OPTPARAM

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct OPTPARAM
{
    public ushort cbSize;
    public byte Flags;
    public byte Style;
    public IntPtr pData;
    public UIntPtr IconID;
    public IntPtr lParam;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)] public UIntPtr[] dwReserved;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure OPTPARAM
    Public cbSize As UShort
    Public Flags As Byte
    Public Style As Byte
    Public pData As IntPtr
    Public IconID As UIntPtr
    Public lParam As IntPtr
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=2)> Public dwReserved() As UIntPtr
End Structure

import ctypes
from ctypes import wintypes

class OPTPARAM(ctypes.Structure):
    _fields_ = [
        ("cbSize", ctypes.c_ushort),
        ("Flags", ctypes.c_ubyte),
        ("Style", ctypes.c_ubyte),
        ("pData", ctypes.c_void_p),
        ("IconID", ctypes.c_size_t),
        ("lParam", ctypes.c_ssize_t),
        ("dwReserved", ctypes.c_size_t * 2),
    ]

#[repr(C)]
pub struct OPTPARAM {
    pub cbSize: u16,
    pub Flags: u8,
    pub Style: u8,
    pub pData: *mut core::ffi::c_void,
    pub IconID: usize,
    pub lParam: isize,
    pub dwReserved: [usize; 2],
}

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

type OPTPARAM struct {
	cbSize uint16
	Flags byte
	Style byte
	pData uintptr
	IconID uintptr
	lParam uintptr
	dwReserved [2]uintptr
}

type
  OPTPARAM = record
    cbSize: Word;
    Flags: Byte;
    Style: Byte;
    pData: Pointer;
    IconID: NativeUInt;
    lParam: NativeInt;
    dwReserved: array[0..1] of NativeUInt;
  end;

const OPTPARAM = extern struct {
    cbSize: u16,
    Flags: u8,
    Style: u8,
    pData: ?*anyopaque,
    IconID: usize,
    lParam: isize,
    dwReserved: [2]usize,
};

type
  OPTPARAM {.bycopy.} = object
    cbSize: uint16
    Flags: uint8
    Style: uint8
    pData: pointer
    IconID: uint
    lParam: int
    dwReserved: array[2, uint]

struct OPTPARAM
{
    ushort cbSize;
    ubyte Flags;
    ubyte Style;
    void* pData;
    size_t IconID;
    ptrdiff_t lParam;
    size_t[2] dwReserved;
}