Python: Create and Scan QR Codes

QR codes are a type of two-dimensional barcode that can store a variety of information, including URLs, contact details, and even payment information. QR codes have become increasingly popular, allowing for quick and convenient access to digital content, making them a useful tool in our modern, technology-driven world.

In this article, you will learn how to create and scan QR codes in Python using Spire.Barcode for Python.

• Create a QR Code in Python
• Scan a QR Code Image in Python

Get a Free Trial License

The trial version of Spire.Barcode for Python does not support scanning QR code images without a valid license being applied. Additionally, it displays an evaluation message on any QR code images that are generated.

To remove these limitations, you can get a 30-day trial license for free.

Create a QR Code in Python

Spire.Barcode for Python offers the BarcodeSettings class, which enables you to configure the settings for generating a barcode. These settings encompass the barcode type, the data to be encoded, the color, the margins, and the horizontal and vertical resolution.

After you have set up the desired settings, you can create a BarcodeGenerator instance using those configurations. Subsequently, you can invoke the GenerateImage() method of the generator to produce the barcode image.

The following are the steps to create a QR code in Python.

• Create a BarcodeSettings object.
• Set the barcode type to QR code using BarcodeSettings.Type property.
• Set the data of the 2D barcode using BarcodeSettings.Data2D property.
• Set other attributes of the barcode using the properties under the BarcodeSettings object.
• Create a BarCodeGenerator object based on the settings.
• Create a QR code image using BarCodeGenerator.GenerateImage() method.

from spire.barcode import *

# Write all bytes to a file
def WriteAllBytes(fname: str, data):
    with open(fname, "wb") as fp:
        fp.write(data)
    fp.close()

# Apply license key
License.SetLicenseKey("license key")

# Create a BarcodeSettings object
barcodeSettings = BarcodeSettings()

# Set the type of barcode to QR code
barcodeSettings.Type = BarCodeType.QRCode

# Set the data for the 2D barcode
barcodeSettings.Data2D = "Hello, World"

# Set margins
barcodeSettings.LeftMargin = 0.2
barcodeSettings.RightMargin = 0.2
barcodeSettings.TopMargin = 0.2
barcodeSettings.BottomMargin = 0.2

# Set the horizontal resolution
barcodeSettings.DpiX = 500

# Set the vertical resolution
barcodeSettings.DpiY = 500

# Set error correction level
barcodeSettings.QRCodeECL = QRCodeECL.M

# Do not display text on barcode
barcodeSettings.ShowText = False
  
# Add a logo at the center of the QR code
barcodeSettings.SetQRCodeLogoImage("C:\\Users\\Administrator\\Desktop\\logo.png")

# Create an instance of BarCodeGenerator with the specified settings
barCodeGenerator = BarCodeGenerator(barcodeSettings)

# Generate the image for the barcode
image = barCodeGenerator.GenerateImage()

# Write the PNG image to disk
WriteAllBytes("output/QRCode.png", image)

Scan a QR Code Image in Python

Spire.Barcode provides the BarcodeScanner class, which is responsible for barcode image recognition. This class offers several methods to extract data from barcodes, including:

• ScanOneFile(): Scans a single barcode image file and returns the extracted data.
• ScanFile(): Scans all barcodes present in a specified image file and returns the extracted data.
• ScanStream(): Scans barcodes from a stream of image data and returns the extracted information.

The following code demonstrates how to scan a QR code image using it.

from spire.barcode import *

# Apply license key
License.SetLicenseKey("license key")

# Scan an image file that contains one barcode
result = BarcodeScanner.ScanOneFile("C:\\Users\\Administrator\\Desktop\\QRCode.png")

# Scan an image file that contains multiple barcodes
# results = BarcodeScanner.ScanFile("C:\\Users\\Administrator\\Desktop\\Image.png")

# Print the result
print(result)

• Create QR Code in Java