Windows の OS のバージョン取得するヤツ

RtlGetVersion.cpp

#include <iostream>
#include <Windows.h>

void OutputWindowsInformation()
{
	const auto hModule = ::LoadLibrary(TEXT("ntdll.dll"));
	if (!hModule) return;

	if (const auto address = ::GetProcAddress(hModule, "RtlGetVersion"))
	{
		using RtlGetVersionType = NTSTATUS(WINAPI *)(OSVERSIONINFOEXW*);
		const auto RtlGetVersion = reinterpret_cast<RtlGetVersionType>(address);

		OSVERSIONINFOEXW os = { sizeof(os) };
		if (!FAILED(RtlGetVersion(&os)))
		{
			std::wcout << "OS VERSION    : " << os.dwMajorVersion << "." << os.dwMinorVersion << std::endl;
			std::wcout << "BUILD NUMBER  : " << os.dwBuildNumber << std::endl;
			std::wcout << "SERVICE PACK  : " << os.szCSDVersion << std::endl;
		}
	}

	::FreeLibrary(hModule);
}

int main()
{
    OutputWindowsInformation();
    return 0;
}