如何使用 .NET MAUI 進行 QR Code 掃描器

         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

using IronQrCode;
using Microsoft.Maui.Controls;
using Microsoft.Maui.Essentials;

namespace MauiQRCodeScanner;

public partial class MainPage : ContentPage
{
    public MainPage()
    {
    License.LicenseKey = "Your key";
        InitializeComponent();
    }

// OnScanButtonClicked method with object sender as input
    private async void OnScanButtonClicked(object sender, EventArgs e)
    {
        // Check for camera permission for var barcode with clear and valid reason
        var status = await Permissions.RequestAsync<Permissions.Camera>();
        if (status != PermissionStatus.Granted)
        {
            await DisplayAlert("Permission Denied", "Cannot scan QR codes without camera permission", "OK");
            return;
        }

        // Start scanning QR codes
        try
{
        var images = await FilePicker.Default.PickAsync(new PickOptions
        {
           PickerTitle = "Pick image",
          FileTypes = FilePickerFileType.Images
        });
        var imageSource = images.FullPath.ToString();
        // barcodeImage.Source = imageSource;

        var inputBmp = AnyBitmap.FromFile(imageSource);
        // Load the asset into QrImageInput
        QrImageInput imageInput = new QrImageInput(inputBmp);

        // Create a QR Reader object
        QrReader reader = new QrReader();

        // Read the input and get all embedded QR Codes
        IEnumerable<QrResult> results = reader.Read(imageInput);

        if (results.Any())
        {
            resultLabel.Text = "Scanned Text: " + results.First().Value; 
            // Display the result
        }
        else
        {
            resultLabel.Text = "No QR code detected";
        }
    }
    catch (Exception ex)
    {
           resultLabel.Text = "Error: " + ex.Message;
    }
    }
}

using IronQrCode;
using Microsoft.Maui.Controls;
using Microsoft.Maui.Essentials;

namespace MauiQRCodeScanner;

public partial class MainPage : ContentPage
{
    public MainPage()
    {
    License.LicenseKey = "Your key";
        InitializeComponent();
    }

// OnScanButtonClicked method with object sender as input
    private async void OnScanButtonClicked(object sender, EventArgs e)
    {
        // Check for camera permission for var barcode with clear and valid reason
        var status = await Permissions.RequestAsync<Permissions.Camera>();
        if (status != PermissionStatus.Granted)
        {
            await DisplayAlert("Permission Denied", "Cannot scan QR codes without camera permission", "OK");
            return;
        }

        // Start scanning QR codes
        try
{
        var images = await FilePicker.Default.PickAsync(new PickOptions
        {
           PickerTitle = "Pick image",
          FileTypes = FilePickerFileType.Images
        });
        var imageSource = images.FullPath.ToString();
        // barcodeImage.Source = imageSource;

        var inputBmp = AnyBitmap.FromFile(imageSource);
        // Load the asset into QrImageInput
        QrImageInput imageInput = new QrImageInput(inputBmp);

        // Create a QR Reader object
        QrReader reader = new QrReader();

        // Read the input and get all embedded QR Codes
        IEnumerable<QrResult> results = reader.Read(imageInput);

        if (results.Any())
        {
            resultLabel.Text = "Scanned Text: " + results.First().Value; 
            // Display the result
        }
        else
        {
            resultLabel.Text = "No QR code detected";
        }
    }
    catch (Exception ex)
    {
           resultLabel.Text = "Error: " + ex.Message;
    }
    }
}

Imports IronQrCode
Imports Microsoft.Maui.Controls
Imports Microsoft.Maui.Essentials

Namespace MauiQRCodeScanner

	Partial Public Class MainPage
		Inherits ContentPage

		Public Sub New()
		License.LicenseKey = "Your key"
			InitializeComponent()
		End Sub

	' OnScanButtonClicked method with object sender as input
		Private Async Sub OnScanButtonClicked(ByVal sender As Object, ByVal e As EventArgs)
			' Check for camera permission for var barcode with clear and valid reason
			Dim status = Await Permissions.RequestAsync(Of Permissions.Camera)()
			If status <> PermissionStatus.Granted Then
				Await DisplayAlert("Permission Denied", "Cannot scan QR codes without camera permission", "OK")
				Return
			End If

			' Start scanning QR codes
			Try
			Dim images = Await FilePicker.Default.PickAsync(New PickOptions With {
				.PickerTitle = "Pick image",
				.FileTypes = FilePickerFileType.Images
			})
			Dim imageSource = images.FullPath.ToString()
			' barcodeImage.Source = imageSource;

			Dim inputBmp = AnyBitmap.FromFile(imageSource)
			' Load the asset into QrImageInput
			Dim imageInput As New QrImageInput(inputBmp)

			' Create a QR Reader object
			Dim reader As New QrReader()

			' Read the input and get all embedded QR Codes
			Dim results As IEnumerable(Of QrResult) = reader.Read(imageInput)

			If results.Any() Then
				resultLabel.Text = "Scanned Text: " & results.First().Value
				' Display the result
			Else
				resultLabel.Text = "No QR code detected"
			End If
		Catch ex As Exception
			   resultLabel.Text = "Error: " & ex.Message
		End Try
		End Sub
	End Class
End Namespace