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

 1 public static byte[] bmpToByte(Bitmap bmp)
 2         {
 3             int h = bmp.Height / 24 + 1;
 4             int w = bmp.Width;
 5             byte[][] all = new byte[2 + 2 * h + h * w][];
 6
 7             all[0] = new byte[] { 0x1B, 0x33, 0x00 };
 8
 9             Color pixelColor;
10             // ESC * m nL nH 点阵图
11             byte[] escBmp = new byte[] { 0x1B, 0x2A, 0x21, (byte)(w % 256), (byte)(w / 256) };
12
13             // 每行进行打印
14             for (int i = 0; i < h; i++)
15             {
16                 all[i * (w + 2) + 1] = escBmp;
17                 for (int j = 0; j < w; j++)
18                 {
19                     byte[] data = new byte[] { 0x00, 0x00, 0x00 };
20                     for (int k = 0; k < 24; k++)
21                     {
22                         if (((i * 24) + k) < bmp.Height)
23                         {
24                             pixelColor = bmp.GetPixel(j, (i * 24) + k);
25                             if (pixelColor.R == 0)
26                             {
27                                 data[k / 8] += (byte)(128 >> (k % 8));
28                             }
29                         }
30                     }
31                     all[i * (w + 2) + j + 2] = data;
32                 }
33                 //换行
34                 all[(i + 1) * (w + 2)] = PrinterCmdUtils.nextLine(1);
35             }
36             all[h * (w + 2) + 1] = PrinterCmdUtils.nextLine(2);
37
38             return byteMerger(all);
39         }

 1 public static byte[] byteMerger(byte[][] byteList)
 2         {
 3             int Length = 0;
 4             for (int i = 0; i < byteList.Length; i++)
 5             {
 6                 Length += byteList[i].Length;
 7             }
 8             byte[] result = new byte[Length];
 9
10             int index = 0;
11             for (int i = 0; i < byteList.Length; i++)
12             {
13                 byte[] nowByte = byteList[i];
14                 for (int k = 0; k < byteList[i].Length; k++)
15                 {
16                     result[index] = nowByte[k];
17                     index++;
18                 }
19             }
20             return result;
21         }