如何將條碼掃描器整合到Web應用程式中

建立條碼掃描Web應用程式

在本節中，我們將示範如何使用IronBarcode構建一個將掃描條碼並顯示結果的Web應用程式。

1. 如下圖所示，首先在Visual Studio中建立一個新的ASP.NET Web應用程式專案。

   

   

2. 使用NuGet包管理控制台安裝IronBarcode。

   為此，開啟NuGet包管理控制台，並運行以下命令以安裝IronBarcode：

   Install-Package BarCode

   您也可以從NuGet網站直接下載包。

3. 完成安裝後，開啟Default.aspx檔案，並用您的前端程式碼替換。 這將建立一個檔案上傳按鈕、一個帶有"掃描條碼"文字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. 現在我們將編寫後端程式碼，該程式碼將獲取上傳的圖片，掃描其中的QR碼或條碼，並顯示結果。

   開啟Default.aspx.cs檔案，並將現有程式碼替換為以下程式碼：

   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. 現在我們的專案已完成，可以運行它並開啟一個網頁在以下URL "https://localhost:44335/Default"。

   

6. 按下選擇檔案按鈕並上傳包含QR碼的圖片。

   

7. 最後，按下掃描條碼按鈕； 結果將顯示在按鈕下方。

   

以上是建立具有條碼掃描功能的網頁的所有步驟。 現在您將能夠線上讀取條碼，並且可以輕鬆地使用IronBarcode整合整合到您的Web應用程式中。