How can I find out what the default MATLAB COM Automation Server is when I have different versions installed?

I have multiple versions of MATLAB installed on my system. I would like to interface with MATLAB through the COM Automation Server interface. Is there a way to determine what version is being called by default?

Answer 1

[MathWorks Support Team]

The following code will determine what the default server is and if the MATLAB executable that is specified in it exists or not:

function getmatlabdefaultserver()

getdefaultserver('MATLAB.Application');

function getdefaultserver(serverApplication)

if ~exist('serverApplication', 'var')

error('Please specify a server application');

end

try

      % Get registry keys.

      serverAppCLSID = winqueryreg('HKEY_CLASSES_ROOT', [serverApplication '\CLSID\']);

      progId = winqueryreg('HKEY_CLASSES_ROOT', ['CLSID\' serverAppCLSID '\']);

      localServer32 = winqueryreg('HKEY_CLASSES_ROOT', ['CLSID\' serverAppCLSID '\LocalServer32\']);

      disp(['The default Automation Server for "' serverApplication '" on this machine is:'])

      disp(['ProgId: ' progId]);

      disp(['LocalServer32: ' localServer32]);

      disp(['CLSID: ' serverAppCLSID]);

      % Parse server application's path.

      serverAppPath = regexpi(localServer32, '.*\.exe', 'match', 'once');

      serverAppPath = strrep(serverAppPath, '"', ''); % Remove ".

      % Check if executable exists.

      if ~isempty(serverAppPath)

          if exist(serverAppPath, 'file')

              disp(['File exists: ''' serverAppPath '''']);

          else

              warning(['File does not exist: ' serverAppPath]);

          end

      end

catch

      disp('There was an error while reading the registry.');

end

To register a certain MATLAB version as the default server, execute the following command in the MATLAB Command Window of your desired version, as specified in the related solution 1-3ZJXQR:

!matlab -regserver