.

        CharSet = CharSet.Auto,

.

      CharSet:=CharSet.Auto, _

.

    [DllImport(@"wininet", SetLastError = true, CharSet = CharSet.Auto, EntryPoint = "DeleteUrlCacheGroup", CallingConvention = CallingConvention.StdCall)]

.

       CharSet:=CharSet.Auto, _

.

[DllImport(@"wininet",SetLastError=true,CharSet=CharSet.Auto,EntryPoint="FindFirstUrlCacheEntryA",CallingConvention=CallingConvention.StdCall)]

.

       CharSet:=CharSet.Auto, _

.

       CharSet:=CharSet.Auto, _

.

    [DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]

.

        CharSet:=CharSet.Auto, _

.

       CharSet:=CharSet.Auto, _

.

[DllImport("wininet.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)]

.

[DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto)]

.

  <DllImport("wininet.dll", SetLastError := True, CharSet := CharSet.Auto)> _

.

[DllImport("wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]

.

[DllImport("wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]

.

[DllImport("wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]

.

[DllImport("wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]

.

    [DllImport("wininet.dll", EntryPoint = "InternetConnectW", CharSet = CharSet.Auto, SetLastError = true)]

.

    [DllImport("wininet.dll", EntryPoint = "InternetOpenW", CharSet = CharSet.Auto, SetLastError = true)]

.

    [DllImport("wininet.dll", EntryPoint = "FtpGetFile", SetLastError = true, CharSet = CharSet.Auto)]

.

    [DllImport("wininet.dll", EntryPoint = "FtpOpenFile", SetLastError = true, CharSet = CharSet.Auto)]

.

[DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto)]

.

[DllImport("wininet.dll", SetLastError=true, CharSet = CharSet.Auto)]

.

[DllImport("wininet.dll", CharSet = CharSet.Auto)]

.

[DllImport("wininet.dll", CharSet=CharSet.Auto, SetLastError=true)]

.

[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]

.

[DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto)]

.

[DllImport("wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]

.

[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]

.

    [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]

.

[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]

.

[DllImport("wininet.dll", SetLastError=true, CharSet=CharSet.Auto)]

.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

    [DllImport("wininet.dll", CharSet=CharSet.Auto, SetLastError=true)]

.

     <DllImport("wininet.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _

.

    [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]

.

[DllImport("wininet.dll", SetLastError = true, CharSet=CharSet.Auto)]

.

<DllImport("wininet.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _

.

    <DllImport("wininet.dll", SetLastError:=True, CharSet:=CharSet.Auto, EntryPoint:="PrivacySetZonePreferenceW", CallingConvention:=CallingConvention.StdCall)> _

.

    <DllImport("wininet.dll", SetLastError:=True, CharSet:=CharSet.Auto, EntryPoint:="PrivacySetZonePreferenceW", CallingConvention:=CallingConvention.StdCall)> _

.

[DllImport("gdi32.dll", EntryPoint = "CopyEnhMetaFile", SetLastError = true, CharSet = CharSet.Auto)]

.

<DllImport("gdi32.dll", SetLastError:=True, CharSet:=CharSet.Ansi)> _

.

    [DllImport("gdi32.dll", EntryPoint = "CreateDC", CharSet = CharSet.Auto, SetLastError = true)]

.

      [DllImport("gdi32.dll", CharSet=CharSet.Auto)]

.

      [DllImport("gdi32.dll", CharSet=CharSet.Auto)]

.

    private const byte DEFAULT_CHARSET = 1;

.

    private const byte SHIFTJIS_CHARSET = 128;

.

    private const byte JOHAB_CHARSET = 130;

.

    private const byte EASTEUROPE_CHARSET = 238;

.

    [DllImport("gdi32.dll", CharSet = CharSet.Auto)]

.

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

    public FontCharSet lfCharSet;

.

    public enum FontCharSet : byte

.

    ANSI_CHARSET = 0,

.

    DEFAULT_CHARSET = 1,

.

    SYMBOL_CHARSET = 2,

.

    SHIFTJIS_CHARSET = 128,

.

    HANGEUL_CHARSET = 129,

.

    HANGUL_CHARSET = 129,

.

    GB2312_CHARSET = 134,

.

    CHINESEBIG5_CHARSET = 136,

.

