.NET Assembly dll in C# with error "Not enough input arguments"

I am trying to get a simple .NET assembly working before I tackle the real thing. I am either getting "Not enough input arguments" and other times, "Not enough output arguments".

I have made sure that I have the matching MWArray.dll on my c# development computer.

MWArray and my Matlab created dll (TestAddCompiled.dll) have been referenced

I have left the commented out attempts I have made.

In the Matlab console: nargin is 3, nargout is 1

MATLAB R2019a, C# Visual Studio 2015

Matlab code:

function [c] =  TestAdd(a,b,iAdd)
    % Helper function used in testing type safe API.
    %if ~isnumeric(a) || ~isnumeric(b)
    %    error('Input must be numeric. Input was %s and %s.', class(a), class(b));
    %end
    
    switch iAdd
        case 1
            c = a + b;
        case 0
            c = Multiply(a,b);
        otherwise
            c = Multiply(a,b);
    end
%     if iAdd==1
%        c = a + b;
%     else
%        c = Multiply(a,b);
%     end
    

end

function d = Multiply(a,b)
    d = a * b;
end

Matlab library compiler:

C# Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using MathWorks.MATLAB.NET.Arrays;
using MathWorks.MATLAB.NET.Utility;

using TestAddCompiled;

namespace TestAddC
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //initialize instance of Matlab class
            clsAdd clsMyAdd = new clsAdd();

            //Dead Code
            /*MWNumericArray dFirst = new MWNumericArray(new Int64());
            MWNumericArray dSecond = new MWNumericArray(new Int64());
            MWNumericArray dThird = new MWNumericArray(new Int64());

            dFirst = Convert.ToInt64(5);
            dSecond = Convert.ToInt64(5);
            dThird = Convert.ToInt64(5);*/
            //End Dead Code

            //Create array of inputs
            Int64[] dArrInput = { 5,6,1 };    //also tried Int32 and double
            MWArray[] dArrOutput = null;

            //dArrOutput = 0;
            // MWNumericArray mlArrInput = new MWNumericArray(dArrInput);

            //Create and convert inputs to MWNumericArray
            MWNumericArray inputs = null;
            inputs = new MWNumericArray(1, 3, dArrInput);

            MessageBox.Show("Inputs: " + inputs.ToString());

            //double dOutput = 0;
            //dArrOutput = clsMyAdd.TestAdd(1, dFirst, dSecond, dThird);
            //dArrOutput = clsMyAdd.TestAdd(1, mlArrInput);
            //dOutput = clsMyAdd.TestAdd(5,6,1);
            //dArrOutput[0] = clsMyAdd.TestAdd(5, 6, 1);
            //dArrOutput = clsMyAdd.TestAdd(1, 3, mlArrInput);    //#output, #input, array
            //dArrOutput = clsMyAdd.TestAdd(1, mlArrInput);    //0 based #output, #input, array

            dArrOutput = clsMyAdd.TestAdd(1, inputs);   //1 output, inputs

           
        }
    }
}

Error:

System.Exception was unhandled

HResult=-2146233088

Message=

... MWMCR::EvaluateFunction error ...

Not enough input arguments.

Error in => TestAdd.m at line 8.

... Matlab M-code Stack Trace ...

at

file C:\Users\cbonneau\AppData\Local\Temp\cbonneau\mcrCache9.6\TestAd3\TestAddCompi\TestAdd.m, name TestAdd, line 8.

Source=MWArray

StackTrace:

at MathWorks.MATLAB.NET.Utility.MWMCR.EvaluateFunction(String functionName, Int32 numArgsOut, Int32 numArgsIn, MWArray[] argsIn)

at MathWorks.MATLAB.NET.Utility.MWMCR.EvaluateFunction(Int32 numArgsOut, String functionName, MWArray[] argsIn)

at TestAddC.Form1.button1_Click(Object sender, EventArgs e) in C:\TestFolder\TestAddC\TestAddC\Form1.cs:line 61

at System.Windows.Forms.Control.OnClick(EventArgs e)

at System.Windows.Forms.Button.OnClick(EventArgs e)

at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)

at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ButtonBase.WndProc(Message& m)

at System.Windows.Forms.Button.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)

at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)

at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)

at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)

at TestAddC.Program.Main() in C:\TestFolder\TestAddC\TestAddC\Program.cs:line 19

at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)

at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)

at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()

at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

at System.Threading.ThreadHelper.ThreadStart()

InnerException:

Answer 1

[Kojiro Saito]

Since your TestAdd function requires three input arguments and your inputs in C# is one array, you need to put each input separately.

Please replace the last code (dArrOutput=...) in C# to the following.

dArrOutput = clsMyAdd.TestAdd(1, inputs[1], inputs[2], inputs[3]);   //1 output, inputs
MessageBox.Show("Outputs: " + dArrOutput[0].ToString());

[Vlad Semiga]

Thank you!! So simple.