在 C# 中创建 Code128 条形码

Question

愚蠢的我，我以为，只要用条形码字体写一些文本，就会让扫描仪读取它。看来我错了。

所以在阅读了一些关于 code128 条形码的文档后，我了解到：

条形码以（103、104 或 105 取决于类型）开头
然后是字符串本身
然后是字符串中每个字符的计算总和乘以其位置的模103
然后追加106

我的代码是：

public string Str = "MADS";
public string Barcode = null;

public void OnGet()
{

    int start = 104;
    int end = 106;
    int calc = start;
    Barcode = start.ToString();
    for (var i = 0; i < Str.Length; i++)
    {
        calc += (Convert.ToChar(Str[i]) - 32) * (i + 1);
        Barcode += Str[i];
    }

    double rem = calc % 103;
    Barcode += Convert.ToChar((int)rem + 32).ToString() + end;

    Console.WriteLine(Barcode);

}

我不确定要在条码字符串中包含多少，以便扫描器读取它？:

MADS,
104MADS,
104MADS,106

还是我理解错了？

我的参考文献是：

Link 1 Link 2

特别是 "Link 1"，因为我已经用扫描仪测试了该结果，并且有效。遗憾的是我无法让我的输出看起来像那样。

结论

阅读评论和答案后，我认为对我来说最好的方法是使用现有的库。

我选择 NetBarcode GitHub link 因为它与 .Net Core 兼容。

Answer 1

检查这个库：https://github.com/barnhill/barcodelib

在 Nuget 上：https://github.com/barnhill/barcodelib

它将生成一个图像，其中包含读取为输入文本的条形码。使用示例：

BarcodeLib.Barcode b = new BarcodeLib.Barcode();
Image img = b.Encode(BarcodeLib.TYPE.CODE128, "038000356216", Color.Black, Color.White, 290, 120);

Answer 2

如果您使用的是条形码字体，则需要在发送到输出的字符串中包含开始字符、数据字符串、校验和和停止字符，因此示例中的最后一个字符是正确的。该字体只查找每个符号并为您绘制条形和空格。它对条形码符号系统一无所知并自行规则。

var buttonGen = document.getElementById("btnGen");
buttonGen.onclick = function () {
  var x = document.getElementById("textIn").value;
  var i, j, intWeight, intLength, intWtProd = 0, arrayData = [], fs;
  var arraySubst = [ "Ã", "Ä", "Å", "Æ", "Ç", "È", "É", "Ê" ];

/*
 * Checksum Calculation for Code 128 B
 */
  intLength = x.length;
 arrayData[0] = 104; // Assume Code 128B, Will revise to support A, C and switching.
 intWtProd = 104;
 for (j = 0; j < intLength; j += 1) {
   arrayData[j + 1] = x.charCodeAt(j) - 32; // Have to convert to Code 128 encoding
   intWeight = j + 1; // to generate the checksum
   intWtProd += intWeight * arrayData[j + 1]; // Just a weighted sum
 }
 arrayData[j + 1] = intWtProd % 103; // Modulo 103 on weighted sum
 arrayData[j + 2] = 106; // Code 128 Stop character
  chr = parseInt(arrayData[j + 1], 10); // Gotta convert from character to a number
  if (chr > 94) {
    chrString = arraySubst[chr - 95];
  } else {
    chrString = String.fromCharCode(chr + 32);
  }
  
  // Change the font-size style to match the drop down
  fs = document.getElementsByTagName("option")[document.getElementById("selList").selectedIndex].value;
  document.getElementById("test").style.fontSize = fs  + 'px';
  
  document.getElementById("check").innerHTML =
    'Checksum = ' + chr + ' or character ' + // Make It Visual
    chrString + ', for text = "' + x + '"';
  
  document.getElementById("test").innerHTML =
    'Ì' + // Start Code B
    x + // The originally typed string
    chrString + // The generated checksum
    'Î'; // Stop Code
}

<html>
  <head>
    <link href="https://fonts.googleapis.com/css?family=Libre+Barcode+128+Text" rel="stylesheet">
    <style>
      td, th {
        text-align: center;
        padding: 6px;
      }

      .ss {
        font-family: 'Libre Barcode 128 Text', cursive;
        font-size: 24px;
      }
    </style>
  </head>
  <body>
    &nbsp;Font Size:&nbsp;
    <select id="selList">
      <option value="24" selected>24px</option>
      <option value="30">30px</option>
      <option value="36">36px</option>
      <option value="42">42px</option>
      <option value="48">48px</option>
      <option value="54">54px</option>
      <option value="60">60px</option>
      <option value="66">66px</option>
      <option value="72">72px</option>
      <option value="78">78px</option>
      <option value="84">84px</option>
      <option value="90">90px</option>
      <option value="96">96px</option>
    </select>&nbsp;

    <input type="text" id="textIn"></input>
    <input type="button" id="btnGen" value="Generate Code 128 Checksum" tabindex=4/>
    <div id="check"></div><br /><span id="test" class="ss">ÌMaking the Web Beautiful!$Î</span><br />
    <p>This is a demonstration of use of the Libre Barcode 128 Font.</p>
    <p>Because the Libre Barcode Code 128 font does not generate checksums, you need this component to produce a scanning barcode.</p>
    <p>To use, just enter the text you want to embed in the barcode and press the generate button. Happy barcoding!</p>
    <p>By the way, Libre Barcode 128 Font uses the following high ASCII / unicode characters to implement the control codes symbols. (This is essentially adding 100 to the value, in other words 'Ã' is U+00C3 (195) to 'Î' is U+00CE (206).)</p>
<table border="3">
    <tr>
    <th>Value</th>
    <th>Encoding</th>
    <th>Subst</th>
  </tr>
<tr><td> 95</td><td>A: US, B: DEL, C: 95</td><td>Ã</td></tr>
<tr><td> 96</td><td>A: FNC 3, B: FNC 3, C: 96</td><td>Ä</td></tr>
<tr><td> 97</td><td>A: FNC 2, B: FNC 2, C: 97</td><td>Å</td></tr>
<tr><td> 98</td><td>A: Shift B, B: Shift A, C: 98</td><td>Æ</td></tr>
<tr><td> 99</td><td>A: Code C, B: Code C, C: 99</td><td>Ç</td></tr>
<tr><td>100</td><td>A: Code B, B: FNC 4, C: Code B</td><td>È</td></tr>
<tr><td>101</td><td>A: FNC 4, B: Code A, C: Code A</td><td>É</td></tr>
<tr><td>102</td><td>A: FNC 1, B: FNC 1, C: FNC 1</td><td>Ê</td></tr>
<tr><td>103</td><td>Begin Code A</td><td>Ë</td></tr>
<tr><td>104</td><td>Begin Code B</td><td>Ì</td></tr>
<tr><td>105</td><td>Begin Code C</td><td>Í</td></tr>
<tr><td>106</td><td>Stop Code</td><td>Î</td></tr></table>
  </body>
</html>

在 C# 中创建 Code128 条形码

Creating Code128 barcode in C#

c#

asp.net-core

barcode

code128