EnumCalendarInfoExEx

// KERNEL32.dll
#include <windows.h>

BOOL EnumCalendarInfoExEx(
    CALINFO_ENUMPROCEXEX pCalInfoEnumProcExEx,
    LPCWSTR lpLocaleName,   // optional
    DWORD Calendar,
    LPCWSTR lpReserved,   // optional
    DWORD CalType,
    LPARAM lParam
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function EnumCalendarInfoExEx(
    pCalInfoEnumProcExEx As IntPtr,   ' CALINFO_ENUMPROCEXEX
    <MarshalAs(UnmanagedType.LPWStr)> lpLocaleName As String,   ' LPCWSTR optional
    Calendar As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpReserved As String,   ' LPCWSTR optional
    CalType As UInteger,   ' DWORD
    lParam As IntPtr   ' LPARAM
) As Boolean
End Function

' pCalInfoEnumProcExEx : CALINFO_ENUMPROCEXEX
' lpLocaleName : LPCWSTR optional
' Calendar : DWORD
' lpReserved : LPCWSTR optional
' CalType : DWORD
' lParam : LPARAM
Declare PtrSafe Function EnumCalendarInfoExEx Lib "kernel32" ( _
    ByVal pCalInfoEnumProcExEx As LongPtr, _
    ByVal lpLocaleName As LongPtr, _
    ByVal Calendar As Long, _
    ByVal lpReserved As LongPtr, _
    ByVal CalType As Long, _
    ByVal lParam As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

EnumCalendarInfoExEx = ctypes.windll.kernel32.EnumCalendarInfoExEx
EnumCalendarInfoExEx.restype = wintypes.BOOL
EnumCalendarInfoExEx.argtypes = [
    ctypes.c_void_p,  # pCalInfoEnumProcExEx : CALINFO_ENUMPROCEXEX
    wintypes.LPCWSTR,  # lpLocaleName : LPCWSTR optional
    wintypes.DWORD,  # Calendar : DWORD
    wintypes.LPCWSTR,  # lpReserved : LPCWSTR optional
    wintypes.DWORD,  # CalType : DWORD
    ctypes.c_ssize_t,  # lParam : LPARAM
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
EnumCalendarInfoExEx = Fiddle::Function.new(
  lib['EnumCalendarInfoExEx'],
  [
    Fiddle::TYPE_VOIDP,  # pCalInfoEnumProcExEx : CALINFO_ENUMPROCEXEX
    Fiddle::TYPE_VOIDP,  # lpLocaleName : LPCWSTR optional
    -Fiddle::TYPE_INT,  # Calendar : DWORD
    Fiddle::TYPE_VOIDP,  # lpReserved : LPCWSTR optional
    -Fiddle::TYPE_INT,  # CalType : DWORD
    Fiddle::TYPE_INTPTR_T,  # lParam : LPARAM
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn EnumCalendarInfoExEx(
        pCalInfoEnumProcExEx: *const core::ffi::c_void,  // CALINFO_ENUMPROCEXEX
        lpLocaleName: *const u16,  // LPCWSTR optional
        Calendar: u32,  // DWORD
        lpReserved: *const u16,  // LPCWSTR optional
        CalType: u32,  // DWORD
        lParam: isize  // LPARAM
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool EnumCalendarInfoExEx(IntPtr pCalInfoEnumProcExEx, [MarshalAs(UnmanagedType.LPWStr)] string lpLocaleName, uint Calendar, [MarshalAs(UnmanagedType.LPWStr)] string lpReserved, uint CalType, IntPtr lParam);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_EnumCalendarInfoExEx' -Namespace Win32 -PassThru
# $api::EnumCalendarInfoExEx(pCalInfoEnumProcExEx, lpLocaleName, Calendar, lpReserved, CalType, lParam)

