Detect Encoding for In- and Outgoing Text

namespace MultiLanguage
{
    using System;
    using System.Runtime.CompilerServices;
    using System.Runtime.InteropServices;
    using System.Security;

    [ComImport, InterfaceType((short) 1), Guid("DCCFC164-2B38-11D2-B7EC-00C04F8F5D9A")]
    public interface IMultiLanguage2
    {
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetNumberOfCodePageInfo(out uint pcCodePage);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetCodePageInfo([In] uint uiCodePage, [In] ushort LangId, out tagMIMECPINFO pCodePageInfo);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetFamilyCodePage([In] uint uiCodePage, out uint puiFamilyCodePage);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void EnumCodePages([In] uint grfFlags, [In] ushort LangId, [MarshalAs(UnmanagedType.Interface)] out IEnumCodePage ppEnumCodePage);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetCharsetInfo([In, MarshalAs(UnmanagedType.BStr)] string Charset, out tagMIMECSETINFO pCharsetInfo);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void IsConvertible([In] uint dwSrcEncoding, [In] uint dwDstEncoding);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ConvertString([In, Out] ref uint pdwMode, [In] uint dwSrcEncoding, [In] uint dwDstEncoding, [In] ref byte pSrcStr, [In, Out] ref uint pcSrcSize, [In] ref byte pDstStr, [In, Out] ref uint pcDstSize);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ConvertStringToUnicode([In, Out] ref uint pdwMode, [In] uint dwEncoding, [In] ref sbyte pSrcStr, [In, Out] ref uint pcSrcSize, [In] ref ushort pDstStr, [In, Out] ref uint pcDstSize);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ConvertStringFromUnicode([In, Out] ref uint pdwMode, [In] uint dwEncoding, [In] ref ushort pSrcStr, [In, Out] ref uint pcSrcSize, [In] ref sbyte pDstStr, [In, Out] ref uint pcDstSize);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ConvertStringReset();
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetRfc1766FromLcid([In] uint locale, [MarshalAs(UnmanagedType.BStr)] out string pbstrRfc1766);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetLcidFromRfc1766(out uint plocale, [In, MarshalAs(UnmanagedType.BStr)] string bstrRfc1766);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void EnumRfc1766([In] ushort LangId, [MarshalAs(UnmanagedType.Interface)] out IEnumRfc1766 ppEnumRfc1766);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetRfc1766Info([In] uint locale, [In] ushort LangId, out tagRFC1766INFO pRfc1766Info);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void CreateConvertCharset([In] uint uiSrcCodePage, [In] uint uiDstCodePage, [In] uint dwProperty, [MarshalAs(UnmanagedType.Interface)] out CMLangConvertCharset ppMLangConvertCharset);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ConvertStringInIStream([In, Out] ref uint pdwMode, [In] uint dwFlag, [In] ref ushort lpFallBack, [In] uint dwSrcEncoding, [In] uint dwDstEncoding, [In, MarshalAs(UnmanagedType.Interface)] IStream pstmIn, [In, MarshalAs(UnmanagedType.Interface)] IStream pstmOut);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ConvertStringToUnicodeEx([In, Out] ref uint pdwMode, [In] uint dwEncoding, [In] ref sbyte pSrcStr, [In, Out] ref uint pcSrcSize, [In] ref ushort pDstStr, [In, Out] ref uint pcDstSize, [In] uint dwFlag, [In] ref ushort lpFallBack);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ConvertStringFromUnicodeEx([In, Out] ref uint pdwMode, [In] uint dwEncoding, [In] ref ushort pSrcStr, [In, Out] ref uint pcSrcSize, [In] ref sbyte pDstStr, [In, Out] ref uint pcDstSize, [In] uint dwFlag, [In] ref ushort lpFallBack);
        
        
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void DetectCodepageInIStream([In] MLDETECTCP flags,
            [In] uint dwPrefWinCodePage,
            [In, MarshalAs(UnmanagedType.Interface)] IStream pstmIn,
            [In, Out] ref DetectEncodingInfo lpEncoding, 
            [In, Out] ref int pnScores);
        
        
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void DetectInputCodepage([In] MLDETECTCP flags, [In] uint dwPrefWinCodePage,
            [In] ref byte pSrcStr, [In, Out] ref int pcSrcSize, 
            [In, Out] ref DetectEncodingInfo lpEncoding, 
            [In, Out] ref int pnScores);
        
        
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ValidateCodePage([In] uint uiCodePage, [In, ComAliasName("MultiLanguage.wireHWND")] ref _RemotableHandle hwnd);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetCodePageDescription([In] uint uiCodePage, [In] uint lcid, [In, Out, MarshalAs(UnmanagedType.LPWStr)] string lpWideCharStr, [In] int cchWideChar);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void IsCodePageInstallable([In] uint uiCodePage);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void SetMimeDBSource([In] tagMIMECONTF dwSource);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetNumberOfScripts(out uint pnScripts);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void EnumScripts([In] uint dwFlags, [In] ushort LangId, [MarshalAs(UnmanagedType.Interface)] out IEnumScript ppEnumScript);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void ValidateCodePageEx([In] uint uiCodePage, [In, ComAliasName("MultiLanguage.wireHWND")] ref _RemotableHandle hwnd, [In] uint dwfIODControl);
    }
}