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Camera.MAUI.ZXing 1.0.0

Camera.MAUI/Camera.MAUI.ZXing

A Camera View control and a Barcode Endode/Decode control (based on ZXing.Net) for .NET MAUI applications.

CameraView

A ContetView control for camera management with the next properties:

Install and configure CameraView

1. Download and Install Camera.MAUI NuGet package on your application.

2. Download and Install Camera.MAUI.ZXing NuGet package on your application (if you want Barcode detection/decode with ZXing).

3. Initialize the plugin in your MauiProgram.cs:

   // Add the using to the top
   using Camera.MAUI;
   
   public static MauiApp CreateMauiApp()
   {
   	var builder = MauiApp.CreateBuilder();
   
   	builder
   		.UseMauiApp<App>()
   		.UseMauiCameraView(); // Add the use of the plugging
   
   	return builder.Build();
   }
   

4. Add camera/microphone permissions to your application:

Android

In your AndroidManifest.xml file (Platforms\Android) add the following permission:

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.RECORD_VIDEO" />

iOS/MacCatalyst

In your info.plist file (Platforms\iOS / Platforms\MacCatalyst) add the following permission:

<key>NSCameraUsageDescription</key>
<string>This app uses camera for...</string>
<key>NSMicrophoneUsageDescription</key>
<string>This app needs access to the microphone for record videos</string>

Make sure that you enter a clear and valid reason for your app to access the camera. This description will be shown to the user.

Windows

In your Package.appxmanifest file (Platforms\Windows) go to Capabilities and mark Web Camera and Microphone.

For more information on permissions, see the Microsoft Docs.

Using CameraView

In XAML, make sure to add the right XML namespace:

xmlns:cv="clr-namespace:Camera.MAUI;assembly=Camera.MAUI"

Use the control:

<cv:CameraView x:Name="cameraView" WidthRequest="300" HeightRequest="200"/>

Configure the events:

 cameraView.CamerasLoaded += CameraView_CamerasLoaded;
 cameraView.BarcodeDetected += CameraView_BarcodeDetected;

Configure the camera and microphone to use:

 private void CameraView_CamerasLoaded(object sender, EventArgs e)
 {
 if (cameraView.NumCamerasDetected > 0)
 {
 if (cameraView.NumMicrophonesDetected > 0)
 cameraView.Microphone = cameraView.Microphones.First();
 cameraView.Camera = cameraView.Cameras.First();
 MainThread.BeginInvokeOnMainThread(async () =>
 {
 if (await cameraView.StartCameraAsync() == CameraResult.Success)
 {
 controlButton.Text = "Stop";
 playing = true;
 }
 });
 }
 }

CameraInfo type (Camera Property): CameraInfo has the next properties:

 public string Name
 public string DeviceId
 public CameraPosition Position
 public bool HasFlashUnit
 public float MinZoomFactor
 public float MaxZoomFactor
 public float HorizontalViewAngle
 public float VerticalViewAngle
 public List<Size> AvailableResolutions

Start camera playback:

 if (await cameraView.StartCameraAsync(new Size(1280, 720)) == CameraResult.Success)
 {
 playing = true;
 }

Stop camera playback:

 if (await cameraView.StopCameraAsync() == CameraResult.Success)
 {
 playing = false;
 }

Set Flash mode

cameraView.FlashMode = FlashMode.Auto;

Toggle Torch

cameraView.TorchEnabled = !cameraView.TorchEnabled;

Set mirrored mode

cameraView.MirroredImage = true;

Set zoom factor

if (cameraView.MaxZoomFactor >= 2.5f)
 cameraView.ZoomFactor = 2.5f;

Get a snapshot from the playback

ImageSource imageSource = cameraView.GetSnapShot(ImageFormat.PNG);
bool result = cameraView.SaveSnapShot(ImageFormat.PNG, filePath);

Record a video:

var result = await cameraView.StartRecordingAsync(Path.Combine(FileSystem.Current.CacheDirectory, "Video.mp4"), new Size(1920, 1080));
....
result = await cameraView.StopRecordingAsync();

Take a photo

var stream = await cameraView.TakePhotoAsync();
if (stream != null)
{
 var result = ImageSource.FromStream(() => stream);
 snapPreview.Source = result;
}

Use Control with MVVM: The control has several binding properties for take an snapshot:

 /// Binding property for use this control in MVVM.
 public CameraView Self

 /// Sets how often the SnapShot property is updated in seconds.
 /// Default 0: no snapshots are taken
 /// WARNING! A low frequency directly impacts over control performance and memory usage (with AutoSnapShotAsImageSource = true)
 /// </summary>
 public float AutoSnapShotSeconds
 
