How to Integrate Barcode Scanner into Web Application

创建条码扫描 Web 应用程序

在本节中，我们将展示如何使用 IronBarcode 构建一个扫描条码并显示结果的 Web 应用程序。

1. 首先根据下图在 Visual Studio 中创建一个新的 ASP.NET Web 应用程序项目。

2. 使用 NuGet 包管理器控制台安装 IronBarcode。

   为此，请打开 NuGet 包管理器控制台并运行以下命令来安装 IronBarcode：

   Install-Package BarCode

   您也可以直接从NuGet 网站下载该包。

3. 安装完成后，打开Default.aspx文件并用您的前端代码替换。 这将创建一个文件上传按钮，一个带有"扫描条码"字样的按钮，以及一个显示结果的标签。

   <%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication6._Default" %>
   
   <asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
       <div><br /><br /><br />
           <asp:FileUpload ID="fileUpload" runat="server" />
           <br />
           <asp:Button ID="btnScan" runat="server" Text="Scan Barcode" OnClick="btnScan_Click" />
           <br />
           <asp:Label ID="lblResult" runat="server"></asp:Label>
       </div>
   </asp:Content>

   <%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication6._Default" %>
   
   <asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
       <div><br /><br /><br />
           <asp:FileUpload ID="fileUpload" runat="server" />
           <br />
           <asp:Button ID="btnScan" runat="server" Text="Scan Barcode" OnClick="btnScan_Click" />
           <br />
           <asp:Label ID="lblResult" runat="server"></asp:Label>
       </div>
   </asp:Content>

   HTML

4. 现在我们将编写后端代码，从而获取上传的图像，扫描 QR 代码或条码，并显示结果。

   打开Default.aspx.cs文件并用以下代码替换现有代码：

   using IronBarCode;
   using System;
   using System.IO;
   
   public partial class _Default : System.Web.UI.Page
   {
       // Event handler for the 'Scan Barcode' button click
       protected void btnScan_Click(object sender, EventArgs e)
       {
           try
           {
               // Ensure a file has been uploaded
               if (fileUpload.HasFile)
               {
                   // Get the uploaded file stream
                   Stream stream = fileUpload.PostedFile.InputStream;
   
                   // Use IronBarcode to read the barcode from the stream
                   var barcodeResults = BarcodeReader.Read(stream);
   
                   // Display the scanned barcode result
                   lblResult.Text = "Scanned Barcode: " + barcodeResults;
               }
               else
               {
                   lblResult.Text = "Please upload an image.";
               }
           }
           catch (Exception ex)
           {
               // Display any errors that occur during the scanning process
               lblResult.Text = "Error: " + ex.Message;
           }
       }
   }

   using IronBarCode;
   using System;
   using System.IO;
   
   public partial class _Default : System.Web.UI.Page
   {
       // Event handler for the 'Scan Barcode' button click
       protected void btnScan_Click(object sender, EventArgs e)
       {
           try
           {
               // Ensure a file has been uploaded
               if (fileUpload.HasFile)
               {
                   // Get the uploaded file stream
                   Stream stream = fileUpload.PostedFile.InputStream;
   
                   // Use IronBarcode to read the barcode from the stream
                   var barcodeResults = BarcodeReader.Read(stream);
   
                   // Display the scanned barcode result
                   lblResult.Text = "Scanned Barcode: " + barcodeResults;
               }
               else
               {
                   lblResult.Text = "Please upload an image.";
               }
           }
           catch (Exception ex)
           {
               // Display any errors that occur during the scanning process
               lblResult.Text = "Error: " + ex.Message;
           }
       }
   }

   Imports IronBarCode
   Imports System
   Imports System.IO
   
   Partial Public Class _Default
   	Inherits System.Web.UI.Page
   
   	' Event handler for the 'Scan Barcode' button click
   	Protected Sub btnScan_Click(ByVal sender As Object, ByVal e As EventArgs)
   		Try
   			' Ensure a file has been uploaded
   			If fileUpload.HasFile Then
   				' Get the uploaded file stream
   				Dim stream As Stream = fileUpload.PostedFile.InputStream
   
   				' Use IronBarcode to read the barcode from the stream
   				Dim barcodeResults = BarcodeReader.Read(stream)
   
   				' Display the scanned barcode result
   				lblResult.Text = "Scanned Barcode: " & barcodeResults
   			Else
   				lblResult.Text = "Please upload an image."
   			End If
   		Catch ex As Exception
   			' Display any errors that occur during the scanning process
   			lblResult.Text = "Error: " & ex.Message
   		End Try
   	End Sub
   End Class

   $vbLabelText   $csharpLabel
5. 项目完成后，我们可以运行它并在以下 URL 打开网页"https://localhost:44335/Default"。

6. 点击选择文件按钮，上传包含 QR 码的图像。

7. 最后，点击扫描条码按钮； 它将在按钮下显示输出。

以上是创建具有条码扫描功能的网页的所有步骤。 现在您将能够在线读取条码，并可使用 IronBarcode 轻松与您的 Web 应用程序集成。