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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Runtime.InteropServices;
namespace NativeLibrary
{
public class Class1
{
[NativeCallable(EntryPoint = "add", CallingConvention = CallingConvention.StdCall)]
public static int Add(int a, int b)
{
return a + b;
}
[NativeCallable(EntryPoint = "write_line", CallingConvention = CallingConvention.StdCall)]
public static int WriteLine(IntPtr pString)
{
// The marshalling code is typically auto-generated by a custom tool in larger projects.
try
{
// NativeCallable methods only accept primitive arguments. The primitive arguments
// have to be marshalled manually if necessary.
string str = Marshal.PtrToStringAnsi(pString);
Console.WriteLine(str);
}
catch
{
// Exceptions escaping out of NativeCallable methods are treated as unhandled exceptions.
// The errors have to be marshalled manually if necessary.
return -1;
}
return 0;
}
}
}
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