udat_formatForFields

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

INT udat_formatForFields(
    const void** format,
    DOUBLE dateToFormat,
    WORD* result,
    INT resultLength,
    UFieldPositionIterator* fpositer,
    UErrorCode* status
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function udat_formatForFields(
    format As IntPtr,   ' void**
    dateToFormat As Double,   ' DOUBLE
    ByRef result As UShort,   ' WORD* in/out
    resultLength As Integer,   ' INT
    ByRef fpositer As IntPtr,   ' UFieldPositionIterator* in/out
    ByRef status As Integer   ' UErrorCode* in/out
) As Integer
End Function

' format : void**
' dateToFormat : DOUBLE
' result : WORD* in/out
' resultLength : INT
' fpositer : UFieldPositionIterator* in/out
' status : UErrorCode* in/out
Declare PtrSafe Function udat_formatForFields Lib "icuin" ( _
    ByVal format As LongPtr, _
    ByVal dateToFormat As Double, _
    ByRef result As Integer, _
    ByVal resultLength As Long, _
    ByRef fpositer As LongPtr, _
    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_formatForFields = ctypes.cdll.icuin.udat_formatForFields
udat_formatForFields.restype = ctypes.c_int
udat_formatForFields.argtypes = [
    ctypes.c_void_p,  # format : void**
    ctypes.c_double,  # dateToFormat : DOUBLE
    ctypes.POINTER(ctypes.c_ushort),  # result : WORD* in/out
    ctypes.c_int,  # resultLength : INT
    ctypes.c_void_p,  # fpositer : UFieldPositionIterator* in/out
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
udat_formatForFields = Fiddle::Function.new(
  lib['udat_formatForFields'],
  [
    Fiddle::TYPE_VOIDP,  # format : void**
    Fiddle::TYPE_DOUBLE,  # dateToFormat : DOUBLE
    Fiddle::TYPE_VOIDP,  # result : WORD* in/out
    Fiddle::TYPE_INT,  # resultLength : INT
    Fiddle::TYPE_VOIDP,  # fpositer : UFieldPositionIterator* in/out
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn udat_formatForFields(
        format: *const *const (),  // void**
        dateToFormat: f64,  // DOUBLE
        result: *mut u16,  // WORD* in/out
        resultLength: i32,  // INT
        fpositer: *mut isize,  // UFieldPositionIterator* in/out
        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_formatForFields(IntPtr format, double dateToFormat, ref ushort result, int resultLength, ref IntPtr fpositer, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_udat_formatForFields' -Namespace Win32 -PassThru
# $api::udat_formatForFields(format, dateToFormat, result, resultLength, fpositer, status)

#uselib "icuin.dll"
#func global udat_formatForFields "udat_formatForFields" sptr, double, sptr, sptr, sptr, sptr
; udat_formatForFields format, dateToFormat, varptr(result), resultLength, fpositer, status   ; 戻り値は stat
; format : void** -> "sptr"
; dateToFormat : DOUBLE -> "double"
; result : WORD* in/out -> "sptr"
; resultLength : INT -> "sptr"
; fpositer : UFieldPositionIterator* in/out -> "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_formatForFields "udat_formatForFields" sptr, double, var, int, int, int
; res = udat_formatForFields(format, dateToFormat, result, resultLength, fpositer, status)
; format : void** -> "sptr"
; dateToFormat : DOUBLE -> "double"
; result : WORD* in/out -> "var"
; resultLength : INT -> "int"
; fpositer : UFieldPositionIterator* in/out -> "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_formatForFields(void** format, DOUBLE dateToFormat, WORD* result, INT resultLength, UFieldPositionIterator* fpositer, UErrorCode* status)
#uselib "icuin.dll"
#cfunc global udat_formatForFields "udat_formatForFields" intptr, double, var, int, int, int
; res = udat_formatForFields(format, dateToFormat, result, resultLength, fpositer, status)
; format : void** -> "intptr"
; dateToFormat : DOUBLE -> "double"
; result : WORD* in/out -> "var"
; resultLength : INT -> "int"
; fpositer : UFieldPositionIterator* in/out -> "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 (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procudat_formatForFields = icuin.NewProc("udat_formatForFields")
)

// format (void**), dateToFormat (DOUBLE), result (WORD* in/out), resultLength (INT), fpositer (UFieldPositionIterator* in/out), status (UErrorCode* in/out)
r1, _, err := procudat_formatForFields.Call(
	uintptr(format),
	uintptr(math.Float64bits(dateToFormat)),
	uintptr(result),
	uintptr(resultLength),
	uintptr(fpositer),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT
// 注意: float/double 引数は proc.Call では XMM レジスタに渡せません。
// windows.SyscallN(proc.Addr(), math.Float64bits(x), ...) もしくは cgo を使用してください。

function udat_formatForFields(
  format: Pointer;   // void**
  dateToFormat: Double;   // DOUBLE
  result: Pointer;   // WORD* in/out
  resultLength: Integer;   // INT
  fpositer: Pointer;   // UFieldPositionIterator* in/out
  status: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuin.dll' name 'udat_formatForFields';

result := DllCall("icuin\udat_formatForFields"
    , "Ptr", format   ; void**
    , "Double", dateToFormat   ; DOUBLE
    , "Ptr", result   ; WORD* in/out
    , "Int", resultLength   ; INT
    , "Ptr", fpositer   ; UFieldPositionIterator* in/out
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●udat_formatForFields(format, dateToFormat, result, resultLength, fpositer, status) = DLL("icuin.dll", "int udat_formatForFields(void*, double, void*, int, void*, void*)")
# 呼び出し: udat_formatForFields(format, dateToFormat, result, resultLength, fpositer, status)
# format : void** -> "void*"
# dateToFormat : DOUBLE -> "double"
# result : WORD* in/out -> "void*"
# resultLength : INT -> "int"
# fpositer : UFieldPositionIterator* in/out -> "void*"
# 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。