How do you use a class from a .dll file?

Questions & Answers
1

I’m trying to use a class, “DevIO”, from a Microchip library, “MCP2210-M-dotNet2.dll”. When I downloaded the library, it had a managed and unmanaged folder, but Unity is reading both of them as native plugins. Supposedly, DllImport is used to access methods from a native plugin, but how do I access a class?

UPDATE:
Previously, I did have “MCP2210-M-dotNet2.dll” in a Plugins folder. I added it to the Assets folder as suggested. I then had to manually edit the project references in MonoDevelop and browse to add it as a .Net Assembly. Now “using MCP2210” is recognized, and there are no errors in MonoDevelop, but Unity still has errors.

I read more into how to use the library, and it requires Microsoft Visual C++ 2010 Redistributable Package or the inclusion of “msvcp100.dll” and “msvcr100.dll”. However, Unity says they aren’t valid .Net Assemblies, so is there a way I can include the Microsoft Visual C++ Redistributable Package in Unity?

2

It looks like dealing with plugins is a Pro-only feature.

Now that I know more about the problem. You should be able to pull in the DLL’s from the managed directory under the “MCP2210DLL-M-dotNet2” directory. You will need all of the DLL’s under this directory inside your plugins directory.

The “MCP2210DLL-M-dotNet2.dll” and “msvcm90.dll” are both managed dlls written in c#. They will expose all the functionality from the other two dll’s (msgvcp90.dll and msvcr90.dll) to you.

There’s example documentation within the managed directory. Just open up the “MCP2210DLL-M_CSExampleCode.sln” solution. Within this solution is Program.cs which contains examples on how to use the code. All the code made available to you is under the MCP2210 namespace so your scripts will need the using MCP2210; directive. You won’t need to add the DLLs as references to your unity solution since Unity will do this step automatically (assuming you have placed them in your plugins directory).

Edit:
Once you’ve done everything above the following code in a c# script compiled just fine.

using UnityEngine;
using System.Collections;
using MCP2210;

public class MicrochipTest : MonoBehaviour
{

	// Use this for initialization
	void Start ()
    {
        //Variables
        const uint MCP2210_VID = 0x04D8;   // VID for Microchip Technology Inc.
        const uint MCP2210_PID = 0x00DE;   // PID for MCP2210
        bool isConnected = false;           // Connection status variable for MCP2210

        MCP2210.DevIO UsbSpi = new DevIO(MCP2210_VID, MCP2210_PID);
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}