udat_countSymbols

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

INT udat_countSymbols(
    const void** fmt,
    UDateFormatSymbolType type
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function udat_countSymbols(
    fmt As IntPtr,   ' void**
    type As Integer   ' UDateFormatSymbolType
) As Integer
End Function

' fmt : void**
' type : UDateFormatSymbolType
Declare PtrSafe Function udat_countSymbols Lib "icuin" ( _
    ByVal fmt As LongPtr, _
    ByVal type 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_countSymbols = ctypes.cdll.icuin.udat_countSymbols
udat_countSymbols.restype = ctypes.c_int
udat_countSymbols.argtypes = [
    ctypes.c_void_p,  # fmt : void**
    ctypes.c_int,  # type : UDateFormatSymbolType
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
udat_countSymbols = Fiddle::Function.new(
  lib['udat_countSymbols'],
  [
    Fiddle::TYPE_VOIDP,  # fmt : void**
    Fiddle::TYPE_INT,  # type : UDateFormatSymbolType
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn udat_countSymbols(
        fmt: *const *const (),  // void**
        type: i32  // UDateFormatSymbolType
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "icuin.dll"
#func global udat_countSymbols "udat_countSymbols" sptr, sptr
; udat_countSymbols fmt, type   ; 戻り値は stat
; fmt : void** -> "sptr"
; type : UDateFormatSymbolType -> "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_countSymbols "udat_countSymbols" sptr, int
; res = udat_countSymbols(fmt, type)
; fmt : void** -> "sptr"
; type : UDateFormatSymbolType -> "int"

; INT udat_countSymbols(void** fmt, UDateFormatSymbolType type)
#uselib "icuin.dll"
#cfunc global udat_countSymbols "udat_countSymbols" intptr, int
; res = udat_countSymbols(fmt, type)
; fmt : void** -> "intptr"
; type : UDateFormatSymbolType -> "int"

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

var (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procudat_countSymbols = icuin.NewProc("udat_countSymbols")
)

// fmt (void**), type (UDateFormatSymbolType)
r1, _, err := procudat_countSymbols.Call(
	uintptr(fmt),
	uintptr(type),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function udat_countSymbols(
  fmt: Pointer;   // void**
  type: Integer   // UDateFormatSymbolType
): Integer; cdecl;
  external 'icuin.dll' name 'udat_countSymbols';

result := DllCall("icuin\udat_countSymbols"
    , "Ptr", fmt   ; void**
    , "Int", type   ; UDateFormatSymbolType
    , "Cdecl Int")   ; return: INT

●udat_countSymbols(fmt, type) = DLL("icuin.dll", "int udat_countSymbols(void*, int)")
# 呼び出し: udat_countSymbols(fmt, type)
# fmt : void** -> "void*"
# type : UDateFormatSymbolType -> "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。