Active X DLL tips?
Roger at see.my.sig
Sun Oct 17 23:54:13 CEST 2004
I want to use and Active X DLL in Python applications. I have the
win32all stuff installed and the "Excel.Application" example in the
Client QuickStart section of the manual works OK, so I guess it is
Problem comes when I want to use the objects in the OPCDA library. In VB
I would include the library in the references and could then do
Dim foo as OPCServer
dim baa as OPCGroups
(lots of lower level objects omitted)
set foo=New OPCServer
foo.Connect <Server details>
set baa=foo <Call for getting a new OPCGroups object>
(code continues in a similar manner)
Leading on from the Excel example, I have tried using client.Dispatch
with "OPCServer", "OPCAutomation.OPCServer" and a few other
combinations, but I cannot get a valid object. Either I am told the
string is invalid, or I get no error but the variable which the object
was supposed to be assigned to is.....not assigned.
Maybe (as warned in the docs) the COM browser is not correctly reporting
the names I should use. It mentions the VC COM browser, but if you don't
have that are there other valid alternatives?
I have looked at the gencache functions for generating a Python module
from the type library, but I am not sure about the parameters, in
particular, what should the lcid be? Also, what is the correct way to
pass an IID, as a string complete with the hyphens?
I have looked around for examples but all I have found so far is either
accessing applications such as Excel, IE and outlook, or building
clients to test servers that have been created with Python.
I suspect that maybe I sould be doing things a bit differently to access
a vanilla Automation DLL.
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