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I have added Wolfram.NETLink to a C# .NET Framework 4.6.1 application via NuGet. NuGet installs this to the C:\Users\[user]\.nuget\packages\wolfram.netlink\1.7.1 folder.

I have a C# application and am trying to execute the following code:

   try 
   {
       string[] mlArgs = { "-linkmode", "launch", "-linkname", "C:/Program Files/Wolfram Research/Wolfram Engine/13.1/wolfram.exe" };
       kernelLink = MathLinkFactory.CreateKernelLink(mlArgs);
       kernelLink.WaitAndDiscardAnswer();
   }
   catch(MathLinkException mlEx)
   {
       engineStatus = mlEx.Message;
   }

The call to kernelLink = MathLinkFactory.CreaterKernelLink(mlArgs); throws an exception:

"Unable to load DLL 'ml32i4.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)"}   System.Exception {System.DllNotFoundException}

What I have tried so far:

  1. Copied Wolfram.NETLink.DLL and ml32i4.dll to the same folder as the application executable. This has no effect.
  2. Set a reference path to the same folder. This has no effect.

Questions

  1. Are there additional dependencies required by Wolfram.NETLink.DLL and ml32i4.dll?

No

  1. NuGet added a reference to the project for the Wolfram.NETLink assembly. Do I need to manually add a reference to the project for ml32i4.dll?

No

Solution

  1. Add the output directory folder specification to the machine %PATH% environmental variable.
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  • $\begingroup$ The 32 in ml32i4.dll means 32-bit. Are you targeting your app for 64 bit? MS docs page $\endgroup$
    – ihojnicki
    Oct 27, 2022 at 17:04
  • $\begingroup$ 32-bit in this case. $\endgroup$ Oct 27, 2022 at 17:53

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