C# Simple Version:

        [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
        public class LOGFONT
        {
            public int lfHeight = 0;
            public int lfWidth = 0;
            public int lfEscapement = 0;
            public int lfOrientation = 0;
            public int lfWeight = 0;
            public byte lfItalic = 0;
            public byte lfUnderline = 0;
            public byte lfStrikeOut = 0;
            public byte lfCharSet = 0;
            public byte lfOutPrecision = 0;
            public byte lfClipPrecision = 0;
            public byte lfQuality = 0;
            public byte lfPitchAndFamily = 0;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)]
            public string lfFaceName = string.Empty;
        }

C# Signature:

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public class LOGFONT
        {
            public int lfHeight;
            public int lfWidth;
            public int lfEscapement;
            public int lfOrientation;
            public FontWeight lfWeight;
            [MarshalAs(UnmanagedType.U1)]
            public bool lfItalic;
            [MarshalAs(UnmanagedType.U1)]
            public bool lfUnderline;
            [MarshalAs(UnmanagedType.U1)]
            public bool lfStrikeOut;
            public FontCharSet lfCharSet;
            public FontPrecision lfOutPrecision;
            public FontClipPrecision lfClipPrecision;
            public FontQuality lfQuality;
            public FontPitchAndFamily lfPitchAndFamily;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string lfFaceName;

            public override string ToString()
            {
                StringBuilder sb = new StringBuilder();
                sb.Append("LOGFONT\n");
                sb.AppendFormat("   lfHeight: {0}\n", lfHeight);
                sb.AppendFormat("   lfWidth: {0}\n", lfWidth);
                sb.AppendFormat("   lfEscapement: {0}\n", lfEscapement);
                sb.AppendFormat("   lfOrientation: {0}\n", lfOrientation);
                sb.AppendFormat("   lfWeight: {0}\n", lfWeight);
                sb.AppendFormat("   lfItalic: {0}\n", lfItalic);
                sb.AppendFormat("   lfUnderline: {0}\n", lfUnderline);
                sb.AppendFormat("   lfStrikeOut: {0}\n", lfStrikeOut);
                sb.AppendFormat("   lfCharSet: {0}\n", lfCharSet);
                sb.AppendFormat("   lfOutPrecision: {0}\n", lfOutPrecision);
                sb.AppendFormat("   lfClipPrecision: {0}\n", lfClipPrecision);
                sb.AppendFormat("   lfQuality: {0}\n", lfQuality);
                sb.AppendFormat("   lfPitchAndFamily: {0}\n", lfPitchAndFamily);
                sb.AppendFormat("   lfFaceName: {0}\n", lfFaceName);

                return sb.ToString();
            }
        }

VB .NET Signature:

    <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi)> _
    Public Structure LOGFONT
    Public lfHeight As Int32
    Public lfWidth As Int32
    Public lfEscapement As Int32
    Public lfOrientation As Int32
    Public lfWeight As Int32
    Public lfItalic As Byte
    Public lfUnderline As Byte
    Public lfStrikeOut As Byte
    Public lfCharSet As Byte
    Public lfOutPrecision As Byte
    Public lfClipPrecision As Byte
    Public lfQuality As Byte
    Public lfPitchAndFamily As Byte
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=32)> _
    Public lfFaceName As String
    End Structure

C# User-Defined Types:

        public enum FontWeight : int
        {
            FW_DONTCARE = 0,
            FW_THIN = 100,
            FW_EXTRALIGHT = 200,
            FW_LIGHT = 300,
            FW_NORMAL = 400,
            FW_MEDIUM = 500,
            FW_SEMIBOLD = 600,
            FW_BOLD = 700,
            FW_EXTRABOLD = 800,
            FW_HEAVY = 900,
        }
        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,
        }
        public enum FontPrecision : byte
        {
            OUT_DEFAULT_PRECIS = 0,
            OUT_STRING_PRECIS = 1,
            OUT_CHARACTER_PRECIS = 2,
            OUT_STROKE_PRECIS = 3,
            OUT_TT_PRECIS = 4,
            OUT_DEVICE_PRECIS = 5,
            OUT_RASTER_PRECIS = 6,
            OUT_TT_ONLY_PRECIS = 7,
            OUT_OUTLINE_PRECIS = 8,
            OUT_SCREEN_OUTLINE_PRECIS = 9,
            OUT_PS_ONLY_PRECIS = 10,
        }
        public enum FontClipPrecision : byte
        {
            CLIP_DEFAULT_PRECIS = 0,
            CLIP_CHARACTER_PRECIS = 1,
            CLIP_STROKE_PRECIS = 2,
            CLIP_MASK = 0xf,
            CLIP_LH_ANGLES = (1 << 4),
            CLIP_TT_ALWAYS = (2 << 4),
            CLIP_DFA_DISABLE = (4 << 4),
            CLIP_EMBEDDED = (8 << 4),
        }
        public enum FontQuality : byte
        {
            DEFAULT_QUALITY = 0,
            DRAFT_QUALITY = 1,
            PROOF_QUALITY = 2,
            NONANTIALIASED_QUALITY = 3,
            ANTIALIASED_QUALITY = 4,
            CLEARTYPE_QUALITY = 5,
            CLEARTYPE_NATURAL_QUALITY = 6,
        }
        [Flags]
        public enum FontPitchAndFamily : byte
        {
            DEFAULT_PITCH = 0,
            FIXED_PITCH = 1,
            VARIABLE_PITCH = 2,
            FF_DONTCARE = (0 << 4),
            FF_ROMAN = (1 << 4),
            FF_SWISS = (2 << 4),
            FF_MODERN = (3 << 4),
            FF_SCRIPT = (4 << 4),
            FF_DECORATIVE = (5 << 4),
        }

VB .NET User-Defined Types:

