How to use feval matlab in c#

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i create a function in matlab called segment, and i want to call it from c# program
it takes 2 argument "string and integer"
and it returns 6 arrays
this is my code :

C#

var activationContext = Type.GetTypeFromProgID("matlab.application.single");
var matlab = (MLApp.MLApp)Activator.CreateInstance(activationContext);
matlab.Visible = 0;
string name = Openfile.FileName;
int num = 0;
var result = matlab.Feval("WBC_SegProposed", 6, name,num);

but it give me error at the last instruction, that is the error
Error 1 The best overloaded method match for 'MLApp.DIMLApp.Feval(string, int, out object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object, object)' has some invalid arguments

even this instruction give me error
a = matlab.Feval("strcat", 1, "hello", "world")
what shall i do ?

Posted 8-Jul-14 1:11am

Esraa Saady

Updated 25-Nov-19 0:02am

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Matt T Heffron · Accepted Answer · 2014-07-08T07:18:00

Solution 1

This looks like the c# wrapper around the COM interface is not returning the result as a normal return value, rather it is returning it via an out parameter. So your code would look like:

C#

object result;
matlab.Feval("WBC_SegProposed", 6, out result, name, num);

If the additional arguments were not "defaulted" then you'll need an appropriate number of null values to complete the argument list.

Disclaimer: I've used Matlab in the past but I do not have a copy currently so I cannot try this. This is my best guess.

Posted 8-Jul-14 7:18am

Matt T Heffron

Comments

Esraa Saady 8-Jul-14 15:12pm

thank you very much...the error is gone :)

Esraa Saady 8-Jul-14 15:25pm

do you have any idea how i can receive a lot of output parameters from the function in c# ??

Matt T Heffron 8-Jul-14 15:56pm

Like I stated, I don't have Matlab installed and I've never used the COM interface either. So I'm not sure.
Is the result object returned a single value, or is it an array (COM SAFEARRAY) of all of the returned values?
Just a thought.

Esraa Saady 8-Jul-14 16:20pm

thanks for answering me :) .. it works know