关于生成\读取一维码二维码的方法

水深无声 2022-06-14 01:38 413阅读 0赞

**一、首先下载 ZXing.Net**

地址是：[http://zxingnet.codeplex.com/releases/view/117068][http_zxingnet.codeplex.com_releases_view_117068]

然后将对应版本 .dll 拖入项目中，再引用之。

主要是用 BarcodeWriter、BarcodeReader。

**二、生成二维码**

.NET 平台的代码始终要简单些。

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      <code>QrCodeEncodingOptions options =</code> 
      <code>new</code> 
      <code>QrCodeEncodingOptions();</code> 
     </div> 
     <div> 
      <code>options.CharacterSet =</code> 
      <code>"UTF-8"</code> 
      <code>;</code> 
     </div> 
     <div> 
      <code>options.DisableECI =</code> 
      <code>true</code> 
      <code>; </code> 
      <code>// Extended Channel Interpretation (ECI) 主要用于特殊的字符集。并不是所有的扫描器都支持这种编码。</code> 
     </div> 
     <div> 
      <code>options.ErrorCorrection = ZXing.QrCode.Internal.ErrorCorrectionLevel.H;</code> 
      <code>// 纠错级别</code> 
     </div> 
     <div> 
      <code>options.Width = 300;</code> 
     </div> 
     <div> 
      <code>options.Height = 300;</code> 
     </div> 
     <div> 
      <code>options.Margin = 1;</code> 
     </div> 
     <div> 
      <code>// options.Hints，更多属性，也可以在这里添加。</code> 
     </div> 
     <div>
       &nbsp; 
     </div> 
     <div> 
      <code>BarcodeWriter writer =</code> 
      <code>new</code> 
      <code>BarcodeWriter();</code> 
     </div> 
     <div> 
      <code>writer.Format = BarcodeFormat.QR_CODE;</code> 
     </div> 
     <div> 
      <code>writer.Options = options;</code> 
     </div> 
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       &nbsp; 
     </div> 
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      <code>Response.Clear();</code> 
     </div> 
     <div> 
      <code>using</code> 
      <code>(Bitmap bmp = writer.Write(</code> 
      <code>"<a href="http://www.cftea.com" rel="nofollow">http://www.cftea.com</a>"</code> 
      <code>)) // Write 具备生成、写入两个功能</code> 
     </div> 
     <div> 
      <code>{ </code> 
     </div> 
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      <code>&nbsp;</code> 
      <code>MemoryStream ms =</code> 
      <code>new</code> 
      <code>MemoryStream();</code> 
     </div> 
     <div> 
      <code>&nbsp;</code> 
      <code>{ </code> 
     </div> 
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      <code>&nbsp;&nbsp;</code> 
      <code>bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);</code> 
     </div> 
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       &nbsp; 
     </div> 
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      <code>&nbsp;&nbsp;</code> 
      <code>Response.ContentType =</code> 
      <code>"image/png"</code> 
      <code>;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;</code> 
      <code>Response.BinaryWrite(ms.ToArray());</code> 
     </div> 
     <div> 
      <code>&nbsp;</code> 
      <code>}</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
     <div> 
      <code>Response.End();</code> 
     </div> 
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**纠错级别：**

1.      L - 约 7% 纠错能力。
2.      M - 约 15% 纠错能力。
3.      Q - 约 25% 纠错能力。
4.      H - 约 30% 纠错能力。

**三、生成条形码**

[?][Link 1]

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      <code>QrCodeEncodingOptions options =</code> 
      <code>new</code> 
      <code>QrCodeEncodingOptions();</code> 
     </div> 
     <div> 
      <code>options.CharacterSet =</code> 
      <code>"UTF-8"</code> 
      <code>;</code> 
     </div> 
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      <code>options.Width = 300;</code> 
     </div> 
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      <code>options.Height = 50;</code> 
     </div> 
     <div> 
      <code>options.Margin = 1;</code> 
     </div> 
     <div> 
      <code>options.PureBarcode =</code> 
      <code>false</code> 
      <code>; </code> 
      <code>// 是否是纯码，如果为 false，则会在图片下方显示数字</code> 
     </div> 
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       &nbsp; 
     </div> 
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      <code>BarcodeWriter writer =</code> 
      <code>new</code> 
      <code>BarcodeWriter();</code> 
     </div> 
     <div> 
      <code>writer.Format = BarcodeFormat.CODE_128;</code> 
     </div> 
     <div> 
      <code>writer.Options = options;</code> 
     </div> 
     <div>
       &nbsp; 
     </div> 
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      <code>Response.Clear();</code> 
     </div> 
     <div> 
      <code>using</code> 
      <code>(Bitmap bmp = writer.Write(</code> 
      <code>"12345678"</code> 
      <code>))</code> 
     </div> 
     <div> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;</code> 
      <code>MemoryStream ms =</code> 
      <code>new</code> 
      <code>MemoryStream();</code> 
     </div> 
     <div> 
      <code>&nbsp;</code> 
      <code>{ </code> 
     </div> 
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      <code>&nbsp;&nbsp;</code> 
      <code>bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);</code> 
     </div> 
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       &nbsp; 
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      <code>&nbsp;&nbsp;</code> 
      <code>Response.ContentType =</code> 
      <code>"image/png"</code> 
      <code>;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;</code> 
      <code>Response.BinaryWrite(ms.ToArray());</code> 
     </div> 
     <div> 
      <code>&nbsp;</code> 
      <code>}</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
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      <code>Response.End();</code> 
     </div> 
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**四、识别二维码、条形码**

[?][Link 1]

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      <code>BarcodeReader reader =</code> 
      <code>new</code> 
      <code>BarcodeReader();</code> 
     </div> 
     <div> 
      <code>reader.Options.CharacterSet =</code> 
      <code>"UTF-8"</code> 
      <code>;</code> 
     </div> 
     <div> 
      <code>using</code> 
      <code> (Bitmap bmp = </code> 
      <code>new</code> 
      <code> Bitmap(</code> 
      <code>"D:\\qr.png"</code> 
      <code>))</code> 
     </div> 
     <div> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;</code> 
      <code>Result result = reader.Decode(bmp);</code> 
     </div> 
     <div> 
      <code>&nbsp;</code> 
      <code>Response.Write(result.Text);</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
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</table>

**总结**

好了，以上就是这篇文章的全部内容了，如果要改变背景颜色、画头像，可以直接在 Bitmap 中画，希望本文的内容对大家的学习或者工作能带来一定的帮助

[http_zxingnet.codeplex.com_releases_view_117068]: http://zxingnet.codeplex.com/releases/view/117068
[Link 1]: http://www.jb51.net/article/99312.htm#