Set properties of a COM-server that take an argument

Hi,

I started to work with a COM-server, which provides some custom simulation capabilities. In principle, the underlying program has a GUI but for some tasks, using it is relatively laborious. Therefore, I want to operate it through MATLAB.

For the simulation routine, I have to change some predefined properties to new values. Most of them can be easily changed with for example:

COMServ=actxserver('server.name');
set(COMServ,"tolerance",1.0e-05)% or COMServ.tolerance=1.0e-05; etc.

But some of the properties e.g. 'fit_parameter_value' take an argument and are therfore handled in MATLAB as methods. For example, in fit_parameter_value(k) multiple parameters are stored (k=1,2,3...). Reading them is no issue as several alternatives work:

COMServ.fit_parameter_value(k);
fit_parameter_value(COMServ,k);
invoke(COMServ,'fit_parameter_value',k)

But I am unfortunately not able to set new values (maybe because I am using the wrong syntax). Neither of the following seems to work for me:

COMServ.fit_parameter_value(k)=newValue; %Unrecognized property 'fit_parameter_value' for class 'COM.server_name'.
fit_parameter_value(COMServ,k)=newValue; %Unable to use a value of type COM.server_name as an index.
invoke(COMServ,'fit_parameter_value',k)=newValue;%Unable to use a value of type COM.server_name as an index.

What would be the correct way to set these properties?

Thank you.

Answer 1

[Adeline]

You can change the property values by assigning the existing values to a handle and updating the property values through it.

For Example:

COMServ = actxserver('Matlab.Application'); % Create a server

ch = COMServ.interfaces; % Create a handle for the re. property

ch(1) = {'IMLApp'}; % Assign a value of choice to the property

In your case the following syntax can be followed:

MyHandle = COMServ.fit_parameter_value;

MyHandle(k) = newValue;

[Stefan]

Hi,

Unfortunately, already creating the handle does not work as input parameters are still expected:

MyHandle = COMServ.fit_parameter_value;

--> Incorrect number or types of inputs or outputs for function 'fit_parameter_value'.

I contacted Mathworks Support regarding this issue a few days ago and it seems that it is not possible to set this due to COM limitations. They suggested using a .NET interface if possible.