RtlGetProductInfo

// ntdll.dll
#include <windows.h>

BOOLEAN RtlGetProductInfo(
    DWORD OSMajorVersion,
    DWORD OSMinorVersion,
    DWORD SpMajorVersion,
    DWORD SpMinorVersion,
    DWORD* ReturnedProductType
);

<DllImport("ntdll.dll", ExactSpelling:=True)>
Public Shared Function RtlGetProductInfo(
    OSMajorVersion As UInteger,   ' DWORD
    OSMinorVersion As UInteger,   ' DWORD
    SpMajorVersion As UInteger,   ' DWORD
    SpMinorVersion As UInteger,   ' DWORD
    <Out> ByRef ReturnedProductType As UInteger   ' DWORD* out
) As Byte
End Function

' OSMajorVersion : DWORD
' OSMinorVersion : DWORD
' SpMajorVersion : DWORD
' SpMinorVersion : DWORD
' ReturnedProductType : DWORD* out
Declare PtrSafe Function RtlGetProductInfo Lib "ntdll" ( _
    ByVal OSMajorVersion As Long, _
    ByVal OSMinorVersion As Long, _
    ByVal SpMajorVersion As Long, _
    ByVal SpMinorVersion As Long, _
    ByRef ReturnedProductType As Long) As Byte
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RtlGetProductInfo = ctypes.windll.ntdll.RtlGetProductInfo
RtlGetProductInfo.restype = ctypes.c_byte
RtlGetProductInfo.argtypes = [
    wintypes.DWORD,  # OSMajorVersion : DWORD
    wintypes.DWORD,  # OSMinorVersion : DWORD
    wintypes.DWORD,  # SpMajorVersion : DWORD
    wintypes.DWORD,  # SpMinorVersion : DWORD
    ctypes.POINTER(wintypes.DWORD),  # ReturnedProductType : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlGetProductInfo = Fiddle::Function.new(
  lib['RtlGetProductInfo'],
  [
    -Fiddle::TYPE_INT,  # OSMajorVersion : DWORD
    -Fiddle::TYPE_INT,  # OSMinorVersion : DWORD
    -Fiddle::TYPE_INT,  # SpMajorVersion : DWORD
    -Fiddle::TYPE_INT,  # SpMinorVersion : DWORD
    Fiddle::TYPE_VOIDP,  # ReturnedProductType : DWORD* out
  ],
  Fiddle::TYPE_CHAR)

#[link(name = "ntdll")]
extern "system" {
    fn RtlGetProductInfo(
        OSMajorVersion: u32,  // DWORD
        OSMinorVersion: u32,  // DWORD
        SpMajorVersion: u32,  // DWORD
        SpMinorVersion: u32,  // DWORD
        ReturnedProductType: *mut u32  // DWORD* out
    ) -> u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ntdll.dll")]
public static extern byte RtlGetProductInfo(uint OSMajorVersion, uint OSMinorVersion, uint SpMajorVersion, uint SpMinorVersion, out uint ReturnedProductType);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ntdll_RtlGetProductInfo' -Namespace Win32 -PassThru
# $api::RtlGetProductInfo(OSMajorVersion, OSMinorVersion, SpMajorVersion, SpMinorVersion, ReturnedProductType)

#uselib "ntdll.dll"
#func global RtlGetProductInfo "RtlGetProductInfo" sptr, sptr, sptr, sptr, sptr
; RtlGetProductInfo OSMajorVersion, OSMinorVersion, SpMajorVersion, SpMinorVersion, varptr(ReturnedProductType)   ; 戻り値は stat
; OSMajorVersion : DWORD -> "sptr"
; OSMinorVersion : DWORD -> "sptr"
; SpMajorVersion : DWORD -> "sptr"
; SpMinorVersion : DWORD -> "sptr"
; ReturnedProductType : DWORD* out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "ntdll.dll"
#cfunc global RtlGetProductInfo "RtlGetProductInfo" int, int, int, int, var
; res = RtlGetProductInfo(OSMajorVersion, OSMinorVersion, SpMajorVersion, SpMinorVersion, ReturnedProductType)
; OSMajorVersion : DWORD -> "int"
; OSMinorVersion : DWORD -> "int"
; SpMajorVersion : DWORD -> "int"
; SpMinorVersion : DWORD -> "int"
; ReturnedProductType : DWORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; BOOLEAN RtlGetProductInfo(DWORD OSMajorVersion, DWORD OSMinorVersion, DWORD SpMajorVersion, DWORD SpMinorVersion, DWORD* ReturnedProductType)
#uselib "ntdll.dll"
#cfunc global RtlGetProductInfo "RtlGetProductInfo" int, int, int, int, var
; res = RtlGetProductInfo(OSMajorVersion, OSMinorVersion, SpMajorVersion, SpMinorVersion, ReturnedProductType)
; OSMajorVersion : DWORD -> "int"
; OSMinorVersion : DWORD -> "int"
; SpMajorVersion : DWORD -> "int"
; SpMinorVersion : DWORD -> "int"
; ReturnedProductType : DWORD* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	ntdll = windows.NewLazySystemDLL("ntdll.dll")
	procRtlGetProductInfo = ntdll.NewProc("RtlGetProductInfo")
)

// OSMajorVersion (DWORD), OSMinorVersion (DWORD), SpMajorVersion (DWORD), SpMinorVersion (DWORD), ReturnedProductType (DWORD* out)
r1, _, err := procRtlGetProductInfo.Call(
	uintptr(OSMajorVersion),
	uintptr(OSMinorVersion),
	uintptr(SpMajorVersion),
	uintptr(SpMinorVersion),
	uintptr(ReturnedProductType),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOLEAN

function RtlGetProductInfo(
  OSMajorVersion: DWORD;   // DWORD
  OSMinorVersion: DWORD;   // DWORD
  SpMajorVersion: DWORD;   // DWORD
  SpMinorVersion: DWORD;   // DWORD
  ReturnedProductType: Pointer   // DWORD* out
): ByteBool; stdcall;
  external 'ntdll.dll' name 'RtlGetProductInfo';

result := DllCall("ntdll\RtlGetProductInfo"
    , "UInt", OSMajorVersion   ; DWORD
    , "UInt", OSMinorVersion   ; DWORD
    , "UInt", SpMajorVersion   ; DWORD
    , "UInt", SpMinorVersion   ; DWORD
    , "Ptr", ReturnedProductType   ; DWORD* out
    , "Char")   ; return: BOOLEAN

●RtlGetProductInfo(OSMajorVersion, OSMinorVersion, SpMajorVersion, SpMinorVersion, ReturnedProductType) = DLL("ntdll.dll", "byte RtlGetProductInfo(dword, dword, dword, dword, void*)")
# 呼び出し: RtlGetProductInfo(OSMajorVersion, OSMinorVersion, SpMajorVersion, SpMinorVersion, ReturnedProductType)
# OSMajorVersion : DWORD -> "dword"
# OSMinorVersion : DWORD -> "dword"
# SpMajorVersion : DWORD -> "dword"
# SpMinorVersion : DWORD -> "dword"
# ReturnedProductType : DWORD* out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。