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This tutorial gives a description of one way of accessing C# from Visual Prolog.

We make the C# library COM visible and then we import the COM component in Visual Prolog.

Notice that COM is only supported by the '''Commercial Edition''' of Visual Prolog: see [http://www.visual-prolog.com/vip6/product/vipPE2CE.htm Visual Prolog Editions Comparison].

=== Creating a C# COM component in Visual Studio ===

# Create a C# project. I just created one that was a class library.
# Open the project properties. Open the assembly information. Select ‘Make Assembly Com-Visible’.
# Make an interface that expose the functions you want to call and a class that implements that interface.


For the interface set the attributes InterfaceType ot InterfaceIsIUnknown and a GuidAttribute to some GUID (generated by tools\Create GUID in VS)

<source lang="csharp">
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
GuidAttribute("0828DB14-1275-3926-813D-494F4FE771CF")]
public interface IMyInterface
{
    string MyFunction(string Input);
}
</source>

The ClassInterface should be None and here should also be a GuidAttribute.

<source lang="csharp">
[ClassInterface(ClassInterfaceType.None),
GuidAttribute("95E62F78-55FF-4061-8238-6D3FCF88F5D0")]
public class MyClass : IMyInterface
{
     …
}
</source>

Remember to add:

<source lang="csharp">
using System.Runtime.InteropServices;
</source>

Compile the program.

=== Importing the COM component in Visual Prolog ===

Copy assembly dll to your prolog projects exe folder.

If it has to be placed somewhere else there is some work with the registration which have to use /codebase, currently we expect it to be placed in the exe folder

Run tlbexp.exe on the dll to get a xxx.tbl file tlpexp.exe comes together with the windows SDK.

Register the dll using regasm.exe (this has to be done every time the program have to run on a new machine).

Import the COM component into the Visual Prolog project.
Select 'New in new package' in the project tree. Give the package a name and select COM package load the type library (that is the tlb file). 

Now the program should be able to run.

=== See also ===

* [http://msdn.microsoft.com/en-us/library/zsfww439.aspx Exposing .NET Framework Components to COM]

[[Category:Interfacing other programming languages]]

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