ucol_getRulesEx

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

INT ucol_getRulesEx(
    const UCollator* coll,
    UColRuleOption delta,
    WORD* buffer,
    INT bufferLen
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucol_getRulesEx(
    ByRef coll As IntPtr,   ' UCollator*
    delta As Integer,   ' UColRuleOption
    ByRef buffer As UShort,   ' WORD* in/out
    bufferLen As Integer   ' INT
) As Integer
End Function

' coll : UCollator*
' delta : UColRuleOption
' buffer : WORD* in/out
' bufferLen : INT
Declare PtrSafe Function ucol_getRulesEx Lib "icuin" ( _
    ByRef coll As LongPtr, _
    ByVal delta As Long, _
    ByRef buffer As Integer, _
    ByVal bufferLen 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

ucol_getRulesEx = ctypes.cdll.icuin.ucol_getRulesEx
ucol_getRulesEx.restype = ctypes.c_int
ucol_getRulesEx.argtypes = [
    ctypes.c_void_p,  # coll : UCollator*
    ctypes.c_int,  # delta : UColRuleOption
    ctypes.POINTER(ctypes.c_ushort),  # buffer : WORD* in/out
    ctypes.c_int,  # bufferLen : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
ucol_getRulesEx = Fiddle::Function.new(
  lib['ucol_getRulesEx'],
  [
    Fiddle::TYPE_VOIDP,  # coll : UCollator*
    Fiddle::TYPE_INT,  # delta : UColRuleOption
    Fiddle::TYPE_VOIDP,  # buffer : WORD* in/out
    Fiddle::TYPE_INT,  # bufferLen : INT
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn ucol_getRulesEx(
        coll: *const isize,  // UCollator*
        delta: i32,  // UColRuleOption
        buffer: *mut u16,  // WORD* in/out
        bufferLen: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuin.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int ucol_getRulesEx(ref IntPtr coll, int delta, ref ushort buffer, int bufferLen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_ucol_getRulesEx' -Namespace Win32 -PassThru
# $api::ucol_getRulesEx(coll, delta, buffer, bufferLen)

#uselib "icuin.dll"
#func global ucol_getRulesEx "ucol_getRulesEx" sptr, sptr, sptr, sptr
; ucol_getRulesEx coll, delta, varptr(buffer), bufferLen   ; 戻り値は stat
; coll : UCollator* -> "sptr"
; delta : UColRuleOption -> "sptr"
; buffer : WORD* in/out -> "sptr"
; bufferLen : 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 "icuin.dll"
#cfunc global ucol_getRulesEx "ucol_getRulesEx" int, int, var, int
; res = ucol_getRulesEx(coll, delta, buffer, bufferLen)
; coll : UCollator* -> "int"
; delta : UColRuleOption -> "int"
; buffer : WORD* in/out -> "var"
; bufferLen : 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。

; INT ucol_getRulesEx(UCollator* coll, UColRuleOption delta, WORD* buffer, INT bufferLen)
#uselib "icuin.dll"
#cfunc global ucol_getRulesEx "ucol_getRulesEx" int, int, var, int
; res = ucol_getRulesEx(coll, delta, buffer, bufferLen)
; coll : UCollator* -> "int"
; delta : UColRuleOption -> "int"
; buffer : WORD* in/out -> "var"
; bufferLen : 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 (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procucol_getRulesEx = icuin.NewProc("ucol_getRulesEx")
)

// coll (UCollator*), delta (UColRuleOption), buffer (WORD* in/out), bufferLen (INT)
r1, _, err := procucol_getRulesEx.Call(
	uintptr(coll),
	uintptr(delta),
	uintptr(buffer),
	uintptr(bufferLen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function ucol_getRulesEx(
  coll: Pointer;   // UCollator*
  delta: Integer;   // UColRuleOption
  buffer: Pointer;   // WORD* in/out
  bufferLen: Integer   // INT
): Integer; cdecl;
  external 'icuin.dll' name 'ucol_getRulesEx';

result := DllCall("icuin\ucol_getRulesEx"
    , "Ptr", coll   ; UCollator*
    , "Int", delta   ; UColRuleOption
    , "Ptr", buffer   ; WORD* in/out
    , "Int", bufferLen   ; INT
    , "Cdecl Int")   ; return: INT

●ucol_getRulesEx(coll, delta, buffer, bufferLen) = DLL("icuin.dll", "int ucol_getRulesEx(void*, int, void*, int)")
# 呼び出し: ucol_getRulesEx(coll, delta, buffer, bufferLen)
# coll : UCollator* -> "void*"
# delta : UColRuleOption -> "int"
# buffer : WORD* in/out -> "void*"
# bufferLen : 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。