udat_getNumberFormatForField

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

void** udat_getNumberFormatForField(
    const void** fmt,
    WORD field
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function udat_getNumberFormatForField(
    fmt As IntPtr,   ' void**
    field As UShort   ' WORD
) As IntPtr
End Function

' fmt : void**
' field : WORD
Declare PtrSafe Function udat_getNumberFormatForField Lib "icuin" ( _
    ByVal fmt As LongPtr, _
    ByVal field As Integer) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

udat_getNumberFormatForField = ctypes.cdll.icuin.udat_getNumberFormatForField
udat_getNumberFormatForField.restype = ctypes.c_void_p
udat_getNumberFormatForField.argtypes = [
    ctypes.c_void_p,  # fmt : void**
    ctypes.c_ushort,  # field : WORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
udat_getNumberFormatForField = Fiddle::Function.new(
  lib['udat_getNumberFormatForField'],
  [
    Fiddle::TYPE_VOIDP,  # fmt : void**
    -Fiddle::TYPE_SHORT,  # field : WORD
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn udat_getNumberFormatForField(
        fmt: *const *const (),  // void**
        field: u16  // WORD
    ) -> *mut *mut ();
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuin.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr udat_getNumberFormatForField(IntPtr fmt, ushort field);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_udat_getNumberFormatForField' -Namespace Win32 -PassThru
# $api::udat_getNumberFormatForField(fmt, field)

#uselib "icuin.dll"
#func global udat_getNumberFormatForField "udat_getNumberFormatForField" sptr, sptr
; udat_getNumberFormatForField fmt, field   ; 戻り値は stat
; fmt : void** -> "sptr"
; field : WORD -> "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_getNumberFormatForField "udat_getNumberFormatForField" sptr, int
; res = udat_getNumberFormatForField(fmt, field)
; fmt : void** -> "sptr"
; field : WORD -> "int"

; void** udat_getNumberFormatForField(void** fmt, WORD field)
#uselib "icuin.dll"
#cfunc global udat_getNumberFormatForField "udat_getNumberFormatForField" intptr, int
; res = udat_getNumberFormatForField(fmt, field)
; fmt : void** -> "intptr"
; field : WORD -> "int"

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

var (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procudat_getNumberFormatForField = icuin.NewProc("udat_getNumberFormatForField")
)

// fmt (void**), field (WORD)
r1, _, err := procudat_getNumberFormatForField.Call(
	uintptr(fmt),
	uintptr(field),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void**

function udat_getNumberFormatForField(
  fmt: Pointer;   // void**
  field: Word   // WORD
): Pointer; cdecl;
  external 'icuin.dll' name 'udat_getNumberFormatForField';

result := DllCall("icuin\udat_getNumberFormatForField"
    , "Ptr", fmt   ; void**
    , "UShort", field   ; WORD
    , "Cdecl Ptr")   ; return: void**

●udat_getNumberFormatForField(fmt, field) = DLL("icuin.dll", "void* udat_getNumberFormatForField(void*, int)")
# 呼び出し: udat_getNumberFormatForField(fmt, field)
# fmt : void** -> "void*"
# field : WORD -> "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。