ActiveX: how to pass a string array to cst in matlab？

hi, i'm using the activex interface to control cst(2019) by matlab(2018).matlab works fine as it comes to pass number and sting to cst.

However,when is comes to pass a string array, i get error:

Invalid double parameters array definition (not a valid string array).

I want to know how to pass a string array to cst in matlab.

the matlab code is:

oCSTApp = actxserver('CSTStudio.application');
oProject= oCSTApp.invoke('NewMWS');
Block = invoke(oProject,'Block');
Block.invoke('Reset')
Block.invoke('Type', 'MicrostripCoupledLinesIrregular')
Block.invoke('Name', 'MC2')
Block.invoke('SetIntegerProperty','Number Of Lines', 4)
sWidth={"0.5";"1.1";"2.2";"3.3"}
Block.invoke('SetDoubleArrayProperty','Widths', sWidth)(will get error here!)

the VBA code is ：

'Create a block

With Block
.Reset
.Type ("MicrostripCoupledLinesIrregular")
.Name ("MC2")
Dim sWidth(0 To 3) As String
sWidth(0) = "0.5"
sWidth(1) = "1.1"
sWidth(2) = "2.2"
sWidth(3) = "3.3"
.SetIntegerProperty("Number Of Lines", 4)
.SetDoubleArrayProperty("Widths", sWidth)
.Position(51050, 51000)
.Create
End With

[dpb]

Study the API doc for the application...it's not in MATLAB what the syntax should be...altho it looks peculiar to use string for sWidth. VBA will often automagically cast to the correct type silently; what happens if you use doubles instead?

[liang]

I tried to use doubles with code :

sWidth=[0.5;1.1;2.2;3.3] 

and

sWidth=[0.5,1.1,2.2,3.3]

But not work. get error:

Invalid double parameters array definition (not a valid string array).

[Johan]

Did you get this to work? I have the same problem.

[liang]

not yet.

[dpb]

I'd guess your only hope will be thru MEX and a C-style string (null terminated char() array)

What if you try a char() array that mimics such in MATLAB?

[Johan]

Still have same problem, tried all proposed options. Have you got it to work? Any other possible workarounds to try?

Answer 1

[Steven Lord]

sWidth={"0.5";"1.1";"2.2";"3.3"}

The error message is accurate in that sWidth is not a string array. It is a cell array whose cells contain string arrays. You could try passing an actual string array, though I'm not certain exactly how string interacts with COM objects.

sWidth=["0.5";"1.1";"2.2";"3.3"]

[liang]

I have already tried this and still got error:

Invalid double parameters array definition (not a valid string array).

Answer 2

[James Tursa]

Couple of things you might also try

sWidth={'0.5';'1.1';'2.2';'3.3'};

or

sWidth={'0.5';'1.1';'2.2';'3.3'};
sWidth = cellfun(@(x)[uint8(x) uint8(0)],sWidth,'uni',false);

Answer 3

[Johan]

Finally found a workaround that works, although not really a Matlab solution.

I dont think the Matlab and VBA string array variables are compatable, I have tried everything I could think of.

The solution is thus to write a VBA macro in CST. You can thus :

1. Write the parameter data to a text file from Matlab.
2. From Matlab, launch the CST macro by invoking the RunMacro command.
3. From the CST macro, read the text file to get the required parameters, and do the rest in VBA.

I can confirm that this is +-10 times faster than writing individual strings from Matlab as well.

Good luck