如何將條碼掃描器集成到Web應用程式中

創建條碼掃描網頁應用程式

在本節中，我們將展示如何使用 IronBarcode 構建一個網頁應用程式來掃描條碼並顯示結果。

1. 首先在 Visual Studio 中創建一個新的 ASP.NET 網頁應用程式項目，如下圖所示。

   

   

2. 使用 NuGet Package Manager Console 安裝 IronBarcode。

   為此，打開 NuGet Package Manager Console 並運行以下命令來安裝 IronBarcode：

   Install-Package BarCode

   您也可以直接從 NuGet 網站下載該包。

3. 安裝完成後，打開 Default.aspx 文件，並用您的前端代碼替換它。 這將創建一個文件上傳按鈕、一個文本為“掃描條碼”的按鈕以及一個顯示結果的標籤。

   <%@ 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. 現在我們將撰寫後端代碼來獲取上傳的圖片，掃描其中的 QR 碼或條碼，並顯示結果。

   打開 Default.aspx.cs 文件，並將現有代碼替換為以下代碼：

   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. 現在我們的項目已完成，我們可以運行它，並在以下 URL "https://localhost:44335/Default" 打開一個網頁。

   

6. 點擊選擇文件按鈕，並上傳包含 QR 碼的圖片。

   

7. 最後，點擊掃描條碼按鈕； 它會在按鈕下方顯示輸出。

   

以上是創建具有條碼掃描功能的網頁的所有步驟。 現在，您可以在線閱讀條碼，並且可以輕鬆地將其集成到您的網頁應用程式中使用 IronBarcode。