ucnvsel_selectForString

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

UEnumeration* ucnvsel_selectForString(
    const UConverterSelector* sel,
    const WORD* s,
    INT length,
    UErrorCode* status
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucnvsel_selectForString(
    ByRef sel As IntPtr,   ' UConverterSelector*
    ByRef s As UShort,   ' WORD*
    length As Integer,   ' INT
    ByRef status As Integer   ' UErrorCode* in/out
) As IntPtr
End Function

' sel : UConverterSelector*
' s : WORD*
' length : INT
' status : UErrorCode* in/out
Declare PtrSafe Function ucnvsel_selectForString Lib "icuuc" ( _
    ByRef sel As LongPtr, _
    ByRef s As Integer, _
    ByVal length As Long, _
    ByRef status As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ucnvsel_selectForString = ctypes.cdll.icuuc.ucnvsel_selectForString
ucnvsel_selectForString.restype = ctypes.c_void_p
ucnvsel_selectForString.argtypes = [
    ctypes.c_void_p,  # sel : UConverterSelector*
    ctypes.POINTER(ctypes.c_ushort),  # s : WORD*
    ctypes.c_int,  # length : INT
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnvsel_selectForString = Fiddle::Function.new(
  lib['ucnvsel_selectForString'],
  [
    Fiddle::TYPE_VOIDP,  # sel : UConverterSelector*
    Fiddle::TYPE_VOIDP,  # s : WORD*
    Fiddle::TYPE_INT,  # length : INT
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnvsel_selectForString(
        sel: *const isize,  // UConverterSelector*
        s: *const u16,  // WORD*
        length: i32,  // INT
        status: *mut i32  // UErrorCode* in/out
    ) -> *mut isize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr ucnvsel_selectForString(ref IntPtr sel, ref ushort s, int length, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnvsel_selectForString' -Namespace Win32 -PassThru
# $api::ucnvsel_selectForString(sel, s, length, status)

#uselib "icuuc.dll"
#func global ucnvsel_selectForString "ucnvsel_selectForString" sptr, sptr, sptr, sptr
; ucnvsel_selectForString sel, varptr(s), length, status   ; 戻り値は stat
; sel : UConverterSelector* -> "sptr"
; s : WORD* -> "sptr"
; length : INT -> "sptr"
; status : UErrorCode* in/out -> "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 "icuuc.dll"
#cfunc global ucnvsel_selectForString "ucnvsel_selectForString" int, var, int, int
; res = ucnvsel_selectForString(sel, s, length, status)
; sel : UConverterSelector* -> "int"
; s : WORD* -> "var"
; length : INT -> "int"
; status : UErrorCode* in/out -> "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。

; UEnumeration* ucnvsel_selectForString(UConverterSelector* sel, WORD* s, INT length, UErrorCode* status)
#uselib "icuuc.dll"
#cfunc global ucnvsel_selectForString "ucnvsel_selectForString" int, var, int, int
; res = ucnvsel_selectForString(sel, s, length, status)
; sel : UConverterSelector* -> "int"
; s : WORD* -> "var"
; length : INT -> "int"
; status : UErrorCode* in/out -> "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 (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnvsel_selectForString = icuuc.NewProc("ucnvsel_selectForString")
)

// sel (UConverterSelector*), s (WORD*), length (INT), status (UErrorCode* in/out)
r1, _, err := procucnvsel_selectForString.Call(
	uintptr(sel),
	uintptr(s),
	uintptr(length),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // UEnumeration*

function ucnvsel_selectForString(
  sel: Pointer;   // UConverterSelector*
  s: Pointer;   // WORD*
  length: Integer;   // INT
  status: Pointer   // UErrorCode* in/out
): Pointer; cdecl;
  external 'icuuc.dll' name 'ucnvsel_selectForString';

result := DllCall("icuuc\ucnvsel_selectForString"
    , "Ptr", sel   ; UConverterSelector*
    , "Ptr", s   ; WORD*
    , "Int", length   ; INT
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Ptr")   ; return: UEnumeration*

●ucnvsel_selectForString(sel, s, length, status) = DLL("icuuc.dll", "void* ucnvsel_selectForString(void*, void*, int, void*)")
# 呼び出し: ucnvsel_selectForString(sel, s, length, status)
# sel : UConverterSelector* -> "void*"
# s : WORD* -> "void*"
# length : INT -> "int"
# status : UErrorCode* in/out -> "void*"
# 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。