Why can I not access some COM objects in Matlab that are available from a VB script?

I have a VB script which sucessfully accesses objects and methods in Vector CANalyzer - the gist of the code is:

Set App = CreateObject("CANalyzer.Application")
App.Open (PathConfig & "Easy.cfg")
Set Logging = App.Configuration.OnlineSetup.LoggingCollection(1)
Set Exporter = Logging.Exporter
With Exporter.Sources
    .Clear
    .Add (src_file)
  End With
Exporter.Load
Exporter.Save True

But when I try the same operation in Matlab, I don't seem to be able to access the 'Exporter' object - I can only get as far as the

'LoggingCollection' object, which I can call methods from.

app = actxserver('CANalyzer.Application');
logging = app.Application.Configuration.OnlineSetup.LoggingCollection;
invoke(logging)

test = Add(logging);
Quit(app);
delete(app);

I've tried following the advice on this thread, trying to access objects and methods even though they're not visible, but this doesn't work either. i.e.

testValue = get(app.Application.Configuration.OnlineSetup.LoggingCollection.Logging, 'FullName');

Returns error: 'No appropriate method, property or field Logging for class Interface.413... etc...

Am I setting up the COM server incorrectly, or is this a peculiarity of the program I'm accessing? Is there any way to solve this problem?

Many thanks,

Tom

Answer 1

[Tom Hillman]

I've managed to sort this out - the problem was that the LoggingCollection object technically was a group of objects, even though there was only one of them. Using an invoke command to return the handle of item 1 in this group seems to work.

The code below uses Canalyzer to convert .asc files to .mat files...

% This script allows matlab to control the conversion of Canalyzer .asc files to matlab .mat files

%Opens COM server - best to already have Canalyzer running with the correct configuration open
app = actxserver('CANalyzer.Application');

Get handle of logging collection object

logging = app.Application.Configuration.OnlineSetup.LoggingCollection;

% Select first logging block
export1 = invoke(logging, 'Item', 1);

% clear sources and write new source
invoke(export1.exporter.sources, 'Clear');
invoke(export1.exporter.sources, 'Add', 'C:\test.ASC');

% clear destinations and write new destination
invoke(export1.exporter.destinations, 'Clear');
invoke(export1.exporter.destinations, 'Add', 'C:\test.mat');
invoke(export1.exporter,'Load')
invoke(export1.exporter,'Save','True')