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Scan QR Code with C# REST API

Discover how to scan QR codes with a C# REST API in just a few minutes. This hands‑on tutorial guides you through creating a reliable QR‑code scanner using a C# .NET‑based API combined with the Aspose.BarCode Cloud .NET SDK. You’ll learn to specify the desired barcode or QR formats and achieve lightning‑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

In short, the sample code above shows exactly how to scan QR code from image with C# REST Interface. By setting DecodeBarcodeType to QR, you tell the API to search solely for that barcode format instead of evaluating every possible type. This targeted configuration speeds up scanning, improves reliability, and eliminates the chance of capturing unwanted barcodes.

With this quick walkthrough, you’ve learned how to build a QR‑code scanner using the C# REST API. If you also need to read barcodes, be sure to check out our dedicated guide on Scan Barcode with C# REST API.

 

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