ExampleLibraryConversion.cpp

// ExampleLibraryConversion.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <stdint.h>
#include <stdio.h>

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// RapidJson-specific code

// Configures RapidJson OSS library for our use, most notably
// it defines UNICODE versions of their types so that we can
// serialize UNICODE strings.

#include <stdarg.h>
#include <string>
#include <type_traits>
#include <vector>
#include <cwchar>
#include <guiddef.h>

// Library configuration.  Most of this is straightforward, except for the
// "SizeType" configuration. By default RapidJson uses std::size_t for its
// size type and std::size_t has different sizes depending on the platform.
// For metadata we want a type that is consistent across all platforms.

#define RAPIDJSON_ENDIAN            RAPIDJSON_LITTLEENDIAN 
#define RAPIDJSON_HAS_STDSTRING     1
#define RAPIDJSON_NO_SIZETYPEDEFINE 1

namespace rapidjson { using SizeType = uint32_t; }

// RapidJson triggers this warning
#pragma warning(push)
#pragma warning(disable:4464)   // relative include path contains '..'

#include <rapidjson/document.h>
#include <rapidjson/encodings.h>
#include <rapidjson/writer.h>
#include <rapidjson/stringbuffer.h>
#include <rapidjson/error/en.h>
#include <rapidjson/prettywriter.h>

#pragma warning(pop)

// Convenience alias
namespace json = rapidjson;

// Aliases that provide UNICODE versions of all the RapidJson types we use
using WDocument = json::GenericDocument<json::UTF16<>>;
using WStringBuffer = json::GenericStringBuffer<json::UTF16<>>;
using WStringRef = json::GenericStringRef<json::UTF16<>>;
using WValue = json::GenericValue<json::UTF16<>>;

template <typename OutputStream>
using WPrettyWriter = json::PrettyWriter<OutputStream, json::UTF16<>>;

// ToString uses RapidJson's visitor pattern to generate JSON text
std::wstring ToString(WValue const& value)
{
    WStringBuffer                   stringBuffer;
    WPrettyWriter<WStringBuffer>    writer(stringBuffer);

    value.Accept(writer);
    return stringBuffer.GetString();
}

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// Example structure to serialize;
struct SystemInfo
{
    uint32_t            MajorVersion;
    uint32_t            MinorVersion;
    uint32_t            ProcessId;

    struct
    {
        uint16_t ProcessorArchitecture;
        uint16_t ProcessorLevel;
        uint16_t ProcessorRevision;
        uint8_t  NumberOfProcessors;
        uint8_t  ProductType;
    } System;

    std::wstring UserName;
};

int main()
{
    // Example data
    SystemInfo systemInfo;
    systemInfo.MajorVersion = 10;
    systemInfo.MinorVersion = 0;
    systemInfo.ProcessId = 1234;
    systemInfo.UserName = L"UserName";
    systemInfo.System.NumberOfProcessors = 4;
    systemInfo.System.ProcessorArchitecture = 9;
    systemInfo.System.ProcessorLevel = 10;
    systemInfo.System.ProcessorRevision = 11;
    systemInfo.System.ProductType = 12;
    
    // Construct a 
    WDocument document(json::Type::kObjectType);
    auto allocator = document.GetAllocator();

    // 1. All of the below was generated by copilot

    WValue o(json::Type::kObjectType);
    o.AddMember(L"majorVersion", systemInfo.MajorVersion, allocator);
    o.AddMember(L"minorVersion", systemInfo.MinorVersion, allocator);
    o.AddMember(L"processId", systemInfo.ProcessId, allocator);
    o.AddMember(L"userName", systemInfo.UserName, allocator);

    WValue s(json::Type::kObjectType);
    s.AddMember(L"processorArchitecture", systemInfo.System.ProcessorArchitecture, allocator);
    s.AddMember(L"processorLevel", systemInfo.System.ProcessorLevel, allocator);
    s.AddMember(L"processorRevision", systemInfo.System.ProcessorRevision, allocator);
    s.AddMember(L"numberOfProcessors", systemInfo.System.NumberOfProcessors, allocator);
    s.AddMember(L"productType", systemInfo.System.ProductType, allocator);

    o.AddMember(L"system", s, allocator);

    std::wstring jsonText = ToString(o);

    printf("%ls\n", jsonText.c_str());
}