raspberry_pi_oled

C/C++ Barcode Reader for Raspberry Pi 4

The sample demonstrates how to build a C/C++ barcode reader app on Raspberry Pi 4.

Prerequisites

• Raspberry Pi 4 (4GB model)
• Raspberry Pi RGB Cooling HAT with adjustable fan and OLED display
• Micro-HDMI to HDMI cable
• HDMI Female to HDMI Female Coupler Connector
• USB Webcam

Install OpenCV

1. Download OpenCV source code: https://github.com/opencv/opencv/releases

2. Install required packages:

   sudo apt install build-essential cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libjpeg-dev libpng-dev libtiff-dev

3. Build and install OpenCV:

   mkdir build
   cd build
   cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local -DOPENCV_GENERATE_PKGCONFIG=ON ..
   make -j4
   sudo make install
   

Build and Run

1. Get a 30-day trial license of Dynamsoft Barcode Reader and update the following code in main.cxx:

   iRet = reader.InitLicense("LICENSE-KEY");

2. Build and run the barcode reader app on Raspberry Pi 4:

   mkdir build
   cd build
   cmake ..
   cmake --build .
   ./main
   

   

App Auto Start

1. Create /home/pi/autostart.sh:

   #!/bin/sh
   /home/pi/raspberry-pi-cpp-barcode/build/main
   

2. Change the file permission:

   chmod a+x autostart.sh
   

3. Create /home/pi/.config/autostart/autostart.desktop:

   [Desktop Entry]
   Type=Application
   Exec=sh /home/pi/autostart.sh
   

4. Reboot:

   sudo reboot
   

Blog

How to Build C/C++ Barcode Reader App on Raspberry Pi 4