Interop.cs

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using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
 
internal static class Interop
{
    internal enum BOOL
    {
        FALSE,
        TRUE
    }
 
    internal static class Kernel32
    {
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct CPINFOEXW
        {
            internal uint MaxCharSize;
 
            internal unsafe fixed byte DefaultChar[2];
 
            internal unsafe fixed byte LeadByte[12];
 
            internal char UnicodeDefaultChar;
 
            internal uint CodePage;
 
            internal unsafe fixed char CodePageName[260];
        }
 
        [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
        private unsafe static extern BOOL GetCPInfoExW(uint CodePage, uint dwFlags, CPINFOEXW* lpCPInfoEx);
 
        internal unsafe static bool TryGetACPCodePage(out int codePage)
        {
            Unsafe.SkipInit(out CPINFOEXW cPINFOEXW);
            if (GetCPInfoExW(0u, 0u, &cPINFOEXW) != 0)
            {
                codePage = (int)cPINFOEXW.CodePage;
                return true;
            }
            codePage = 0;
            return false;
        }
    }
}