    OEM_CHARSET = 255,

.

    JOHAB_CHARSET = 130,

.

    HEBREW_CHARSET = 177,

.

    ARABIC_CHARSET = 178,

.

    GREEK_CHARSET = 161,

.

    TURKISH_CHARSET = 162,

.

    VIETNAMESE_CHARSET = 163,

.

    THAI_CHARSET = 222,

.

    EASTEUROPE_CHARSET = 238,

.

    RUSSIAN_CHARSET = 204,

.

    MAC_CHARSET = 77,

.

    BALTIC_CHARSET = 186,

.

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

    public byte tmCharSet;

.

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

    lf.lfCharSet = FontCharSet.DEFAULT_CHARSET;

.

        public enum FontLanguageCharSet

.

            ANSI_CHARSET = 0x00000000,

.

            DEFAULT_CHARSET = 0x00000001,

.

            SYMBOL_CHARSET = 0x00000002,

.

            MAC_CHARSET = 0x0000004D,

.

            SHIFTJIS_CHARSET = 0x00000080,

.

            HANGUL_CHARSET = 0x00000081,

.

            JOHAB_CHARSET = 0x00000082,

.

            GB2312_CHARSET = 0x00000086,

.

            CHINESEBIG5_CHARSET = 0x00000088,

.

            GREEK_CHARSET = 0x000000A1,

.

            TURKISH_CHARSET = 0x000000A2,

.

            VIETNAMESE_CHARSET = 0x000000A3,

.

            HEBREW_CHARSET = 0x000000B1,

.

            ARABIC_CHARSET = 0x000000B2,

.

            BALTIC_CHARSET = 0x000000BA,

.

            RUSSIAN_CHARSET = 0x000000CC,

.

            THAI_CHARSET = 0x000000DE,

.

            EASTEUROPE_CHARSET = 0x000000EE,

.

            OEM_CHARSET = 0x000000FF

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

            public Byte lfCharSet;

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

            public Byte tmCharSet;

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

            public Byte tmCharSet;

.

        [DllImport("gdi32.dll", CharSet = CharSet.Auto)]

.

                var logfont = new LOGFONT() { lfCharSet = (byte)FontLanguageCharSet.DEFAULT_CHARSET };

.

            // Fixed Pitch & ANSI_CHARSET

.

            List<string> mono = (from f in allFonts where ((f.LogFont.elfLogFont.lfPitchAndFamily & 0x3) == (int)GdiFonts.FontPitch.FIXED_PITCH) & (GdiFonts.FontLanguageCharSet)f.LogFont.elfLogFont.lfCharSet == GdiFonts.FontLanguageCharSet.ANSI_CHARSET select f.LogFont.elfFullName).ToList<string>();

.

            // Variable Pitch & ANSI_CHARSET

.

            List<string> variable = (from f in allFonts where ((f.LogFont.elfLogFont.lfPitchAndFamily & 0x3) == (int)GdiFonts.FontPitch.VARIABLE_PITCH) & (GdiFonts.FontLanguageCharSet)f.LogFont.elfLogFont.lfCharSet == GdiFonts.FontLanguageCharSet.ANSI_CHARSET select f.LogFont.elfFullName).ToList<string>();

.

    private const byte DEFAULT_CHARSET = 1;

.

    private const byte SHIFTJIS_CHARSET = 128;

.

    private const byte JOHAB_CHARSET = 130;

.

    private const byte EASTEUROPE_CHARSET = 238;

.

    [DllImport("gdi32.dll", CharSet = CharSet.Auto)]

.

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

    public FontCharSet lfCharSet;

.

    public enum FontCharSet : byte

.

    ANSI_CHARSET = 0,

.

    DEFAULT_CHARSET = 1,

.

    SYMBOL_CHARSET = 2,

.

    SHIFTJIS_CHARSET = 128,

.

    HANGEUL_CHARSET = 129,

.

    HANGUL_CHARSET = 129,

.

    GB2312_CHARSET = 134,

.

    CHINESEBIG5_CHARSET = 136,

.

    OEM_CHARSET = 255,

.

    JOHAB_CHARSET = 130,

.

    HEBREW_CHARSET = 177,

.

    ARABIC_CHARSET = 178,

.

    GREEK_CHARSET = 161,

.

