C# Serial串口打印

项目中需要使用串口热敏打印机，所以研究一下串口打印。

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;
using System.Collections;
using System.Windows.Forms;
using System.Drawing;

namespace PrinterTest
{
    public class Printer
    {
        private static SerialPort serialPort;   //串口

        public Printer()
        {
            try
            {
                //
                //串口初始化
                //
                serialPort = new SerialPort();
                serialPort.PortName = "COM2";
                serialPort.BaudRate = 9600;//波特率
                serialPort.Parity = System.IO.Ports.Parity.Odd;//奇校验
                serialPort.StopBits = System.IO.Ports.StopBits.One;//停止位
                OpenPort();
            }
            catch
            {
                 MessageBox.Show(e.ToString());
            }
        }

        private void OpenPort()
        {
            if (null != serialPort)
            {
                try
                {
                    if (!serialPort.IsOpen)
                        serialPort.Open();

                }
                catch
                {
                    MessageBox.Show(e.ToString());
                }
            }
        }

        private void ClosePort()
        {
            try
            {
                if (serialPort.IsOpen)
                    serialPort.Close();
                serialPort.Dispose();
            }
            catch
            {
                MessageBox.Show(e.ToString());
            }
        }

        public void Write(byte[] data,int len)
        {
            try
            {
                serialPort.Write(data, 0, len);
            }
            catch(Exception e)
            {
                MessageBox.Show(e.ToString());
            }
        }

        /// <summary>
        /// 向打印机发送命令
        /// </summary>
        /// <param name="data">命令数据</param>
        public void Write(params  byte[] data)
        {
            try
            {
                serialPort.Write(data, 0,data.Length );
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
            }
        }
        /// <summary>
        /// 发送字符串
        /// </summary>
        /// <param name="strBuf">要发送的字符串</param>
        public void Write(string strBuf)
        {
            try
            {
                byte[] data = ToHex(strBuf, "GB2312");
                serialPort.Write(data, 0, data.Length);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
            }
        }

        /// <summary>
        /// 根据编码方式转换字符串为byte[]
        /// </summary>
        /// <param name="str">目标字符串</param>
        /// <param name="charset">编码方式</param>
        /// <returns>转换后的byte[]</returns>
        private byte[] ToHex(string str, string charset)//
        {
            if (str.Length % 2 != 0)
                str += "";
            Encoding enc = Encoding.GetEncoding(charset);
            return enc.GetBytes(str);
        }

        /// <summary>
        /// 图片取模
        /// </summary>
        /// <param name="bmp"></param>
        /// <returns></returns>
        private byte[,] GetBytesByBMP(Bitmap bmp)
        {
            //bitArray存储像素点
            bool[,] bitArray = new bool[bmp.Height % 8 == 0 ?
                bmp.Height : (bmp.Height / 8 + 1) * 8, bmp.Width];

            for (int i = 0; i < bmp.Width; ++i)//获取图片点阵
            {
                for (int j = 0; j < bmp.Height; ++j)
                {
                    //获取点的ARGB
                    Color pixel = bmp.GetPixel(i, j);

                    double gray = pixel.R * 0.299 +
                        pixel.G * 0.587 + pixel.B * 0.114;
                    if (gray < 192)//是深色
                        bitArray[j, i] = true;
                    else //非深色(浅色)
                        bitArray[j, i] = false;
                }
            }

            byte[,] res =//存储字模
                new byte[bitArray.GetLength(0) / 8, bitArray.GetLength(1)];
            int resRow = 0, resCol = 0;
            for (int i = 0; i < bmp.Height; i = i + 8)
            {
                resCol = 0;
                for (int j = 0; j < bmp.Width; ++j)
                {
                    byte b = 0;
                    //二进制转十进制
                    for (int k = (i + 7), p = 0; k > i - 1; --k)
                    {
                        b += (byte)((bitArray[k, j] ? 1 : 0) *
                            Math.Pow(2, p++));
                    }
                    res[resRow, resCol++] = b;

                }
                ++resRow;
            }

            return res;
        }
        /// <summary>
        /// 打印图片
        /// </summary>
        /// <param name="bmp">图片</param>
        /// <param name="enlarge">放大倍数</param>
        public void printImage(Bitmap bmp)
        {
            byte[,] gImage = GetBytesByBMP(bmp);

            for (int i = gImage.GetLength(0) - 1; i >= 0; --i)
            {
                byte lowLen = (byte)((gImage.GetLength(1) << 8) >> 8);
                byte highLen = (byte)(gImage.GetLength(1) >> 8);

                Write(0x1B, 0x4B, lowLen, highLen);
                for (int j = 0; j < gImage.GetLength(1); j++)
                    Write(gImage[i, j]);
                Write(0x0D);
            }
        }
    }
}

调用方法：

Printer p = new Printer();//生成实例
p.Write(myArray,myArray.Lenth);发送定长数组
p.Write(0x1B, 0x40);//发送不定长数字串
p.Write("发送字符串 Send String");//发送字符串
p.printImage(new Bitmap());//发送图片