uset_retainAllCodePoints

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

void uset_retainAllCodePoints(
    USet* set,
    const WORD* str,
    INT length
);

<DllImport("icu.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub uset_retainAllCodePoints(
    ByRef [set] As IntPtr,   ' USet* in/out
    ByRef str As UShort,   ' WORD*
    length As Integer   ' INT
)
End Sub

' set : USet* in/out
' str : WORD*
' length : INT
Declare PtrSafe Sub uset_retainAllCodePoints Lib "icu" ( _
    ByRef set As LongPtr, _
    ByRef str As Integer, _
    ByVal length As Long)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

uset_retainAllCodePoints = ctypes.cdll.icu.uset_retainAllCodePoints
uset_retainAllCodePoints.restype = None
uset_retainAllCodePoints.argtypes = [
    ctypes.c_void_p,  # set : USet* in/out
    ctypes.POINTER(ctypes.c_ushort),  # str : WORD*
    ctypes.c_int,  # length : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icu.dll')
uset_retainAllCodePoints = Fiddle::Function.new(
  lib['uset_retainAllCodePoints'],
  [
    Fiddle::TYPE_VOIDP,  # set : USet* in/out
    Fiddle::TYPE_VOIDP,  # str : WORD*
    Fiddle::TYPE_INT,  # length : INT
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

#[link(name = "icu")]
extern "C" {
    fn uset_retainAllCodePoints(
        set: *mut isize,  // USet* in/out
        str: *const u16,  // WORD*
        length: i32  // INT
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icu.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void uset_retainAllCodePoints(ref IntPtr set, ref ushort str, int length);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icu_uset_retainAllCodePoints' -Namespace Win32 -PassThru
# $api::uset_retainAllCodePoints(set, str, length)

#uselib "icu.dll"
#func global uset_retainAllCodePoints "uset_retainAllCodePoints" sptr, sptr, sptr
; uset_retainAllCodePoints set, varptr(str), length
; set : USet* in/out -> "sptr"
; str : WORD* -> "sptr"
; length : INT -> "sptr"

#uselib "icu.dll"
#func global uset_retainAllCodePoints "uset_retainAllCodePoints" int, var, int
; uset_retainAllCodePoints set, str, length
; set : USet* in/out -> "int"
; str : WORD* -> "var"
; length : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; void uset_retainAllCodePoints(USet* set, WORD* str, INT length)
#uselib "icu.dll"
#func global uset_retainAllCodePoints "uset_retainAllCodePoints" int, var, int
; uset_retainAllCodePoints set, str, length
; set : USet* in/out -> "int"
; str : WORD* -> "var"
; length : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	icu = windows.NewLazySystemDLL("icu.dll")
	procuset_retainAllCodePoints = icu.NewProc("uset_retainAllCodePoints")
)

// set (USet* in/out), str (WORD*), length (INT)
r1, _, err := procuset_retainAllCodePoints.Call(
	uintptr(set),
	uintptr(str),
	uintptr(length),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure uset_retainAllCodePoints(
  set: Pointer;   // USet* in/out
  str: Pointer;   // WORD*
  length: Integer   // INT
); cdecl;
  external 'icu.dll' name 'uset_retainAllCodePoints';

result := DllCall("icu\uset_retainAllCodePoints"
    , "Ptr", set   ; USet* in/out
    , "Ptr", str   ; WORD*
    , "Int", length   ; INT
    , "Cdecl Int")   ; return: void

●uset_retainAllCodePoints(set, str, length) = DLL("icu.dll", "int uset_retainAllCodePoints(void*, void*, int)")
# 呼び出し: uset_retainAllCodePoints(set, str, length)
# set : USet* in/out -> "void*"
# str : WORD* -> "void*"
# length : 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。