EnumDateFormatsExW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

BOOL EnumDateFormatsExW(
    DATEFMT_ENUMPROCEXW lpDateFmtEnumProcEx,
    DWORD Locale,
    DWORD dwFlags
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function EnumDateFormatsExW(
    lpDateFmtEnumProcEx As IntPtr,   ' DATEFMT_ENUMPROCEXW
    Locale As UInteger,   ' DWORD
    dwFlags As UInteger   ' DWORD
) As Boolean
End Function

' lpDateFmtEnumProcEx : DATEFMT_ENUMPROCEXW
' Locale : DWORD
' dwFlags : DWORD
Declare PtrSafe Function EnumDateFormatsExW Lib "kernel32" ( _
    ByVal lpDateFmtEnumProcEx As LongPtr, _
    ByVal Locale As Long, _
    ByVal dwFlags As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

EnumDateFormatsExW = ctypes.windll.kernel32.EnumDateFormatsExW
EnumDateFormatsExW.restype = wintypes.BOOL
EnumDateFormatsExW.argtypes = [
    ctypes.c_void_p,  # lpDateFmtEnumProcEx : DATEFMT_ENUMPROCEXW
    wintypes.DWORD,  # Locale : DWORD
    wintypes.DWORD,  # dwFlags : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
EnumDateFormatsExW = Fiddle::Function.new(
  lib['EnumDateFormatsExW'],
  [
    Fiddle::TYPE_VOIDP,  # lpDateFmtEnumProcEx : DATEFMT_ENUMPROCEXW
    -Fiddle::TYPE_INT,  # Locale : DWORD
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn EnumDateFormatsExW(
        lpDateFmtEnumProcEx: *const core::ffi::c_void,  // DATEFMT_ENUMPROCEXW
        Locale: u32,  // DWORD
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool EnumDateFormatsExW(IntPtr lpDateFmtEnumProcEx, uint Locale, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_EnumDateFormatsExW' -Namespace Win32 -PassThru
# $api::EnumDateFormatsExW(lpDateFmtEnumProcEx, Locale, dwFlags)

#uselib "KERNEL32.dll"
#func global EnumDateFormatsExW "EnumDateFormatsExW" wptr, wptr, wptr
; EnumDateFormatsExW lpDateFmtEnumProcEx, Locale, dwFlags   ; 戻り値は stat
; lpDateFmtEnumProcEx : DATEFMT_ENUMPROCEXW -> "wptr"
; Locale : DWORD -> "wptr"
; dwFlags : DWORD -> "wptr"
; ※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 "KERNEL32.dll"
#cfunc global EnumDateFormatsExW "EnumDateFormatsExW" sptr, int, int
; res = EnumDateFormatsExW(lpDateFmtEnumProcEx, Locale, dwFlags)
; lpDateFmtEnumProcEx : DATEFMT_ENUMPROCEXW -> "sptr"
; Locale : DWORD -> "int"
; dwFlags : DWORD -> "int"

; BOOL EnumDateFormatsExW(DATEFMT_ENUMPROCEXW lpDateFmtEnumProcEx, DWORD Locale, DWORD dwFlags)
#uselib "KERNEL32.dll"
#cfunc global EnumDateFormatsExW "EnumDateFormatsExW" intptr, int, int
; res = EnumDateFormatsExW(lpDateFmtEnumProcEx, Locale, dwFlags)
; lpDateFmtEnumProcEx : DATEFMT_ENUMPROCEXW -> "intptr"
; Locale : DWORD -> "int"
; dwFlags : DWORD -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procEnumDateFormatsExW = kernel32.NewProc("EnumDateFormatsExW")
)

// lpDateFmtEnumProcEx (DATEFMT_ENUMPROCEXW), Locale (DWORD), dwFlags (DWORD)
r1, _, err := procEnumDateFormatsExW.Call(
	uintptr(lpDateFmtEnumProcEx),
	uintptr(Locale),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function EnumDateFormatsExW(
  lpDateFmtEnumProcEx: Pointer;   // DATEFMT_ENUMPROCEXW
  Locale: DWORD;   // DWORD
  dwFlags: DWORD   // DWORD
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'EnumDateFormatsExW';

result := DllCall("KERNEL32\EnumDateFormatsExW"
    , "Ptr", lpDateFmtEnumProcEx   ; DATEFMT_ENUMPROCEXW
    , "UInt", Locale   ; DWORD
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: BOOL

●EnumDateFormatsExW(lpDateFmtEnumProcEx, Locale, dwFlags) = DLL("KERNEL32.dll", "bool EnumDateFormatsExW(void*, dword, dword)")
# 呼び出し: EnumDateFormatsExW(lpDateFmtEnumProcEx, Locale, dwFlags)
# lpDateFmtEnumProcEx : DATEFMT_ENUMPROCEXW -> "void*"
# Locale : DWORD -> "dword"
# dwFlags : DWORD -> "dword"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。