Functionnal json 2 bin example

.gitignore

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+build
+json2bin_converter

.vscode/settings.json

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+{
+    "files.associations": {
+        "complex": "cpp",
+        "string": "cpp",
+        "iterator": "cpp",
+        "string_view": "cpp",
+        "random": "cpp",
+        "fstream": "cpp",
+        "iomanip": "cpp",
+        "iosfwd": "cpp",
+        "istream": "cpp",
+        "ostream": "cpp",
+        "sstream": "cpp",
+        "streambuf": "cpp",
+        "system_error": "cpp"
+    }
+}

.vscode/tasks.json

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+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Build",
+            "detail": "Build project",
+            "type": "shell",
+            "command": "make",
+            "group": "build",
+            "presentation": {
+                "echo": true,
+                "reveal": "always",
+                "focus": true,
+                "panel": "shared",
+                "showReuseMessage": true,
+                "clear": true
+            }
+        },
+        {
+            "label": "Clean",
+            "detail": "Clean build directory",
+            "type": "shell",
+            "command": "make",
+            "args": [
+                "clean"
+            ],
+            "group": "build",
+            "presentation": {
+                "echo": true,
+                "reveal": "never",
+                "focus": false,
+                "panel": "shared",
+                "showReuseMessage": true,
+                "clear": false
+            }
+        }
+    ]
+}

Makefile

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+# Compiler flags
+CFLAGS = -std=c++17
+
+# Defaul target
+all: build_dir json2bin_converter
+
+# Create build directory
+build_dir:
+	mkdir -p build
+
+# Link target
+json2bin_converter: build/main.o build/bin.o
+	g++ -o json2bin_converter build/main.o build/bin.o
+
+# Compile objects
+build/main.o: src/main.cpp src/bin.hpp src/json/json.hpp
+	g++ $(CFLAGS) -c src/main.cpp -o build/main.o
+
+build/bin.o: src/bin.cpp src/bin.hpp src/json/json.hpp
+	g++ $(CFLAGS) -c src/bin.cpp -o build/bin.o
+
+# Clean
+.PHONY: clean
+clean:
+	rm -rf build/* json2bin_converter

src/bin.cpp

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+#include "bin.hpp"
+
+void load_json_into_bin(json *json_input, Bin *bin_output)
+{
+    bin_output->value1 = (*json_input)["value1"].get<uint8_t>();
+    bin_output->value2 = (*json_input)["value2"].get<uint8_t>();
+}

src/bin.hpp

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+#ifndef BIN_H
+#define BIN_H
+
+#include "json/json.hpp"
+
+using nlohmann::json;
+
+struct Bin {
+    uint8_t value1;
+    uint8_t value2;
+};
+
+void load_json_into_bin(json *json_input, Bin *bin_output);
+
+#endif // BIN_H

src/main.cpp

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+#include <fstream>
+#include <iostream>
+
+#include "bin.hpp"
+
+void error(std::string error);
+
+int main(int argc, char *argv[])
+{
+    if(argc != 3)
+    {
+        error("You need to give an input and output file");
+        return EXIT_FAILURE;
+    }
+
+    std::ifstream json_input_file {argv[1]};
+    if(!json_input_file)
+    {
+        error("Couldn't open input file");
+        return EXIT_FAILURE;
+    }
+
+    std::ofstream bin_output_file {argv[2], std::ios::binary};
+    if(!bin_output_file)
+    {
+        error("Couldn't create output file");
+        return EXIT_FAILURE;
+    }
+
+    json json_input = json::parse(json_input_file);
+    Bin bin_output;
+
+    load_json_into_bin(&json_input, &bin_output);
+
+    bin_output_file.write(reinterpret_cast<char*>(&bin_output), sizeof(Bin));
+
+    return EXIT_SUCCESS;
+}
+
+void error(std::string error)
+{
+    std::cerr << "\033[0;1;31mError\033[m : " << error << "\n";
+}

test.bin

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+
+*

test.json

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+{
+    "value1": 10,
+    "value2": 42
+}