 /// Sets the snaphost image format
 public ImageFormat AutoSnapShotFormat

 /// Refreshes according to the frequency set in the AutoSnapShotSeconds property (if AutoSnapShotAsImageSource is set to true) or when GetSnapShot is called or TakeAutoSnapShot is set to true
 public ImageSource SnapShot
 
 /// Refreshes according to the frequency set in the AutoSnapShotSeconds property or when GetSnapShot is called.
 /// WARNING. Each time a snapshot is made, the previous stream is disposed.
 public Stream SnapShotStream
 
 /// Change from false to true refresh SnapShot property
 public bool TakeAutoSnapShot
 
 /// If true SnapShot property is refreshed according to the frequency set in the AutoSnapShotSeconds property
 public bool AutoSnapShotAsImageSource
 /// Starts/Stops the Preview if camera property has been set
 public bool AutoStartPreview
 {
 get { return (bool)GetValue(AutoStartPreviewProperty); }
 set { SetValue(AutoStartPreviewProperty, value); }
 }
 /// Full path to file where record video will be recorded.
 public string AutoRecordingFile
 {
 get { return (string)GetValue(AutoRecordingFileProperty); }
 set { SetValue(AutoRecordingFileProperty, value); }
 }
 /// Starts/Stops record video to AutoRecordingFile if camera and microphone properties have been set
 public bool AutoStartRecording
 {
 get { return (bool)GetValue(AutoStartRecordingProperty); }
 set { SetValue(AutoStartRecordingProperty, value); }
 }

<cv:CameraView x:Name="cameraView" WidthRequest="300" HeightRequest="200"
 BarCodeOptions="{Binding BarCodeOptions}" 
 BarCodeResults="{Binding BarCodeResults, Mode=OneWayToSource}"
 Cameras="{Binding Cameras, Mode=OneWayToSource}" Camera="{Binding Camera}" 
 AutoStartPreview="{Binding AutoStartPreview}" 
 NumCamerasDetected="{Binding NumCameras, Mode=OneWayToSource}"
 AutoSnapShotAsImageSource="True" AutoSnapShotFormat="PNG" 
 TakeAutoSnapShot="{Binding TakeSnapshot}" AutoSnapShotSeconds="{Binding SnapshotSeconds}"
 Microphones="{Binding Microphones, Mode=OneWayToSource}" Microphone="{Binding Microphone}"
 NumMicrophonesDetected="{Binding NumMicrophones, Mode=OneWayToSource}"
 AutoRecordingFile="{Binding RecordingFile}" 
 AutoStartRecording="{Binding AutoStartRecording}"/>

You have a complete example of MVVM in MVVM Example

For barcodes detection, you must set the Camera Control BarCodeDecoder property. Enable and Handle barcodes detection with Camera.MAUI.ZXing:

 using Camera.MAUI.ZXing;

 cameraView.BarcodeDetected += CameraView_BarcodeDetected;
 cameraView.BarCodeDecoder = new ZXingBarcodeDecoder();
 cameraView.BarCodeOptions = new BarcodeDecodeOptions
 {
 AutoRotate = true,
 PossibleFormats = { BarcodeFormat.QR_CODE },
 ReadMultipleCodes = false,
 TryHarder = true,
 TryInverted = true
 };
	cameraView.BarCodeDetectionFrameRate = 10;
 cameraView.BarCodeDetectionMaxThreads = 5;
 cameraView.ControlBarcodeResultDuplicate = true;
	cameraView.BarCodeDetectionEnabled = true;

 private void CameraView_BarcodeDetected(object sender, ZXingHelper.BarcodeEventArgs args)
 {
 Debug.WriteLine("BarcodeText=" + args.Result[0].Text);
 }

Use the event or the bindable property BarCodeResults

 /// Event launched every time a code is detected in the image if "BarCodeDetectionEnabled" is set to true.
 public event BarcodeResultHandler BarcodeDetected;
 /// It refresh each time a barcode is detected if BarCodeDetectionEnabled porperty is true
 public Result[] BarCodeResults

BarcodeImage

A ContentView control for generate codebars images.

In XAML, make sure to add the right XML namespace:

xmlns:cv="clr-namespace:Camera.MAUI;assembly=Camera.MAUI"

Use the control and its bindable properties:

<cv:BarcodeImage x:Name="barcodeImage" Aspect="AspectFit"
 WidthRequest="400" HeightRequest="400" 
 BarcodeWidth="200" BarcodeHeight="200" BarcodeMargin="5"
 BarcodeBackground="White" BarcodeForeground="Blue"
 BarcodeFormat="QR_CODE" />

Set the BarcodeEncoder property to enable de image generator (example with Camera.MAUI.ZXing):

barcodeImage.BarcodeEncoder = new ZXingBarcodeEncoder();

Set the barcode property to generate the image:

barcodeImage.Barcode = "https://github.com/hjam40/Camera.MAUI";