BepInEx/BepInEx.IL2CPP/Logging/IL2CPPLogSource.cs

using System;
using System.Runtime.InteropServices;
using BepInEx.Logging;

namespace BepInEx.IL2CPP.Logging
{
    public class IL2CPPLogSource : ILogSource
    {
        public IL2CPPLogSource()
        {
            var loggerPointer = Marshal.GetFunctionPointerForDelegate(new IL2CPPLogCallbackDelegate(IL2CPPLogCallback));
            UnhollowerBaseLib.IL2CPP.il2cpp_register_log_callback(loggerPointer);
        }

        public string SourceName { get; } = "IL2CPP";
        public event EventHandler<LogEventArgs> LogEvent;

        public void Dispose() { }

        private void IL2CPPLogCallback(string message) =>
            LogEvent?.Invoke(this, new LogEventArgs(message.Trim(), LogLevel.Message, this));

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate void IL2CPPLogCallbackDelegate([In] [MarshalAs(UnmanagedType.LPStr)] string message);
    }
}