    TURKISH_CHARSET = 162,

.

    VIETNAMESE_CHARSET = 163,

.

    THAI_CHARSET = 222,

.

    EASTEUROPE_CHARSET = 238,

.

    RUSSIAN_CHARSET = 204,

.

    MAC_CHARSET = 77,

.

    BALTIC_CHARSET = 186,

.

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

    public byte tmCharSet;

.

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

    lf.lfCharSet = FontCharSet.DEFAULT_CHARSET;

.

        public enum FontLanguageCharSet

.

            ANSI_CHARSET = 0x00000000,

.

            DEFAULT_CHARSET = 0x00000001,

.

            SYMBOL_CHARSET = 0x00000002,

.

            MAC_CHARSET = 0x0000004D,

.

            SHIFTJIS_CHARSET = 0x00000080,

.

            HANGUL_CHARSET = 0x00000081,

.

            JOHAB_CHARSET = 0x00000082,

.

            GB2312_CHARSET = 0x00000086,

.

            CHINESEBIG5_CHARSET = 0x00000088,

.

            GREEK_CHARSET = 0x000000A1,

.

            TURKISH_CHARSET = 0x000000A2,

.

            VIETNAMESE_CHARSET = 0x000000A3,

.

            HEBREW_CHARSET = 0x000000B1,

.

            ARABIC_CHARSET = 0x000000B2,

.

            BALTIC_CHARSET = 0x000000BA,

.

            RUSSIAN_CHARSET = 0x000000CC,

.

            THAI_CHARSET = 0x000000DE,

.

            EASTEUROPE_CHARSET = 0x000000EE,

.

            OEM_CHARSET = 0x000000FF

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

            public Byte lfCharSet;

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

            public Byte tmCharSet;

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

            public Byte tmCharSet;

.

        [DllImport("gdi32.dll", CharSet = CharSet.Auto)]

.

                var logfont = new LOGFONT() { lfCharSet = (byte)FontLanguageCharSet.DEFAULT_CHARSET };

.

            // Fixed Pitch & ANSI_CHARSET

.

            List<string> mono = (from f in allFonts where ((f.LogFont.elfLogFont.lfPitchAndFamily & 0x3) == (int)GdiFonts.FontPitch.FIXED_PITCH) & (GdiFonts.FontLanguageCharSet)f.LogFont.elfLogFont.lfCharSet == GdiFonts.FontLanguageCharSet.ANSI_CHARSET select f.LogFont.elfFullName).ToList<string>();

.

            // Variable Pitch & ANSI_CHARSET

.

            List<string> variable = (from f in allFonts where ((f.LogFont.elfLogFont.lfPitchAndFamily & 0x3) == (int)GdiFonts.FontPitch.VARIABLE_PITCH) & (GdiFonts.FontLanguageCharSet)f.LogFont.elfLogFont.lfCharSet == GdiFonts.FontLanguageCharSet.ANSI_CHARSET select f.LogFont.elfFullName).ToList<string>();

.

[DllImport("gdiplus.dll", CharSet=CharSet.Unicode)]

.

        [DllImport("gdiplus.dll", CharSet=CharSet.Unicode)]

.

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]

.

Summary

The GetTextCharsetInfo API

.

static extern int GetTextCharsetInfo(IntPtr hdc, IntPtr lpSig, uint dwFlags);

.

Documentation

[GetTextCharsetInfo] on MSDN

.

If you need to treat unicode text, you'll need to set the CharSet option to Unicode or Auto (which is default on WindowsNT)

.

[DllImport("gdi32.dll", CharSet=CharSet.Unicode)]

.

If you need to treat unicode text, you'll need to set the CharSet option to Unicode or Auto (which is default on WindowsNT)

.

[DllImport("gdi32.dll", CharSet=CharSet.Unicode)]

.

[DllImport("gdi32.dll", CharSet = CharSet.Auto)]

.

//CharSet.auto automatically selects between these functions based on the OS version:

.

[DllImport("gdi32.dll", CharSet = CharSet.Unicode)]

.

[DllImport("gdi32.dll", CharSet = CharSet.Ansi)]

.

It's very important to use the same charset on the TEXTMETRIC structure and the extern function.

.

[DllImport("Gdi32.dll", CharSet=CharSet.Auto)]

.

