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Detect Encoding for In- and Outgoing Text

, 27 Oct 2009
Detect the encoding of a text without BOM (Byte Order Mask) and choose the best Encoding for persistence or network transport of text
namespace MultiLanguage
{
    using System;
    using System.Runtime.CompilerServices;
    using System.Runtime.InteropServices;
    using System.Security;

    [ComImport, Guid("275C23E1-3747-11D0-9FEA-00AA003F8646"), InterfaceType((short) 1)]
    public interface IMultiLanguage
    {
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetNumberOfCodePageInfo(out uint pcCodePage);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetCodePageInfo([In] uint uiCodePage, 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, [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([MarshalAs(UnmanagedType.Interface)] out IEnumRfc1766 ppEnumRfc1766);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetRfc1766Info([In] uint locale, 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);
    }
}

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About the Author

Carsten Zeumer
Software Developer (Senior)
Germany Germany
Carsten started programming Basic and Assembler back in the 80’s when he got his first C64. After switching to a x86 based system he started programming in Pascal and C. He started Windows programming with the arrival of Windows 3.0. After working for various internet companies developing a linguistic text analysis and classification software for 25hours communications he is now working as a contractor.
 
Carsten lives in Hamburg, Germany with his wife and five children.

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