Reading QR codes from images

This guide demonstrates how to read QR code data from an image.

Use this workflow when you need to:

• Decode URLs, IDs, or text stored in QR codes
• Process one or more QR codes in a single image
• Integrate QR scanning into document or inventory pipelines

Implementation

The workflow loads an image, scans for QR codes, and reads decoded values:

using GdPicture14;

LicenseManager licence = new LicenseManager();
licence.RegisterKEY(""); // Set a demo key

using GdPictureImaging imaging = new GdPictureImaging();
int imageId = imaging.CreateGdPictureImageFromFile(@"input_qr_code.png");
imaging.BarcodeQRReaderDoScan(imageId);
int barcodesCount = imaging.BarcodeQRReaderGetBarcodeCount();
string barcodeValue = imaging.BarcodeQRReaderGetBarcodeValue(1);

Notes

• Use BarcodeQRReaderGetBarcodeCount() to determine how many QR codes were detected.
• Use BarcodeQRReaderGetBarcodeValue(index) to read each result by index.
• Add status checks in production code to handle image load and scan failures.

Conclusion

This workflow detects QR codes in an image and extracts decoded values for downstream processing.