IPAddress ip = IPAddress.Parse("192.168.1.212");            IPEndPoint iport = new IPEndPoint(ip, 9100);//9100为小票打印机指定端口            Socket soc = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            soc.Connect(iport);            bitmap = new Bitmap(@"D:\300X200.bmp");            soc.Send(bmpToByte(bitmap));            soc.Close();

public static byte[] bmpToByte(Bitmap bmp)        {            int h = bmp.Height / 24 + 1;            int w = bmp.Width;            byte[][] all = new byte[2 + 2 * h + h * w][];            all[0] = new byte[] { 0x1B, 0x33, 0x00 };            Color pixelColor;            // ESC * m nL nH 点阵图              byte[] escBmp = new byte[] { 0x1B, 0x2A, 0x21, (byte)(w % 256), (byte)(w / 256) };            // 每行进行打印              for (int i = 0; i < h; i++)            {                all[i * (w + 2) + 1] = escBmp;                for (int j = 0; j < w; j++)                {                    byte[] data = new byte[] { 0x00, 0x00, 0x00 };                    for (int k = 0; k < 24; k++)                    {                        if (((i * 24) + k) < bmp.Height)                        {                            pixelColor = bmp.GetPixel(j, (i * 24) + k);                            if (pixelColor.R == 0)                            {                                data[k / 8] += (byte)(128 >> (k % 8));                            }                        }                    }                    all[i * (w + 2) + j + 2] = data;                }                //换行                  all[(i + 1) * (w + 2)] = PrinterCmdUtils.nextLine(1);            }            all[h * (w + 2) + 1] = PrinterCmdUtils.nextLine(2);            return byteMerger(all);        }

public static byte[] byteMerger(byte[][] byteList)        {            int Length = 0;            for (int i = 0; i < byteList.Length; i++)            {                Length += byteList[i].Length;            }            byte[] result = new byte[Length];            int index = 0;            for (int i = 0; i < byteList.Length; i++)            {                byte[] nowByte = byteList[i];                for (int k = 0; k < byteList[i].Length; k++)                {                    result[index] = nowByte[k];                    index++;                }            }            return result;        }