Code128 条码生成

//
// =================================================
// 条码打印
//
// 设计: 陈炎和 2011.03
//==================================================
//
//BarCode128有三种不同的版本：A（数字、大写字母、控制字符）B（数字、大小字母、字符）C（双位数字）
//本程序只处理B、C,BarCode128由码头、码身、码检、码尾组成,
//
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace cyh.General
{
/// <summary>
/// 生成条码打印类
/// </summary>
public class BarCode128
{
//ASCII从32到127对应的条码区,由3个条、3个空、共11个单元构成,符号内含校验码
private string[] Code128Encoding = new string[] {
"11011001100", "11001101100", "11001100110", "10010011000", "10010001100", "10001001100", "10011001000", "10011000100", "10001100100", "11001001000",
"11001000100", "11000100100", "10110011100", "10011011100", "10011001110", "10111001100", "10011101100", "10011100110", "11001110010", "11001011100",
"11001001110", "11011100100", "11001110100", "11101101110", "11101001100", "11100101100", "11100100110", "11101100100", "11100110100", "11100110010",
"11011011000", "11011000110", "11000110110", "10100011000", "10001011000", "10001000110", "10110001000", "10001101000", "10001100010", "11010001000",
"11000101000", "11000100010", "10110111000", "10110001110", "10001101110", "10111011000", "10111000110", "10001110110", "11101110110", "11010001110",
"11000101110", "11011101000", "11011100010", "11011101110", "11101011000", "11101000110", "11100010110", "11101101000", "11101100010", "11100011010",
"11101111010", "11001000010", "11110001010", "10100110000", "10100001100", "10010110000", "10010000110", "10000101100", "10000100110", "10110010000",
"10110000100", "10011010000", "10011000010", "10000110100", "10000110010", "11000010010", "11001010000", "11110111010", "11000010100", "10001111010",
"10100111100", "10010111100", "10010011110", "10111100100", "10011110100", "10011110010", "11110100100", "11110010100", "11110010010", "11011011110",
"11011110110", "11110110110", "10101111000", "10100011110", "10001011110", "10111101000", "10111100010", "11110101000", "11110100010", "10111011110",
"10111101110", "11101011110", "11110101110", "11010000100", "11010010000", "11010011100"
};
private const string Code128Stop = "11000111010", Code128End = "11"; //固定码尾
private enum Code128ChangeModes { CodeA = 101, CodeB = 100, CodeC = 99 }; //变更
private enum Code128StartModes { CodeUnset = 0, CodeA = 103, CodeB = 104, CodeC = 105 };//各类编码的码头

/// <summary>
/// 绘制Code128码(以像素为单位)
/// </summary>
public int EncodeBarcode(string code, System.Drawing.Graphics g, int x, int y, int width, int height, bool showText)
{
if (string.IsNullOrEmpty(code)) new Exception("条码不能为空");
List<int> encoded = CodetoEncoded(code); //1.拆分转义
encoded.Add(CheckDigitCode128(encoded)); //2.加入校验码
string encodestring = EncodeString(encoded); //3.编码

if (showText) //计算文本的大小,字体占图像的1/4高
{
Font font = new System.Drawing.Font("宋体", height/5F, System.Drawing.FontStyle.Regular, GraphicsUnit.Pixel, ((byte)(0)));
SizeF size = g.MeasureString(code, font);
height = height - (int)size.Height;
g.DrawString(code, font, System.Drawing.Brushes.Black, x, y + height);
int w = DrawBarCode(g, encodestring, x, y, width, height); //4.绘制
return ((int)size.Width > w ? (int)size.Width : w);
}
else
return DrawBarCode(g, encodestring, x, y, width, height); //4.绘制
}

//1.检测并将字符串拆分并加入码头
private List<int> CodetoEncoded(string code)
{
List<int> encoded = new List<int>();
int type = 0;//2:B类,3:C类
for (int i = 0; code.Length > 0; i++)
{
int k = isNumber(code);
if (k >= 4) //连续偶个数字可优先使用C类(其实并不定要转C类，但能用C类时条码会更短)
{
if (type == 0) encoded.Add((int)Code128StartModes.CodeC); //加入码头
else if (type != 3) encoded.Add((int)(Code128ChangeModes.CodeC)); //转义
type = 3;
for (int j = 0; j < k; j = j + 2) //两位数字合为一个码身
{
encoded.Add(Int32.Parse(code.Substring(0, 2)));
code = code.Substring(2);
}
}
else
{
if ((int)code[0] < 32 || (int)code[0] > 126) throw new Exception("字符串必须是数字或字母");
if (type == 0) encoded.Add((int)Code128StartModes.CodeB); //加入码头
else if (type != 2) encoded.Add((int)(Code128ChangeModes.CodeB)); //转义
type = 2;
encoded.Add((int)code[0] - 32);//字符串转为ASCII-32
code = code.Substring(1);
}
}
return encoded;
}
//2.校验码
private int CheckDigitCode128(List<int> encoded)
{
int check = encoded[0];
for (int i = 1; i < encoded.Count; i++)
check = check + (encoded[i] * i);
return (check % 103);
}

//2.编码(对应Code128Encoding数组)
private string EncodeString(List<int> encoded)
{
string encodedString = "";
for (int i = 0; i < encoded.Count; i++)
{
encodedString += Code128Encoding[encoded[i]];
}
encodedString += Code128Stop + Code128End; // 加入结束码
return encodedString;
}

//4.绘制条码(返回实际图像宽度)
private int DrawBarCode(System.Drawing.Graphics g, string encodeString, int x, int y, int width, int height)
{
int w = width / encodeString.Length;
for (int i = 0; i < encodeString.Length; i++)
{
g.FillRectangle(encodeString[i] == '0' ? System.Drawing.Brushes.White : System.Drawing.Brushes.Black, x, y, w, height);
x += w;
}
return w * (encodeString.Length+2);
}
//检测是否连续偶个数字,返回连续数字的长度
private int isNumber(string code)
{
int k = 0;
for (int i = 0; i < code.Length; i++)
{
if (char.IsNumber(code[i]))
k++;
else
break;
}
if (k % 2 != 0) k--;
return k;
}

/// <summary>
/// 绘制Code128码到图片
/// </summary>
public Image EncodeBarcode(string code, int width, int height, bool showText)
{
Bitmap image = new Bitmap(width, height);
using (Graphics g = Graphics.FromImage(image))
{
g.Clear(Color.White);
int w = EncodeBarcode(code, g, 0, 0, width, height, showText);

Bitmap image2 = new Bitmap(w, height); //剪切多余的空白;
using (Graphics g2 = Graphics.FromImage(image2))
{
g2.DrawImage(image, 0, 0);
return image2;
}

}

}
/// <summary>
/// 绘制Code128码到流
/// </summary>
public byte[] EncodeBarcodeByte(string code, int width, int height, bool showText)
{
Image image = EncodeBarcode(code, width, height, showText);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
byte[] byteImage = ms.ToArray();
ms.Close();
image.Dispose();
return byteImage;

}
}
}