Code
/// <summary>
    /// 定点数
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct FIXED
    {
        /// <summary>
        /// 小数部分
        /// </summary>
        public ushort fract;
        /// <summary>
        /// 整数部分
        /// </summary>
        public short value;
    }

    /// <summary>
    /// 转换矩阵
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct MAT2
    {
        [MarshalAs(UnmanagedType.Struct)]
        public FIXED eM11;
        [MarshalAs(UnmanagedType.Struct)]
        public FIXED eM12;
        [MarshalAs(UnmanagedType.Struct)]
        public FIXED eM21;
        [MarshalAs(UnmanagedType.Struct)]
        public FIXED eM22;
    }

    /// <summary>
    /// 点结构
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct POINT
    {
        /// <summary>
        /// X值
        /// </summary>
        public int x;
        /// <summary>
        /// Y值
        /// </summary>
        public int y;
    }

    /// <summary>
    /// 图形信息结构
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct GLYPHMETRICS
    {
        public uint gmBlackBoxX;
        public uint gmBlackBoxY;
        [MarshalAs(UnmanagedType.Struct)]
        public POINT gmptGlyphOrigin;
        public short gmCellIncX;
        public short gmCellIncY;
    }

    /// <summary>
    /// 扩展点结构
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct POINTFX
    {
        /// <summary>
        /// X值
        /// </summary>
        [MarshalAs(UnmanagedType.Struct)]
        public FIXED x;
        /// <summary>
        /// Y值
        /// </summary>
        [MarshalAs(UnmanagedType.Struct)]
        public FIXED y;
    }

    /// <summary>
    /// 字形轮廓头结构
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct TTPOLYGONHEADER
    {
        /// <summary>
        /// 轮廓字节数
        /// </summary>
        public int cb;
        /// <summary>
        /// 轮廓类型
        /// </summary>
        public int dwType;
        /// <summary>
        /// 多边形的起始点
        /// </summary>
        [MarshalAs(UnmanagedType.Struct)]
        public POINTFX pfxStart;
    }

    /// <summary>
    /// 线段头结构，不包含点序列
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct TTPOLYCURVEHEAD
    {
        /// <summary>
        /// 线类型，折线(TT_PRIM_LINE)=1;B样条曲线(TT_PRIM_OSPLINE)=2
        /// </summary>
        public short wType;
        /// <summary>
        /// 点序列中包含点的个数
        /// </summary>
        public short cpfx;
    }

Code
 public class GdiNativeMethods
    {
        [DllImport("gdi32.dll")]
        public static extern IntPtr SelectObject(IntPtr hdc, IntPtr obj);

        [DllImport("gdi32.dll")]
        public static extern int GetGlyphOutline(IntPtr hdc, uint uChar, uint fuFormat, out GLYPHMETRICS lpgm, uint cbBuffer, IntPtr lpBuffer, ref MAT2 lpmat2);

        [DllImport("Kernel32.dll")]
        public static extern IntPtr CloseHandle(IntPtr hObject);
    }

Code
private uint GetGB2312Coding(char ch)
        {//获得字符的GB码
            byte[] bts = Encoding.GetEncoding("GB2312").GetBytes(new char[] { ch });
            uint val = bts[0];
            if (bts.Length > 1)
            {
                val = val * 256 + bts[1];
            }
            return val;
        }

Code
private void button1_Click(object sender, EventArgs e)
        {//将取出的信息显示在richTextBox1里面
            richTextBox1.Text = "";
            foreach (char t in textBox1.Text)
            {
                uint ch = GetGB2312Coding(t);
                Graphics g = Graphics.FromHwnd(IntPtr.Zero);
                IntPtr hdc = g.GetHdc();

                //将字体选入场景
                IntPtr fontPtr = textBox1.Font.ToHfont();
                GdiNativeMethods.SelectObject(hdc, fontPtr);

                MAT2 mat2 = new MAT2();
                mat2.eM11.value = 1;
                mat2.eM22.value = 1;

                GLYPHMETRICS lpGlyph = new GLYPHMETRICS();

                //获取缓存区大小
                int bufferSize = GdiNativeMethods.GetGlyphOutline(hdc, ch, 1, out lpGlyph, 0, IntPtr.Zero, ref mat2);

                if (bufferSize > 0)
                {
                    //获取成功后，分配托管内存
                    IntPtr ipvbuffer = Marshal.AllocHGlobal(bufferSize);

                    int ret = GdiNativeMethods.GetGlyphOutline(hdc, ch, 1, out lpGlyph, (uint)bufferSize, ipvbuffer, ref mat2);
                    if (ret > 0)
                    {
                        byte[] b = new byte[bufferSize];
                        for (int i = 0; i < bufferSize; i++)
                        {
                            b[i] = Marshal.ReadByte((IntPtr)(ipvbuffer.ToInt32() + i * 8));
                            richTextBox1.Text += b[i].ToString() + "\r\n";
                        }
                        
                    }
                    label1.Text =ret.ToString();
                }