如何 在 .net 下使用 zint 生成条形码

1、首先你需要编译好的 zint 条码库。什么，你没有？那没关系，请参看：在 win32 下编译 zint 条码库。

2、启动 VISUAL STUDIO，新建一 “Windows Forms Application”，将 zint.dll、zlib1.dll 和 libpng15.dll 添加到项目中，属性窗口中设置“Copy to Output Directory”为”Copy always”。

3、打开“Form1.cs”代码文件，声明 zint：

        /// <summary>
        /// 条形码编码类型。
        /// </summary>
        public enum Symbology
        {
            BARCODE_CODE11 = 1,
            BARCODE_C25MATRIX = 2,
            BARCODE_C25INTER = 3,
            BARCODE_C25IATA = 4,
            BARCODE_C25LOGIC = 6,
            BARCODE_C25IND = 7,
            BARCODE_CODE39 = 8,
            BARCODE_EXCODE39 = 9,
            BARCODE_EANX = 13,
            BARCODE_EAN128 = 16,
            BARCODE_CODABAR = 18,
            BARCODE_CODE128 = 20,
            BARCODE_DPLEIT = 21,
            BARCODE_DPIDENT = 22,
            BARCODE_CODE16K = 23,
            BARCODE_CODE49 = 24,
            BARCODE_CODE93 = 25,
            BARCODE_FLAT = 28,
            BARCODE_RSS14 = 29,
            BARCODE_RSS_LTD = 30,
            BARCODE_RSS_EXP = 31,
            BARCODE_TELEPEN = 32,
            BARCODE_UPCA = 34,
            BARCODE_UPCE = 37,
            BARCODE_POSTNET = 40,
            BARCODE_MSI_PLESSEY = 47,
            BARCODE_FIM = 49,
            BARCODE_LOGMARS = 50,
            BARCODE_PHARMA = 51,
            BARCODE_PZN = 52,
            BARCODE_PHARMA_TWO = 53,
            BARCODE_PDF417 = 55,
            BARCODE_PDF417TRUNC = 56,
            BARCODE_MAXICODE = 57,
            BARCODE_QRCODE = 58,
            BARCODE_CODE128B = 60,
            BARCODE_AUSPOST = 63,
            BARCODE_AUSREPLY = 66,
            BARCODE_AUSROUTE = 67,
            BARCODE_AUSREDIRECT = 68,
            BARCODE_ISBNX = 69,
            BARCODE_RM4SCC = 70,
            BARCODE_DATAMATRIX = 71,
            BARCODE_EAN14 = 72,
            BARCODE_CODABLOCKF = 74,
            BARCODE_NVE18 = 75,
            BARCODE_JAPANPOST = 76,
            BARCODE_KOREAPOST = 77,
            BARCODE_RSS14STACK = 79,
            BARCODE_RSS14STACK_OMNI = 80,
            BARCODE_RSS_EXPSTACK = 81,
            BARCODE_PLANET = 82,
            BARCODE_MICROPDF417 = 84,
            BARCODE_ONECODE = 85,
            BARCODE_PLESSEY = 86,

            BARCODE_TELEPEN_NUM = 87,
            BARCODE_ITF14 = 89,
            BARCODE_KIX = 90,
            BARCODE_AZTEC = 92,
            BARCODE_DAFT = 93,
            BARCODE_MICROQR = 97,

            BARCODE_HIBC_128 = 98,
            BARCODE_HIBC_39 = 99,
            BARCODE_HIBC_DM = 102,
            BARCODE_HIBC_QR = 104,
            BARCODE_HIBC_PDF = 106,
            BARCODE_HIBC_MICPDF = 108,
            BARCODE_HIBC_BLOCKF = 110,
            BARCODE_HIBC_AZTEC = 112,

