vms.SDK.RemoteServerApi("xxxx", "xxxx", "xxxx")
# RemoteServerApi holds a reference to the object implementing a
Bosch.Vms.SDK.IEventManager
# interface. This reference is of type MarshalByRefObject.
print type(RemoteServerApi.EventManager)
# How to call a method of EventManager through MarshalByRefObject?
print Bosch.Vms.SDK.IEventManager.GetAllEventTypes
try:
# Try the naive approach.
RemoteServerApi.EventManager.GetAllEventTypes()
except:
# Obviously fails because MarshalByRefObject instances do not support
reflection.
# AttributeError: 'MarshalByRefObject' object has no attribute
'GetAllEventTypes'
print traceback.format_exc()
try:
# Try the 'unbound-class-instance' method
Bosch.Vms.SDK.IEventManager.GetAllEventTypes(RemoteServerApi.EventManager)
except:
# TypeError: expected IEventManager, got MarshalByRefObject
print traceback.format_exc()
try:
# Okay I need an IEventManager instance
Bosch.Vms.SDK.IEventManager(RemoteServerApi.EventManager)
except:
# TypeError: Cannot create instances of IEventManager because it is
abstract
print traceback.format_exc()
Okko Willeboordse
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