#uselib "KERNEL32.dll"
#func global EnumCalendarInfoExEx "EnumCalendarInfoExEx" sptr, sptr, sptr, sptr, sptr, sptr
; EnumCalendarInfoExEx pCalInfoEnumProcExEx, lpLocaleName, Calendar, lpReserved, CalType, lParam   ; 戻り値は stat
; pCalInfoEnumProcExEx : CALINFO_ENUMPROCEXEX -> "sptr"
; lpLocaleName : LPCWSTR optional -> "sptr"
; Calendar : DWORD -> "sptr"
; lpReserved : LPCWSTR optional -> "sptr"
; CalType : DWORD -> "sptr"
; lParam : LPARAM -> "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 "KERNEL32.dll"
#cfunc global EnumCalendarInfoExEx "EnumCalendarInfoExEx" sptr, wstr, int, wstr, int, sptr
; res = EnumCalendarInfoExEx(pCalInfoEnumProcExEx, lpLocaleName, Calendar, lpReserved, CalType, lParam)
; pCalInfoEnumProcExEx : CALINFO_ENUMPROCEXEX -> "sptr"
; lpLocaleName : LPCWSTR optional -> "wstr"
; Calendar : DWORD -> "int"
; lpReserved : LPCWSTR optional -> "wstr"
; CalType : DWORD -> "int"
; lParam : LPARAM -> "sptr"

; BOOL EnumCalendarInfoExEx(CALINFO_ENUMPROCEXEX pCalInfoEnumProcExEx, LPCWSTR lpLocaleName, DWORD Calendar, LPCWSTR lpReserved, DWORD CalType, LPARAM lParam)
#uselib "KERNEL32.dll"
#cfunc global EnumCalendarInfoExEx "EnumCalendarInfoExEx" intptr, wstr, int, wstr, int, intptr
; res = EnumCalendarInfoExEx(pCalInfoEnumProcExEx, lpLocaleName, Calendar, lpReserved, CalType, lParam)
; pCalInfoEnumProcExEx : CALINFO_ENUMPROCEXEX -> "intptr"
; lpLocaleName : LPCWSTR optional -> "wstr"
; Calendar : DWORD -> "int"
; lpReserved : LPCWSTR optional -> "wstr"
; CalType : DWORD -> "int"
; lParam : LPARAM -> "intptr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procEnumCalendarInfoExEx = kernel32.NewProc("EnumCalendarInfoExEx")
)

// pCalInfoEnumProcExEx (CALINFO_ENUMPROCEXEX), lpLocaleName (LPCWSTR optional), Calendar (DWORD), lpReserved (LPCWSTR optional), CalType (DWORD), lParam (LPARAM)
r1, _, err := procEnumCalendarInfoExEx.Call(
	uintptr(pCalInfoEnumProcExEx),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpLocaleName))),
	uintptr(Calendar),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpReserved))),
	uintptr(CalType),
	uintptr(lParam),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function EnumCalendarInfoExEx(
  pCalInfoEnumProcExEx: Pointer;   // CALINFO_ENUMPROCEXEX
  lpLocaleName: PWideChar;   // LPCWSTR optional
  Calendar: DWORD;   // DWORD
  lpReserved: PWideChar;   // LPCWSTR optional
  CalType: DWORD;   // DWORD
  lParam: NativeInt   // LPARAM
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'EnumCalendarInfoExEx';

result := DllCall("KERNEL32\EnumCalendarInfoExEx"
    , "Ptr", pCalInfoEnumProcExEx   ; CALINFO_ENUMPROCEXEX
    , "WStr", lpLocaleName   ; LPCWSTR optional
    , "UInt", Calendar   ; DWORD
    , "WStr", lpReserved   ; LPCWSTR optional
    , "UInt", CalType   ; DWORD
    , "Ptr", lParam   ; LPARAM
    , "Int")   ; return: BOOL

●EnumCalendarInfoExEx(pCalInfoEnumProcExEx, lpLocaleName, Calendar, lpReserved, CalType, lParam) = DLL("KERNEL32.dll", "bool EnumCalendarInfoExEx(void*, char*, dword, char*, dword, int)")
# 呼び出し: EnumCalendarInfoExEx(pCalInfoEnumProcExEx, lpLocaleName, Calendar, lpReserved, CalType, lParam)
# pCalInfoEnumProcExEx : CALINFO_ENUMPROCEXEX -> "void*"
# lpLocaleName : LPCWSTR optional -> "char*"
# Calendar : DWORD -> "dword"
# lpReserved : LPCWSTR optional -> "char*"
# CalType : DWORD -> "dword"
# lParam : LPARAM -> "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)。