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Scan QR Code with C# REST API

Discover how to scan QR code with C# REST API in minutes. This tutorial walks you through building a robust QR‑code scanner using a C# .NET‑based API and the Aspose.BarCode Cloud .NET SDK. You’ll learn to define the target barcode or QR formats and achieve fast recognition from any image.

Prerequisite

Steps for QR Photo Scanner with C# REST API

  1. Add references to Aspose.BarCode.Cloud.Sdk.Api and Aspose.BarCode.Cloud.Sdk.Model to access API and model classes
  2. Create a Configuration object and set the API base URL, client ID, and client secret for authentication with Aspose.BarCode Cloud
  3. Specify the image file name and open it as a file stream to prepare it for recognition
  4. Create an instance of RecognizeApi using the configured Configuration object
  5. Call the RecognizeMultipartAsync method with DecodeBarcodeType.QR and the file stream to detect QR codes in the image
  6. Loop through the recognized barcodes in the response and display their values and types

These steps summarize the process to develop a QR code scanner app with C# Low Code API. First, set up the environment by adding Aspose.BarCode.Cloud.Sdk.Api and Aspose.BarCode.Cloud.Sdk.Model, create a Configuration object with your credentials, and load the image file (MultipleQRCodes.png) into a FileStream. Then, use the RecognizeApi class to call RecognizeMultipartAsync, and loop through the results to display each QR code’s BarcodeValue and Type.

Code to Read QR Code with C# REST Interface

The sample code above illustrates exactly how to scan QR code from image with C# REST Interface. By setting DecodeBarcodeType to a specific value—such as QR—you tell the API to look for only that barcode format instead of evaluating every possible type. This focused setting speeds up the scan, boosts reliability, and prevents unwanted barcodes from being captured.

In this concise guide we walked through building a QR‑code reader with the C# REST API. If you also need to scan barcodes, be sure to explore our dedicated tutorial on Scan Barcode with C# REST API.

 

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