NMTTDISPINFOW

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct NMHDR
{
    public IntPtr hwndFrom;
    public UIntPtr idFrom;
    public uint code;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct NMTTDISPINFOW
{
    public NMHDR hdr;
    public IntPtr lpszText;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)] public string szText;
    public IntPtr hinst;
    public uint uFlags;
    public IntPtr lParam;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure NMHDR
    Public hwndFrom As IntPtr
    Public idFrom As UIntPtr
    Public code As UInteger
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure NMTTDISPINFOW
    Public hdr As NMHDR
    Public lpszText As IntPtr
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=80)> Public szText As String
    Public hinst As IntPtr
    Public uFlags As UInteger
    Public lParam As IntPtr
End Structure

import ctypes
from ctypes import wintypes

class NMHDR(ctypes.Structure):
    _fields_ = [
        ("hwndFrom", ctypes.c_void_p),
        ("idFrom", ctypes.c_size_t),
        ("code", wintypes.DWORD),
    ]

class NMTTDISPINFOW(ctypes.Structure):
    _fields_ = [
        ("hdr", NMHDR),
        ("lpszText", ctypes.c_void_p),
        ("szText", ctypes.c_wchar * 80),
        ("hinst", ctypes.c_void_p),
        ("uFlags", wintypes.DWORD),
        ("lParam", ctypes.c_ssize_t),
    ]

#[repr(C)]
pub struct NMHDR {
    pub hwndFrom: *mut core::ffi::c_void,
    pub idFrom: usize,
    pub code: u32,
}

#[repr(C)]
pub struct NMTTDISPINFOW {
    pub hdr: NMHDR,
    pub lpszText: *mut core::ffi::c_void,
    pub szText: [u16; 80],
    pub hinst: *mut core::ffi::c_void,
    pub uFlags: u32,
    pub lParam: isize,
}

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

type NMHDR struct {
	hwndFrom uintptr
	idFrom uintptr
	code uint32
}

type NMTTDISPINFOW struct {
	hdr NMHDR
	lpszText uintptr
	szText [80]uint16
	hinst uintptr
	uFlags uint32
	lParam uintptr
}

type
  NMHDR = record
    hwndFrom: Pointer;
    idFrom: NativeUInt;
    code: DWORD;
  end;

  NMTTDISPINFOW = record
    hdr: NMHDR;
    lpszText: Pointer;
    szText: array[0..79] of WideChar;
    hinst: Pointer;
    uFlags: DWORD;
    lParam: NativeInt;
  end;

const NMHDR = extern struct {
    hwndFrom: ?*anyopaque,
    idFrom: usize,
    code: u32,
};

const NMTTDISPINFOW = extern struct {
    hdr: NMHDR,
    lpszText: ?*anyopaque,
    szText: [80]u16,
    hinst: ?*anyopaque,
    uFlags: u32,
    lParam: isize,
};

type
  NMHDR {.bycopy.} = object
    hwndFrom: pointer
    idFrom: uint
    code: uint32

  NMTTDISPINFOW {.bycopy.} = object
    hdr: NMHDR
    lpszText: pointer
    szText: array[80, uint16]
    hinst: pointer
    uFlags: uint32
    lParam: int

struct NMHDR
{
    void* hwndFrom;
    size_t idFrom;
    uint code;
}

struct NMTTDISPINFOW
{
    NMHDR hdr;
    void* lpszText;
    wchar[80] szText;
    void* hinst;
    uint uFlags;
    ptrdiff_t lParam;
}