SYSTEM_INFO

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct SYSTEM_INFO
{
    public _Anonymous_e__Union Anonymous;
    public uint dwPageSize;
    public IntPtr lpMinimumApplicationAddress;
    public IntPtr lpMaximumApplicationAddress;
    public UIntPtr dwActiveProcessorMask;
    public uint dwNumberOfProcessors;
    public uint dwProcessorType;
    public uint dwAllocationGranularity;
    public ushort wProcessorLevel;
    public ushort wProcessorRevision;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure SYSTEM_INFO
    Public Anonymous As _Anonymous_e__Union
    Public dwPageSize As UInteger
    Public lpMinimumApplicationAddress As IntPtr
    Public lpMaximumApplicationAddress As IntPtr
    Public dwActiveProcessorMask As UIntPtr
    Public dwNumberOfProcessors As UInteger
    Public dwProcessorType As UInteger
    Public dwAllocationGranularity As UInteger
    Public wProcessorLevel As UShort
    Public wProcessorRevision As UShort
End Structure

import ctypes
from ctypes import wintypes

class SYSTEM_INFO(ctypes.Structure):
    _fields_ = [
        ("Anonymous", _Anonymous_e__Union),
        ("dwPageSize", wintypes.DWORD),
        ("lpMinimumApplicationAddress", ctypes.c_void_p),
        ("lpMaximumApplicationAddress", ctypes.c_void_p),
        ("dwActiveProcessorMask", ctypes.c_size_t),
        ("dwNumberOfProcessors", wintypes.DWORD),
        ("dwProcessorType", wintypes.DWORD),
        ("dwAllocationGranularity", wintypes.DWORD),
        ("wProcessorLevel", ctypes.c_ushort),
        ("wProcessorRevision", ctypes.c_ushort),
    ]

#[repr(C)]
pub struct SYSTEM_INFO {
    pub Anonymous: _Anonymous_e__Union,
    pub dwPageSize: u32,
    pub lpMinimumApplicationAddress: *mut core::ffi::c_void,
    pub lpMaximumApplicationAddress: *mut core::ffi::c_void,
    pub dwActiveProcessorMask: usize,
    pub dwNumberOfProcessors: u32,
    pub dwProcessorType: u32,
    pub dwAllocationGranularity: u32,
    pub wProcessorLevel: u16,
    pub wProcessorRevision: u16,
}

import "golang.org/x/sys/windows"

type SYSTEM_INFO struct {
	Anonymous _Anonymous_e__Union
	dwPageSize uint32
	lpMinimumApplicationAddress uintptr
	lpMaximumApplicationAddress uintptr
	dwActiveProcessorMask uintptr
	dwNumberOfProcessors uint32
	dwProcessorType uint32
	dwAllocationGranularity uint32
	wProcessorLevel uint16
	wProcessorRevision uint16
}

type
  SYSTEM_INFO = record
    Anonymous: _Anonymous_e__Union;
    dwPageSize: DWORD;
    lpMinimumApplicationAddress: Pointer;
    lpMaximumApplicationAddress: Pointer;
    dwActiveProcessorMask: NativeUInt;
    dwNumberOfProcessors: DWORD;
    dwProcessorType: DWORD;
    dwAllocationGranularity: DWORD;
    wProcessorLevel: Word;
    wProcessorRevision: Word;
  end;

const SYSTEM_INFO = extern struct {
    Anonymous: _Anonymous_e__Union,
    dwPageSize: u32,
    lpMinimumApplicationAddress: ?*anyopaque,
    lpMaximumApplicationAddress: ?*anyopaque,
    dwActiveProcessorMask: usize,
    dwNumberOfProcessors: u32,
    dwProcessorType: u32,
    dwAllocationGranularity: u32,
    wProcessorLevel: u16,
    wProcessorRevision: u16,
};

type
  SYSTEM_INFO {.bycopy.} = object
    Anonymous: _Anonymous_e__Union
    dwPageSize: uint32
    lpMinimumApplicationAddress: pointer
    lpMaximumApplicationAddress: pointer
    dwActiveProcessorMask: uint
    dwNumberOfProcessors: uint32
    dwProcessorType: uint32
    dwAllocationGranularity: uint32
    wProcessorLevel: uint16
    wProcessorRevision: uint16

struct SYSTEM_INFO
{
    _Anonymous_e__Union Anonymous;
    uint dwPageSize;
    void* lpMinimumApplicationAddress;
    void* lpMaximumApplicationAddress;
    size_t dwActiveProcessorMask;
    uint dwNumberOfProcessors;
    uint dwProcessorType;
    uint dwAllocationGranularity;
    ushort wProcessorLevel;
    ushort wProcessorRevision;
}