    Public Enum FontWeight As Integer
    FW_DONTCARE = 0
    FW_THIN = 100
    FW_EXTRALIGHT = 200
    FW_LIGHT = 300
    FW_NORMAL = 400
    FW_MEDIUM = 500
    FW_SEMIBOLD = 600
    FW_BOLD = 700
    FW_EXTRABOLD = 800
    FW_HEAVY = 900
    End Enum

    Public Enum FontCharSet As 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
    End Enum
    Public Enum FontPrecision As Byte
    OUT_DEFAULT_PRECIS = 0
    OUT_STRING_PRECIS = 1
    OUT_CHARACTER_PRECIS = 2
    OUT_STROKE_PRECIS = 3
    OUT_TT_PRECIS = 4
    OUT_DEVICE_PRECIS = 5
    OUT_RASTER_PRECIS = 6
    OUT_TT_ONLY_PRECIS = 7
    OUT_OUTLINE_PRECIS = 8
    OUT_SCREEN_OUTLINE_PRECIS = 9
    OUT_PS_ONLY_PRECIS = 10
    End Enum
    Public Enum FontClipPrecision As Byte
    CLIP_DEFAULT_PRECIS = 0
    CLIP_CHARACTER_PRECIS = 1
    CLIP_STROKE_PRECIS = 2
    CLIP_MASK = &HF
    CLIP_LH_ANGLES = (1 << 4)
    CLIP_TT_ALWAYS = (2 << 4)
    CLIP_DFA_DISABLE = (4 << 4)
    CLIP_EMBEDDED = (8 << 4)
    End Enum
    Public Enum FontQuality As Byte
    DEFAULT_QUALITY = 0
    DRAFT_QUALITY = 1
    PROOF_QUALITY = 2
    NONANTIALIASED_QUALITY = 3
    ANTIALIASED_QUALITY = 4
    CLEARTYPE_QUALITY = 5
    CLEARTYPE_NATURAL_QUALITY = 6
    End Enum
    Public Enum FontPitchAndFamily As Byte

    DEFAULT_PITCH = 0
    FIXED_PITCH = 1
    VARIABLE_PITCH = 2
    FF_DONTCARE = (0 << 4)
    FF_ROMAN = (1 << 4)
    FF_SWISS = (2 << 4)
    FF_MODERN = (3 << 4)
    FF_SCRIPT = (4 << 4)
    FF_DECORATIVE = (5 << 4)
    End Enum

Notes:

See this MSDN reference: Default Marshaling for Strings

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpcondefaultmarshalingforstrings.asp

Tips & Tricks:

1) In VB .NET, the CharSet property had to be set to Ansi for it to work with LogFonts embedded in Eastman/Wang style annotation.

2) The FromLogFont method in VB .NET would return "Times New Roman" as the Font.name for many LogFont.lfFaceName that were not "Times New Roman.

Sample Code:

        // =========================================================================
        // EXAMPLE 1 - Filling a Font object with a LOGFONT.
        //        [in]    LayoutDesign.CtlLayout (ActiveX control)
        //        [out]    fontReceived (System.Drawing.Font)

        // An ActiveX control returns a handle to a LOGFONT in unmanaged global mem.
          IntPtr hHGlobalLOGFONT = (IntPtr)LayoutDesign.CtlLayout.BorderTextLogfont;

        // Stake a claim to the memory and get a pointer to it.
          IntPtr pLOGFONT = DLLKernel32.GlobalLock(hHGlobalLOGFONT);

        // Instantiate a managed logical font struct (as defined above!)
          LOGFONT lf = new LOGFONT();

        // Copy the LOGFONT data into managed mem.
        Marshal.PtrToStructure(pLOGFONT, lf);

        // Create the Font object.
        Font fontReceived = Font.FromLogFont(lf);

        // Release the claim to the global mem.
          DLLKernel32.GlobalUnlock(hHGlobalLOGFONT);

        // ... Do whatever with the Font object "fontReceived" ...

        // =========================================================================
        // EXAMPLE 2 - Reversing the process.
        //        [in]    fontReceived (System.Drawing.Font)
        //        [out]    LayoutDesign.CtlLayout (ActiveX control)

        // Use the ActiveX's global memory.
          IntPtr hHGlobalLOGFONT = (IntPtr)LayoutDesign.CtlLayout.BorderTextLogfont;

        // Stake a claim to the memory and get a pointer to it.
          IntPtr pLOGFONT = DLLKernel32.GlobalLock(hHGlobalLOGFONT);

        // Instantiate a managed logical font struct (as defined above!)
          LOGFONT lf = new LOGFONT();

        // Load the LOGFONT struct from the managed Font object.
        fontReceived.ToLogFont(lf);

        // Copy the LOGFONT data into managed mem.
        Marshal.StructureToPtr(pLOGFONT, lf, false);

        // Release the claim to the global mem.
          DLLKernel32.GlobalUnlock(hHGlobalLOGFONT);

        // Update the ActiveX control.
        (IntPtr)LayoutDesign.CtlLayout.BorderTextLogfont = hHGlobalLOGFONT;

Alternative Managed API:

The .NET Framework class Font, has a method, Font::FromLogfont that takes an Object reference as it's method parameter. You must define a managed LOGFONT class using the same format as the C# signature above. When using the StructLayout attribute on the class definition, you must set the CharSet property to Auto (the default is Ansi, which will not work correctly). The only difficulty encountered is passing the string value (the designated Font Face Name) to the FromLogfont method; apparently, this must have the attribute: [MarshalAs(UnmanagedType::ByValTStr)] enum value for the method to work correctly. Then, when instantiating a new Font in your managed application, you must cast the LOGFONT class (with appropriate member values assigned) to a System::Object for the function to work without generating a runtime exception.

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