using System;
using System.IO;
using System.Runtime.InteropServices;

public static class SystemLibrary
{
#if UNITY_STANDALONE_WIN
    [DllImport("kernel32", EntryPoint = "LoadLibrary", SetLastError = true, CharSet = CharSet.Unicode)]
    private static extern IntPtr LoadLibraryNative(string lpFileName);

    [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool SetDllDirectory(string lpPathName);

    public static IntPtr LoadLibrary(string lpFileName)
    {
        string lpPathName = Path.GetDirectoryName(lpFileName);
        lpFileName = Path.GetFileName(lpFileName);
        SetDllDirectory(lpPathName.Replace('/', '\\'));
        return LoadLibraryNative(lpFileName);
    }

    [DllImport("kernel32", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool FreeLibrary(IntPtr hModule);

    [DllImport("kernel32")]
    public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
#endif
}