How to Quit MATLAB using C# & COM?

I have a C# program that invokes a new dedicated Matlab instance as follows:

Type mlt = Type.GetTypeFromProgID("Matlab.Application.Single");
MLApp.MLApp ml = (MLApp.MLApp)Activator.CreateInstance(mlt);

However, I am unable to get the Matlab instance to quit. I have tried ml.Quit();, but the instance remains running. I have also tried ml.Execute("quit");, but I get a .NET error. Is there another way or more I need to do to get Matlab to quit?

Answer 1

[Friedrich]

Hi,

Fangjun is right. It seems like you are using late binding. This makes coding a bit more complicated. Why aren't you using early binding? To do early binding add as reference to your C# projekt the COM refernce named Matlab Application (Version 7.**) Type Library. And than as code simply do:

              MLApp.MLApp ML = new MLApp.MLApp();
              ML.PutWorkspaceData("test", "base", 4);
              String output = ML.Execute("whos");
              System.Console.Write(output);
              // keep application running after some keystroke
              System.Console.Read();
              ML.Quit();

[Shawn]

The implementation I wrote is the only way I have found that I can specify a ProgID, specifically "Matlab.Application.Single". Is there a way I can specify a ProgID using your method?

[Conrad]

Hi Shawn, did you make any progress on this...having the same problem.

[Friedrich]

I created a C# project where I added the ML Type Library as reference (win 7 64bit, R2011b). I used the following code which worked fine:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace test

{

class Program

{

static void Main(string[] args)

{

Type mlt = Type.GetTypeFromProgID("Matlab.Application.Single");

MLApp.MLApp ml = (MLApp.MLApp)Activator.CreateInstance(mlt);

ml.Visible = 1;

//wait 5 seconds

System.Threading.Thread.Sleep(5000);

ml.Quit();

System.Console.WriteLine("Press any key to close this appl.");

System.Console.Read();

}

}

}

Which code do you use in order to get this behavior where you can't close MATLAB?

Answer 2

[Fangjun Jiang]

Here is what I found in the document. I couldn't test it though whether ml.Quit works or not.

ml.Quit
ml.delete

Example — Calling MATLAB from a C# Client

This example creates data in the client C# program and passes it to MATLAB. The matrix (containing complex data) is then passed back to the C# program.The reference to the MATLAB Type Library for C# is:

MLApp.MLAppClass matlab = new MLApp.MLAppClass();

Here is the complete example:

using System;
namespace ConsoleApplication4
{
class Class1
{
[STAThread]
static void Main(string[] args)
{
MLApp.MLAppClass matlab = new MLApp.MLAppClass();

System.Array pr = new double[4];
pr.SetValue(11,0);
pr.SetValue(12,1);
pr.SetValue(13,2);
pr.SetValue(14,3);

System.Array pi = new double[4];
pi.SetValue(1,0);
pi.SetValue(2,1);
pi.SetValue(3,2);
pi.SetValue(4,3);

matlab.PutFullMatrix("a", "base", pr, pi);

System.Array prresult = new double[4];
System.Array piresult = new double[4];

matlab.GetFullMatrix("a", "base", ref prresult, ref piresult);
}
}
}

[Shawn]

I get the following message when adding ml.delete:

'MLApp.MLApp' does not contain a definition for 'delete'

Answer 3

[Moe]

I use:

public static MLApp.MLApp matlab;

matlab = new MLApp.MLApp();

matlab.Execute("exit");

Answer 4

[Andrea Di Domenico]

I use this code:

try
{
    matlab.Execute("quit");
}
catch (Exception ex)
{
}

It is not so clean but it works