Scanning Live Video Streams with IronQR

1. Access the device's camera feed

Open the camera through a platform-native API: Xamarin.Essentials, MAUI Camera, or the Android/iOS SDKs directly.

2. Grab frames continuously

Pull a frame on a short interval, for example every 100ms, and convert it into a bitmap.

3. Pass each frame to the reader

Wrap the captured bitmap in a QrImageInput and hand it to QrReader.Read().

// Load the asset into QrImageInput
QrImageInput imageInput = new QrImageInput(capturedBitmap);
// Create a QR Reader object
QrReader reader = new QrReader();
// Read the Input an get all embedded QR Codes
IEnumerable<QrResult> results = reader.Read(imageInput);

// Load the asset into QrImageInput
QrImageInput imageInput = new QrImageInput(capturedBitmap);
// Create a QR Reader object
QrReader reader = new QrReader();
// Read the Input an get all embedded QR Codes
IEnumerable<QrResult> results = reader.Read(imageInput);

' Load the asset into QrImageInput
Dim imageInput As New QrImageInput(capturedBitmap)
' 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)

Each call analyzes one still frame. Decode them back to back and the camera appears to scan live, even though IronQR only ever sees individual images.