Interface with C#, Visual Studio 2010 Express

Hello,

I am trying to send data to MATLAB through C# and am getting the " No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE))." exception. Full code and error posted below.

I am using the examples that I found on this site: <http://www.mathworks.com/support/solutions/en/data/1-SJ9GS/?product=ML&solution=1-SJ9GS>

As shown, I add a reference (in my COM tab the only reference I find is "Matlab Application (Version 7.0) Type Library") and compile the project.

Basically upon running the code instantiates an MLAppClass object. This works fine, I see a Matlab Command window open up. But if I try to send data to the object, i.e. using even a basic ml.Execute("1+2"); or even ml.Quit(); and I get the error.

There was a post suggesting a registry key was wrong, but it didn't seem to help. I am running Matlab 7.0 and Visual Studio 2010.

Any suggestions? Thanks.

namespace cSharpCallsMATLAB

{

  public class Form1 : System.Windows.Forms.Form

  {

    private MLApp.MLAppClass ml;

    public Form1()

    {

      InitializeComponent();

      ml = new MLApp.MLAppClass();

    }

    /// 

    /// The main entry point for the application.

    /// 

    [STAThread]

    static void Main() 

    {

      Application.Run(new Form1());

    }

    private void onButtonClick(object sender, System.EventArgs e)

    {

      resultBox.AppendText(ml.Execute("1+2") );

    }

  }

}

The exception is:

Unable to cast COM object of type 'System.__ComObject' to interface type 'MLApp.MLApp'. 
This operation failed because the QueryInterface call on the COM component for the interface with IID '{669CEC93-6E22-11CF-A4D6-00A024583C19}' failed due to the following error: 
No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

Answer 1

[Walter Roberson]

You might have to (once) start up matlab from cmd and start it up with the /regserver flag, in order to register the automation server.

[William]

Appreciate the quick response but unfortunately this is not the problem. I ran

C:\Program Files\MATLAB71\bin\win32>MATLAB.exe /regserver

and got the same result.

I found the other post where someone had the same problem, a responder said the GUID was messed up and needed to be changed, I cannot find much more about it:

http://www.mathworks.com/matlabcentral/newsreader/view_thread/99105

Anyone else trying Matlab 7.0 with Visual Studio, or anyone familiar with newer versions of Matlab working?