ESC/POS C++ Engine This is a high-performance C++20 engine for ESC/POS thermal printing. It is designed as a standalone C++ library for any C++ project, while also providing an optional Android JNI bridge for mobile integration.
Usage
- Pure C++ Projects The core logic in escpos_engine.cpp is platform-agnostic and has no external dependencies.
Include escpos_engine.h in your project.
Call the engine using std::span or std::vector for image data.
C++ #include "escpos_engine.h"
// Example call auto printData = EscPosCore::prepareRasterData(pixelSpan, width, height); 2. Android Integration Copy the source files to src/main/cpp/.
Link the provided CMakeLists.txt in your build.gradle.
Use the Kotlin interface. Note: The Kotlin file must reside in the com.example.printer package to match the JNI signatures.
Kotlin // In your Android Activity/Service val pixels = IntArray(width * height) bitmap.getPixels(pixels, 0, width, 0, 0, width, height)
val printData = PrinterBridge.buildPrintJob(pixels, width, height) Technical Specifications Language Standard: C++20 (requires std::span).
Format: Supports GS v 0 (Raster bit image) commands.
Binarization: Built-in luminance-based conversion (Threshold: 128).
Architecture escpos_engine.cpp: Core printing logic (Universal).
jni_bridge.cpp: JNI translation layer (Optional for Android).
PrinterBridge.kt: Kotlin API (Optional for Android).