At first glance, I'd say there's no need for the "dssCatalog = IDSSCatalog(db)"
line which doesn't work because you're attempting to instantiate an interface.
That is, if DSSDatabase truly implements IDSSCatalog; just call
"db.MakeNewCatalog('')".
Dave
From: [email protected]
[mailto:[email protected]] On Behalf Of Max Barry
Sent: Monday, May 04, 2009 7:28 AM
To: [email protected]
Subject: [IronPython] Getting type error when calling a .NET DLL interface.
Hi all,
I am trying to call an interface from DLL created in .Net to work with a
IronPython script and am getting the following error when I run the code:
TypeError: Cannot create instances of IDSSCatalog
The trace is below:
Traceback (most recent call last):
File ".\Tutorial\ShiftIntervalMaxValue.py", line 82, in RunApp Process()
File ".\Tutorial\ShiftIntervalMaxValue.py", line 97, in Process dictgages =
GetCatalogDictFromDSSRS(db,DSS_RS_FILTER)
File ".\Tutorial\ShiftIntervalMaxValue.py", line 176, in
GetCatalogDictFromDSS RS ds = CatalogAsDataSet(db)
File ".\Tutorial\ShiftIntervalMaxValue.py", line 198, in CatalogAsDataSet
dssCatalog = IDSSCatalog(db)
TypeError: Cannot create instances of IDSSCatalog
Below is an example of the code that created the error:
import clr
def LoadTSMNet():
import string,sys
from os import path
#from System.Reflection import Assembly #Import .Net Assembly to
import DLL
mypath = path.dirname(sys.argv[0])
tsmpath = path.join(mypath,"TimeSeriesMgrNet.dll")
tsmpath = string.replace(tsmpath,'\\','\\\\')
clr.AddReferenceToFileAndPath(tsmpath)
#Assembly.LoadFile(tsmpath)
LoadTSMNet()
clr.AddReferenceByPartialName("TimeSeriesMgrNet")
import TimeSeriesMgrNet
from TimeSeriesMgrNet import IDSSCatalog, DSSDatabase
DSS_DATABASE_PATH = "C:/temp/myfile.dss"
db = DSSDatabase()
db.Name = DSS_DATABASE_PATH
db.Connect(False)
dssCatalog = IDSSCatalog(db)
dssCatalog.MakeNewCatalog('')
ds = dssCatalog.AsDataSet(True,'')
db.Disconnect()
IDSSCatalog is the interface and DSSDatabase implements the interface. Any
ideas on why I am getting this error?
Thanks,
Max
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