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zxing-cpp/zxing-cpp: C++ port of ZXing

ZXing-C++ ("zebra crossing") is an open-source, multi-format linear/matrix barcode image processing library implemented in C++.

It was originally ported from the Java ZXing Library but has been developed further and now includes many improvements in terms of runtime and detection performance. It can both read and write barcodes in a number of formats.

You can sponsor this library at GitHub Sponsors.

Named Sponsors:

• KURZ Digital Solutions GmbH & Co. KG
• Useful Sensors Inc
• synedra

Thanks a lot for your contribution!

• Written in pure C++20 (/C++17), no third-party dependencies (for the library itself)
• Thread safe
• Wrappers/Bindings for:
  • Android
  • C
  • iOS
  • Kotlin/Native
  • .NET
  • Python
  • Rust
  • WebAssembly
  • WinRT
  • Flutter (external project)

[Note:]

• DataBar used to be called RSS.
• DataBar, DX Film Edge, MaxiCode, Micro QR Code and rMQR Code are not supported for writing (unless the library is configured ZXING_WRITERS=NEW and ZXING_EXPERIMENTAL_API=ON).
• Building with only C++17 (see CMakeLists.txt) changes the behavior of the library: it then lacks support for DataBarLimited and multi-symbol and position independent detection for DataMatrix.

1. Load your image into memory (3rd-party library required).
2. Call ReadBarcodes() from ReadBarcode.h, the simplest API to get a list of Barcode objects.

A very simple example looks like this:

#include "ZXing/ReadBarcode.h"
#include <iostream>

int main(int argc, char** argv)
{
    int width, height;
    unsigned char* data;
    // load your image data from somewhere. ImageFormat::Lum assumes grey scale image data.

    auto image = ZXing::ImageView(data, width, height, ZXing::ImageFormat::Lum);
    auto options = ZXing::ReaderOptions().setFormats(ZXing::BarcodeFormat::Any);
    auto barcodes = ZXing::ReadBarcodes(image, options);

    for (const auto& b : barcodes)
        std::cout << ZXing::ToString(b.format()) << ": " << b.text() << "\n";

    return 0;
}

To see the full capability of the API, have a look at ZXingReader.cpp.

[Note: At least C++17 is required on the client side to use the API.]

1. Create a MultiFormatWriter instance with the format you want to generate. Set encoding and margins if needed.
2. Call encode() with text content and the image size. This returns a BitMatrix which is a binary image of the barcode where true == visual black and false == visual white.
3. Convert the bit matrix to your native image format. See also the ToMatrix<T>(BitMatrix&) helper function.

As an example, have a look at ZXingWriter.cpp. That file also contains example code showing the new ZXING_EXPERIMENTAL_API for writing barcodes.

• Read barcodes
• Write barcodes
• Read barcodes from camera

[Note: those live demos are not necessarily fully up-to-date at all times.]

These are the generic instructions to build the library on Windows/macOS/Linux. For details on how to build the individual wrappers, follow the links above.

1. Make sure CMake version 3.16 or newer is installed. The python module requires 3.18 or higher.
2. Make sure a sufficiently C++20 compliant compiler is installed (minimum VS 2019 16.10? / gcc 11 / clang 12?).
3. See the cmake ZXING_... options to enable the testing code, python wrapper, etc.

git clone https://github.com/zxing-cpp/zxing-cpp.git --recursive --single-branch --depth 1
cmake -S zxing-cpp -B zxing-cpp.release -DCMAKE_BUILD_TYPE=Release
cmake --build zxing-cpp.release -j8 --config Release

[Note: binary packages are available for/as vcpkg, conan, mingw and a bunch of linux distributions.]

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