            BARCODE_AZRUNE = 128,
            BARCODE_CODE32 = 129,
            BARCODE_EANX_CC = 130,
            BARCODE_EAN128_CC = 131,
            BARCODE_RSS14_CC = 132,
            BARCODE_RSS_LTD_CC = 133,
            BARCODE_RSS_EXP_CC = 134,
            BARCODE_UPCA_CC = 135,
            BARCODE_UPCE_CC = 136,
            BARCODE_RSS14STACK_CC = 137,
            BARCODE_RSS14_OMNI_CC = 138,
            BARCODE_RSS_EXPSTACK_CC = 139,
            BARCODE_CHANNEL = 140,
            BARCODE_CODEONE = 141,
            BARCODE_GRIDMATRIX = 142
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public struct ZintSymbolStruct
        {
            public Symbology symbology;

            public int height;
            public int whitespace_width;
            public int border_width;

            public int output_options;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string fgcolour;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string bgcolour;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
            public string outfile;

            public float scale;
            public int option_1;
            public int option_2;
            public int option_3;
            public int show_hrt;

            public int input_mode;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string text;

            public int rows;
            public int width;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string primary;

            [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.U1, SizeConst = 25454)]
            public byte[] encoded_data;

            [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.I4, SizeConst = 178)]
            public int[] row_height;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 100)]
            public string errtxt;

            public IntPtr bitmap;

            public int bitmap_width;
            public int bitmap_height;
            public IntPtr rendered;
        }

        [DllImport("zint.dll",
            CallingConvention = CallingConvention.StdCall,
            EntryPoint = "ZBarcode_Create")]
        public extern static IntPtr InitZint();

        [DllImport("zint.dll",
            CallingConvention = CallingConvention.StdCall,
            EntryPoint = "ZBarcode_Encode_and_Buffer",
            CharSet = CharSet.Ansi)]
        public extern static int ZintEncode(
             ref ZintSymbolStruct symbol,
             string input,
             int length,
             int rotate_angle);

        [DllImport("zint.dll",
            CallingConvention = CallingConvention.StdCall,
            EntryPoint = "ZBarcode_Encode_and_Print",
            CharSet = CharSet.Ansi)]
        public extern static int ZintEncodeAndPrint(
             ref ZintSymbolStruct symbol,
             string input,
             int length,
             int rotate_angle);

4、在窗体上绘制条码：

        protected override void OnPaint(PaintEventArgs e)
        {
            // 初始化编码器
            ZintSymbolStruct symbol = (ZintSymbolStruct)Marshal.PtrToStructure(InitZint(), typeof(ZintSymbolStruct));
            // 设置编码类型
            symbol.symbology = Symbology.BARCODE_QRCODE;
            // 缩放
            symbol.scale = 5;
            // 编码内容
            string s = "0123456789";
            // 编码
            ZintEncode(ref symbol, s, 0, 0);

            // 创建一个位图，以便绘制条码
            byte[] bitmapData = new byte[symbol.bitmap_width * symbol.bitmap_height * 3];
            Marshal.Copy(symbol.bitmap, bitmapData, 0, bitmapData.Length);
            Bitmap bitmap = new Bitmap(symbol.bitmap_width, symbol.bitmap_height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
            System.Drawing.Imaging.BitmapData bmpData = bitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, bitmap.PixelFormat);
            IntPtr ptr = bmpData.Scan0;
            int bytes = bmpData.Stride * bitmap.Height;
            byte[] rgbValues = new byte[bytes];
            Marshal.Copy(ptr, rgbValues, 0, bytes);

            // Zint 编码生成的位图数据存放格式为 RGB，需要将其转换为 BMP 数据存放格式 BGR
            int row, col;
            byte red, green, blue;
            int i = 0;
            int l = 0;
            for (row = 0; row < symbol.bitmap_height; row++)
            {
                l = bmpData.Stride * row;
                for (col = 0; col < symbol.bitmap_width; col++)
                {
                    red = bitmapData[i];
                    green = bitmapData[i + 1];
                    blue = bitmapData[i + 2];

                    rgbValues[l] = blue;
                    rgbValues[l + 1] = green;
                    rgbValues[l + 2] = red;

                    i += 3;
                    l += 3;
                }
            }
            System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes);
            bitmap.UnlockBits(bmpData);

            e.Graphics.DrawImage(bitmap, 12, 12);
        }

5、将目标平台更改为“x86”，运行后即可查看效果。

附源码下载。