Retrieving the Decoded Data (Advanced)¶

This code snippet shows how to read a QR code and retrieve its coding mode, the raw bit stream and the data part by part.

C++¶

#include <eVision/EasyQRCode/EQRCodeReader.h>

using namespace eVision;

// Image constructor
EImageBW8 srcImage;

// QR code reader constructor
EQRCodeReader reader;
// ...

// Read
std::vector<EQRCode> qrCodes = reader.Read(srcImage);

// Retrieve the data stream of the first QR code found
EQRCodeDecodedStream stream = qrCodes[0].GetDecodedStream();

// Retrieve the coding mode and the raw bit stream of the first QR code found
EQRCodeCodingMode codingMode = stream.GetCodingMode();
std::vector<uint8_t> bitstream = stream.GetRawBitstream();

// Retrieve the encoding and the decoded data of each part of the first QR code found
std::vector<EQRCodeDecodedStreamPart> parts = stream.GetDecodedStreamParts();
for (unsigned int i = 0; i < parts.size(); ++i)
{
  // Retrieve encoding
  EQRCodeEncoding encoding = parts[i].GetEncoding();

  // Retrieve the decoded data
  std::vector<uint8_t> decodedData = parts[i].GetDecodedData();

  // Interpret the decoded data based on the retrieved encoding
}

C#¶

using eVision;

// Image constructor
EImageBW8 srcImage = new EImageBW8();

// QR code reader constructor
EQRCodeReader reader = new EQRCodeReader();

// ...

// Read
EQRCode[] qrCodes = reader.Read(srcImage);

// Retrieve the data stream of the first QR code found
EQRCodeDecodedStream stream = qrCodes[0].DecodedStream;

// Retrieve the coding mode and the raw bit stream of the first QR code found
EQRCodeCodingMode codingMode = stream.CodingMode;
byte[] bitstream = stream.RawBitstream;

// Retrieve the encoding and the decoded data of each part of the first QR code found
EQRCodeDecodedStreamPart[] parts = stream.DecodedStreamParts;
for (uint i = 0; i < parts.Length; ++i)
{
  // Retrieve encoding
  EQRCodeEncoding encoding = parts[i].Encoding;

  // Retrieve the decoded data
  byte[] decodedData = parts[i].DecodedData;

  // Interpret the decoded data based on the retrieved encoding
}

Python¶

import eVision
# Image constructor
src_image = eVision.EImageBW8()

# QR code reader constructor
reader = eVision.EQRCodeReader()
# ...

# Read
qr_codes = reader.Read(src_image)

# Retrieve the data stream of the first QR code found
stream = qr_codes[0].DecodedStream

# Retrieve the coding mode and the raw bit stream of the first QR code found
coding_mode = stream.CodingMode
bitstream = stream.RawBitstream

# Retrieve the encoding and the decoded data of each part of the first QR code found
parts = stream.DecodedStreamParts
for part in parts:
    # Retrieve encoding
    encoding = part.Encoding

    # Retrieve the decoded data
    decoded_data = part.DecodedData

    # Interpret the decoded data based on the retrieved encoding