udat_getSymbols

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

INT udat_getSymbols(
    const void** fmt,
    UDateFormatSymbolType type,
    INT symbolIndex,
    WORD* result,
    INT resultLength,
    UErrorCode* status
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function udat_getSymbols(
    fmt As IntPtr,   ' void**
    type As Integer,   ' UDateFormatSymbolType
    symbolIndex As Integer,   ' INT
    ByRef result As UShort,   ' WORD* in/out
    resultLength As Integer,   ' INT
    ByRef status As Integer   ' UErrorCode* in/out
) As Integer
End Function

' fmt : void**
' type : UDateFormatSymbolType
' symbolIndex : INT
' result : WORD* in/out
' resultLength : INT
' status : UErrorCode* in/out
Declare PtrSafe Function udat_getSymbols Lib "icuin" ( _
    ByVal fmt As LongPtr, _
    ByVal type As Long, _
    ByVal symbolIndex As Long, _
    ByRef result As Integer, _
    ByVal resultLength As Long, _
    ByRef status 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

udat_getSymbols = ctypes.cdll.icuin.udat_getSymbols
udat_getSymbols.restype = ctypes.c_int
udat_getSymbols.argtypes = [
    ctypes.c_void_p,  # fmt : void**
    ctypes.c_int,  # type : UDateFormatSymbolType
    ctypes.c_int,  # symbolIndex : INT
    ctypes.POINTER(ctypes.c_ushort),  # result : WORD* in/out
    ctypes.c_int,  # resultLength : INT
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
udat_getSymbols = Fiddle::Function.new(
  lib['udat_getSymbols'],
  [
    Fiddle::TYPE_VOIDP,  # fmt : void**
    Fiddle::TYPE_INT,  # type : UDateFormatSymbolType
    Fiddle::TYPE_INT,  # symbolIndex : INT
    Fiddle::TYPE_VOIDP,  # result : WORD* in/out
    Fiddle::TYPE_INT,  # resultLength : INT
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn udat_getSymbols(
        fmt: *const *const (),  // void**
        type: i32,  // UDateFormatSymbolType
        symbolIndex: i32,  // INT
        result: *mut u16,  // WORD* in/out
        resultLength: i32,  // INT
        status: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuin.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int udat_getSymbols(IntPtr fmt, int type, int symbolIndex, ref ushort result, int resultLength, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_udat_getSymbols' -Namespace Win32 -PassThru
# $api::udat_getSymbols(fmt, type, symbolIndex, result, resultLength, status)

#uselib "icuin.dll"
#func global udat_getSymbols "udat_getSymbols" sptr, sptr, sptr, sptr, sptr, sptr
; udat_getSymbols fmt, type, symbolIndex, varptr(result), resultLength, status   ; 戻り値は stat
; fmt : void** -> "sptr"
; type : UDateFormatSymbolType -> "sptr"
; symbolIndex : INT -> "sptr"
; result : WORD* in/out -> "sptr"
; resultLength : 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 "icuin.dll"
#cfunc global udat_getSymbols "udat_getSymbols" sptr, int, int, var, int, int
; res = udat_getSymbols(fmt, type, symbolIndex, result, resultLength, status)
; fmt : void** -> "sptr"
; type : UDateFormatSymbolType -> "int"
; symbolIndex : INT -> "int"
; result : WORD* in/out -> "var"
; resultLength : 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。

; INT udat_getSymbols(void** fmt, UDateFormatSymbolType type, INT symbolIndex, WORD* result, INT resultLength, UErrorCode* status)
#uselib "icuin.dll"
#cfunc global udat_getSymbols "udat_getSymbols" intptr, int, int, var, int, int
; res = udat_getSymbols(fmt, type, symbolIndex, result, resultLength, status)
; fmt : void** -> "intptr"
; type : UDateFormatSymbolType -> "int"
; symbolIndex : INT -> "int"
; result : WORD* in/out -> "var"
; resultLength : 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 (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procudat_getSymbols = icuin.NewProc("udat_getSymbols")
)

// fmt (void**), type (UDateFormatSymbolType), symbolIndex (INT), result (WORD* in/out), resultLength (INT), status (UErrorCode* in/out)
r1, _, err := procudat_getSymbols.Call(
	uintptr(fmt),
	uintptr(type),
	uintptr(symbolIndex),
	uintptr(result),
	uintptr(resultLength),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function udat_getSymbols(
  fmt: Pointer;   // void**
  type: Integer;   // UDateFormatSymbolType
  symbolIndex: Integer;   // INT
  result: Pointer;   // WORD* in/out
  resultLength: Integer;   // INT
  status: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuin.dll' name 'udat_getSymbols';

result := DllCall("icuin\udat_getSymbols"
    , "Ptr", fmt   ; void**
    , "Int", type   ; UDateFormatSymbolType
    , "Int", symbolIndex   ; INT
    , "Ptr", result   ; WORD* in/out
    , "Int", resultLength   ; INT
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●udat_getSymbols(fmt, type, symbolIndex, result, resultLength, status) = DLL("icuin.dll", "int udat_getSymbols(void*, int, int, void*, int, void*)")
# 呼び出し: udat_getSymbols(fmt, type, symbolIndex, result, resultLength, status)
# fmt : void** -> "void*"
# type : UDateFormatSymbolType -> "int"
# symbolIndex : INT -> "int"
# result : WORD* in/out -> "void*"
# resultLength : 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。