[DllImport("Gdi32.dll", CharSet=CharSet.Auto)]

.

[DllImport("Gdi32.dll", CharSet=CharSet.Auto)]

.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

.

   public byte tmCharSet;

.

[StructLayout(LayoutKind::Sequential, CharSet=CharSet::Unicode)]

.

   Byte tmCharSet;

.

[DllImport("Gdi32.dll", CharSet=CharSet::Unicode)]

.

    [DllImport("user32.dll",CharSet=CharSet.Auto)]

.

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]

.

[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]

.

[DllImport("user32.dll", CharSet=CharSet.Unicode)]

.

[DllImport("gdi32.dll", CharSet = CharSet.Auto)]

.

   string lpString, int cbString); (Please see note for CharSet in tips)

.

[CharSet = CharSet.Auto] According to my experience this parameter should be used when using a LOGFONT structure and the CreateFontIndirect fuction, otherwise the selected font will not be displayed. All flags will be done (lfItalic, lfUnderline ...) but not the lfFaceName string.

.

[DllImport("wer.dll", SetLastError = true, CharSet = CharSet.Unicode)]

.

    <DllImport("wer.dll", SetLastError:=True, CharSet:=CharSet.Unicode)> Private Shared Function WerAddExcludedApplication(ByVal pwzExeName As String, ByVal bAllUsers As Boolean) As Integer

.

[DllImport("wer.dll", CharSet = CharSet.Unicode, SetLastError = true)]

.

[DllImport("wer.dll", CharSet = CharSet.Unicode, SetLastError = true)]

.

[DllImport("wer.dll", CharSet = CharSet.Unicode, SetLastError = true)]

.

[DllImport("wer.dll", CharSet = CharSet.Unicode, SetLastError = true)]

.

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto, Pack=4)]

.

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto, Pack=4)]

.

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto, Pack=4), ComConversionLoss]

.

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto, Pack=4), ComConversionLoss]

.

        [DllImport("urlmon.dll", CharSet=CharSet.Auto,SetLastError=true, PreserveSig=false)]

.

    <DllImport("ole32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True, PreserveSig:=False)>

.

<StructLayout(LayoutKind.Sequential, CharSet := CharSet.Unicode)> _

.

<StructLayout(LayoutKind.Sequential, CharSet := CharSet.Unicode)> _

.

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]

.

    <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)> _

.

[StructLayout ( LayoutKind.Sequential, CharSet = CharSet.Auto, Pack = 4 )]

.

[DllImport("powrprof.dll", SetLastError=true, CharSet = CharSet.Auto)]

.

    [DllImport("PowrProf.dll", CharSet = CharSet.Auto, SetLastError = true)]

.

    [DllImport("PowrProf.dll", CharSet = CharSet.Auto, SetLastError = true)]

.

[DllImport("powrprof.dll", SetLastError=true, CharSet=CharSet.Unicode)]

.

[DllImport("hid.dll", CharSet=CharSet.Auto, SetLastError=true)]

.

    <DllImport("hid.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _

.

Note the use of CharSet.Auto in the DLL template.

.

The winmm dll may not execute properly on 64-bit systems. Consequently, the StructLayout must be Sequential, with CharSet = Ansi, and Pack = 4. This particular type has some special layout considerations (the c union keyword) which typically means developers would use the explicit layout. However, the explicit layout breaks down on 64-bit systems for any type with an IntPtr in the type. Consequently, the C# types have been redesigned to use Sequential layout so that they will automatically adjust to 64-bit systems. This means private fields with public properties which perform the gunky work of making it look like there is a union.

.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 4)]

.

[DllImport("winmm.dll", CharSet = CharSet.Unicode)]

.

The winmm dll may not execute properly on 64-bit systems. Consequently, the StructLayout must be Sequential, with CharSet = Ansi, and Pack = 4. This particular type has some special layout considerations (the c union keyword) which typically means developers would use the explicit layout. However, the explicit layout breaks down on 64-bit systems for any type with an IntPtr in the type. Consequently, the C# types have been redesigned to use Sequential layout so that they will automatically adjust to 64-bit systems. This means private fields with public properties which perform the gunky work of making it look like there is a union.

.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 4)]

.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 4)]

.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 4)]

.

[DllImport("winmm.dll", CharSet = CharSet.Unicode)]