IMESTRUCT

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct IMESTRUCT
{
    public uint fnc;
    public UIntPtr wParam;
    public uint wCount;
    public uint dchSource;
    public uint dchDest;
    public IntPtr lParam1;
    public IntPtr lParam2;
    public IntPtr lParam3;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure IMESTRUCT
    Public fnc As UInteger
    Public wParam As UIntPtr
    Public wCount As UInteger
    Public dchSource As UInteger
    Public dchDest As UInteger
    Public lParam1 As IntPtr
    Public lParam2 As IntPtr
    Public lParam3 As IntPtr
End Structure

import ctypes
from ctypes import wintypes

class IMESTRUCT(ctypes.Structure):
    _fields_ = [
        ("fnc", wintypes.DWORD),
        ("wParam", ctypes.c_size_t),
        ("wCount", wintypes.DWORD),
        ("dchSource", wintypes.DWORD),
        ("dchDest", wintypes.DWORD),
        ("lParam1", ctypes.c_ssize_t),
        ("lParam2", ctypes.c_ssize_t),
        ("lParam3", ctypes.c_ssize_t),
    ]

#[repr(C)]
pub struct IMESTRUCT {
    pub fnc: u32,
    pub wParam: usize,
    pub wCount: u32,
    pub dchSource: u32,
    pub dchDest: u32,
    pub lParam1: isize,
    pub lParam2: isize,
    pub lParam3: isize,
}

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

type IMESTRUCT struct {
	fnc uint32
	wParam uintptr
	wCount uint32
	dchSource uint32
	dchDest uint32
	lParam1 uintptr
	lParam2 uintptr
	lParam3 uintptr
}

type
  IMESTRUCT = record
    fnc: DWORD;
    wParam: NativeUInt;
    wCount: DWORD;
    dchSource: DWORD;
    dchDest: DWORD;
    lParam1: NativeInt;
    lParam2: NativeInt;
    lParam3: NativeInt;
  end;

const IMESTRUCT = extern struct {
    fnc: u32,
    wParam: usize,
    wCount: u32,
    dchSource: u32,
    dchDest: u32,
    lParam1: isize,
    lParam2: isize,
    lParam3: isize,
};

type
  IMESTRUCT {.bycopy.} = object
    fnc: uint32
    wParam: uint
    wCount: uint32
    dchSource: uint32
    dchDest: uint32
    lParam1: int
    lParam2: int
    lParam3: int

struct IMESTRUCT
{
    uint fnc;
    size_t wParam;
    uint wCount;
    uint dchSource;
    uint dchDest;
    ptrdiff_t lParam1;
    ptrdiff_t lParam2;
    ptrdiff_t lParam3;
}