CreateCaret

// USER32.dll
#include <windows.h>

BOOL CreateCaret(
    HWND hWnd,
    HBITMAP hBitmap,   // optional
    INT nWidth,
    INT nHeight
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CreateCaret(
    hWnd As IntPtr,   ' HWND
    hBitmap As IntPtr,   ' HBITMAP optional
    nWidth As Integer,   ' INT
    nHeight As Integer   ' INT
) As Boolean
End Function

' hWnd : HWND
' hBitmap : HBITMAP optional
' nWidth : INT
' nHeight : INT
Declare PtrSafe Function CreateCaret Lib "user32" ( _
    ByVal hWnd As LongPtr, _
    ByVal hBitmap As LongPtr, _
    ByVal nWidth As Long, _
    ByVal nHeight As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CreateCaret = ctypes.windll.user32.CreateCaret
CreateCaret.restype = wintypes.BOOL
CreateCaret.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    wintypes.HANDLE,  # hBitmap : HBITMAP optional
    ctypes.c_int,  # nWidth : INT
    ctypes.c_int,  # nHeight : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CreateCaret = Fiddle::Function.new(
  lib['CreateCaret'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    Fiddle::TYPE_VOIDP,  # hBitmap : HBITMAP optional
    Fiddle::TYPE_INT,  # nWidth : INT
    Fiddle::TYPE_INT,  # nHeight : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn CreateCaret(
        hWnd: *mut core::ffi::c_void,  // HWND
        hBitmap: *mut core::ffi::c_void,  // HBITMAP optional
        nWidth: i32,  // INT
        nHeight: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true)]
public static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap, int nWidth, int nHeight);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CreateCaret' -Namespace Win32 -PassThru
# $api::CreateCaret(hWnd, hBitmap, nWidth, nHeight)

#uselib "USER32.dll"
#func global CreateCaret "CreateCaret" sptr, sptr, sptr, sptr
; CreateCaret hWnd, hBitmap, nWidth, nHeight   ; 戻り値は stat
; hWnd : HWND -> "sptr"
; hBitmap : HBITMAP optional -> "sptr"
; nWidth : INT -> "sptr"
; nHeight : INT -> "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 "USER32.dll"
#cfunc global CreateCaret "CreateCaret" sptr, sptr, int, int
; res = CreateCaret(hWnd, hBitmap, nWidth, nHeight)
; hWnd : HWND -> "sptr"
; hBitmap : HBITMAP optional -> "sptr"
; nWidth : INT -> "int"
; nHeight : INT -> "int"

; BOOL CreateCaret(HWND hWnd, HBITMAP hBitmap, INT nWidth, INT nHeight)
#uselib "USER32.dll"
#cfunc global CreateCaret "CreateCaret" intptr, intptr, int, int
; res = CreateCaret(hWnd, hBitmap, nWidth, nHeight)
; hWnd : HWND -> "intptr"
; hBitmap : HBITMAP optional -> "intptr"
; nWidth : INT -> "int"
; nHeight : INT -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCreateCaret = user32.NewProc("CreateCaret")
)

// hWnd (HWND), hBitmap (HBITMAP optional), nWidth (INT), nHeight (INT)
r1, _, err := procCreateCaret.Call(
	uintptr(hWnd),
	uintptr(hBitmap),
	uintptr(nWidth),
	uintptr(nHeight),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CreateCaret(
  hWnd: THandle;   // HWND
  hBitmap: THandle;   // HBITMAP optional
  nWidth: Integer;   // INT
  nHeight: Integer   // INT
): BOOL; stdcall;
  external 'USER32.dll' name 'CreateCaret';

result := DllCall("USER32\CreateCaret"
    , "Ptr", hWnd   ; HWND
    , "Ptr", hBitmap   ; HBITMAP optional
    , "Int", nWidth   ; INT
    , "Int", nHeight   ; INT
    , "Int")   ; return: BOOL

●CreateCaret(hWnd, hBitmap, nWidth, nHeight) = DLL("USER32.dll", "bool CreateCaret(void*, void*, int, int)")
# 呼び出し: CreateCaret(hWnd, hBitmap, nWidth, nHeight)
# hWnd : HWND -> "void*"
# hBitmap : HBITMAP optional -> "void*"
# nWidth : INT -> "int"
# nHeight : INT -> "int"
# 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)。