Hi,
I wrote some code to control CST a couple of years ago. It was quite
difficult to interface via COM, since some commands simply refused to
work. What I did in the end was to as few com-calls as possible and did
the rest in VB. Even if VB is a terrible language the end result was
more stable.
Among other things I wrote code to remotely create matching networks in
the Schematics (DS canvas). Then I created a class in Python to generate
VB code on the fly, saved it as a VB-file and used the
DS.RunScript(path) command to get CST to generate the network. This
worked well.
One more thing: I found that I had to use the DS._FlagAsMethod before I
used the actual command. I.e I had to do:
DS._FlagAsMethod("RunScript")
DS.RunScript(script_file_name)
That helped to get many commands to work - but not all.
BR,
Max
On 2017-04-24 21:12, gowri shankar wrote:
Dear all,
I want to control a commercial numerical solver CST
through python. Usually, CST can be controlled using MATLAB. CST
accepts both COM and VBA macros from MATLAB. As VBA is difficult and
time consuming to program, i was successful in connecting the CST
through COM interface from MATLAB. The sample snapshot of the commands
are as below:
***********************************************************************
/ cst = actxserver('CSTStudio.application') % to open the CST/
/mws=cst.OpenFile('D:\Gowrishankar\PDF\cuboid.cst'); %to open a
particular file/
/ a=20;/
/ b=20;/
/ c=72;/
/ %To store the parameters/
/ mws.invoke('StoreParameter','a',a); %These are the COM interface
commands from MATLAB to CST/
/ mws.invoke('StoreParameter','b',b);/
/ mws.invoke('StoreParameter','c',c);/
/ %To rebuild /
/ invoke(mws,'Rebuild');/
/
/
/ %%Setting only the required boudnary conditions only/
/ bound=invoke(mws,'Boundary'); %These are the COM interface
commands from MATLAB to CST/
/ bound.invoke('Zmin','magnetic');/
/ bound.invoke('Zmax','magnetic');/
/
/
/ %% Set the frequency range/
/ solver=invoke(mws,'Solver');/
/ invoke(solver,'FrequencyRange',freMin,freMax);/
/
/
/ Esolver=invoke(mws,'EigenmodeSolver');/
/ invoke(Esolver,'Reset');/
/ invoke(Esolver,'SetMeshType','Tetrahedral Mesh');
/
/ invoke(Esolver,'SetNumberOfModes',noOfMode);/
/ invoke(Esolver,'Start'); %Run the solver
/
/noOfModesCalculated=invoke(Esolver,'GetNumberOfModesCalculated');/
/ for j=1:noOfModesCalculated/
/eigenFreq(j)=invoke(Esolver,'GetModeFrequencyInHz',j);/
/ end/
/
/
/ invoke(mws,'Save'); %Save the file/
/ invoke(mws, 'Quit'); %closes the file/
/ release(mws); /
/ invoke(cst, 'Quit'); % closes the CST application/
/ release(cst);/
/ dos(['taskkill /F /IM ' '"CST DESIGN ENVIRONMENT.exe"']);/
**************************************************************************
MATLAB commands work perfectly wihtout any fuss.
*I have translated the above code in python but i was able to talk to
CST with only first 2-3 commands i.e*
*********************************
/import win32com.client/
/cst = win32com.client.Dispatch("CSTStudio.Application")/
/#Opens a new CST file/
/mws=cst.OpenFile('D:\Gowrishankar\PDF\cuboid.cst');/
/
/
/#mws=cst.NewMWS()/
/
/
/###*Below this commands i got error or sometimes it didn't give any
error but just it didn't worked*/
/mws.StoreParameter('len2',10.1)/
/mwssolver=mws.Solver()/
/mws.Solver.Start()/
*******************************
I tried different online forums for help and i was unsuccessful in
getting any clue how to move forward. Erros messages didnt revealed
any information. I even checked and compared the COM commands used to
control Excel from MATLAB and Python. But, still i am not able to
progress any further. Moreover, the commercial software guys wont help
me in doing with python. Furthermore, i used combrowse.py and make.py
to access the different objects of the interface but they are all
hidden for CST. Can someone suggest me how should i move ahead, are
there any examples available for controlling a windows application
through MATLAB and python so that i can understand the co-relation
between the commands between the two. Any help in this regard is
highly appreciated.
Regards,
GOWRISHANKAR.T.H
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