GetCalendarInfoW

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

INT GetCalendarInfoW(
    DWORD Locale,
    DWORD Calendar,
    DWORD CalType,
    LPWSTR lpCalData,   // optional
    INT cchData,
    DWORD* lpValue   // optional
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetCalendarInfoW(
    Locale As UInteger,   ' DWORD
    Calendar As UInteger,   ' DWORD
    CalType As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpCalData As System.Text.StringBuilder,   ' LPWSTR optional, out
    cchData As Integer,   ' INT
    lpValue As IntPtr   ' DWORD* optional, out
) As Integer
End Function

' Locale : DWORD
' Calendar : DWORD
' CalType : DWORD
' lpCalData : LPWSTR optional, out
' cchData : INT
' lpValue : DWORD* optional, out
Declare PtrSafe Function GetCalendarInfoW Lib "kernel32" ( _
    ByVal Locale As Long, _
    ByVal Calendar As Long, _
    ByVal CalType As Long, _
    ByVal lpCalData As LongPtr, _
    ByVal cchData As Long, _
    ByVal lpValue As LongPtr) 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

GetCalendarInfoW = ctypes.windll.kernel32.GetCalendarInfoW
GetCalendarInfoW.restype = ctypes.c_int
GetCalendarInfoW.argtypes = [
    wintypes.DWORD,  # Locale : DWORD
    wintypes.DWORD,  # Calendar : DWORD
    wintypes.DWORD,  # CalType : DWORD
    wintypes.LPWSTR,  # lpCalData : LPWSTR optional, out
    ctypes.c_int,  # cchData : INT
    ctypes.POINTER(wintypes.DWORD),  # lpValue : DWORD* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetCalendarInfoW = Fiddle::Function.new(
  lib['GetCalendarInfoW'],
  [
    -Fiddle::TYPE_INT,  # Locale : DWORD
    -Fiddle::TYPE_INT,  # Calendar : DWORD
    -Fiddle::TYPE_INT,  # CalType : DWORD
    Fiddle::TYPE_VOIDP,  # lpCalData : LPWSTR optional, out
    Fiddle::TYPE_INT,  # cchData : INT
    Fiddle::TYPE_VOIDP,  # lpValue : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn GetCalendarInfoW(
        Locale: u32,  // DWORD
        Calendar: u32,  // DWORD
        CalType: u32,  // DWORD
        lpCalData: *mut u16,  // LPWSTR optional, out
        cchData: i32,  // INT
        lpValue: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern int GetCalendarInfoW(uint Locale, uint Calendar, uint CalType, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpCalData, int cchData, IntPtr lpValue);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetCalendarInfoW' -Namespace Win32 -PassThru
# $api::GetCalendarInfoW(Locale, Calendar, CalType, lpCalData, cchData, lpValue)

#uselib "KERNEL32.dll"
#func global GetCalendarInfoW "GetCalendarInfoW" wptr, wptr, wptr, wptr, wptr, wptr
; GetCalendarInfoW Locale, Calendar, CalType, varptr(lpCalData), cchData, varptr(lpValue)   ; 戻り値は stat
; Locale : DWORD -> "wptr"
; Calendar : DWORD -> "wptr"
; CalType : DWORD -> "wptr"
; lpCalData : LPWSTR optional, out -> "wptr"
; cchData : INT -> "wptr"
; lpValue : DWORD* optional, out -> "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 GetCalendarInfoW "GetCalendarInfoW" int, int, int, var, int, var
; res = GetCalendarInfoW(Locale, Calendar, CalType, lpCalData, cchData, lpValue)
; Locale : DWORD -> "int"
; Calendar : DWORD -> "int"
; CalType : DWORD -> "int"
; lpCalData : LPWSTR optional, out -> "var"
; cchData : INT -> "int"
; lpValue : DWORD* optional, out -> "var"
; ※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 GetCalendarInfoW(DWORD Locale, DWORD Calendar, DWORD CalType, LPWSTR lpCalData, INT cchData, DWORD* lpValue)
#uselib "KERNEL32.dll"
#cfunc global GetCalendarInfoW "GetCalendarInfoW" int, int, int, var, int, var
; res = GetCalendarInfoW(Locale, Calendar, CalType, lpCalData, cchData, lpValue)
; Locale : DWORD -> "int"
; Calendar : DWORD -> "int"
; CalType : DWORD -> "int"
; lpCalData : LPWSTR optional, out -> "var"
; cchData : INT -> "int"
; lpValue : DWORD* optional, out -> "var"
; ※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 (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetCalendarInfoW = kernel32.NewProc("GetCalendarInfoW")
)

// Locale (DWORD), Calendar (DWORD), CalType (DWORD), lpCalData (LPWSTR optional, out), cchData (INT), lpValue (DWORD* optional, out)
r1, _, err := procGetCalendarInfoW.Call(
	uintptr(Locale),
	uintptr(Calendar),
	uintptr(CalType),
	uintptr(lpCalData),
	uintptr(cchData),
	uintptr(lpValue),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetCalendarInfoW(
  Locale: DWORD;   // DWORD
  Calendar: DWORD;   // DWORD
  CalType: DWORD;   // DWORD
  lpCalData: PWideChar;   // LPWSTR optional, out
  cchData: Integer;   // INT
  lpValue: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'KERNEL32.dll' name 'GetCalendarInfoW';

result := DllCall("KERNEL32\GetCalendarInfoW"
    , "UInt", Locale   ; DWORD
    , "UInt", Calendar   ; DWORD
    , "UInt", CalType   ; DWORD
    , "Ptr", lpCalData   ; LPWSTR optional, out
    , "Int", cchData   ; INT
    , "Ptr", lpValue   ; DWORD* optional, out
    , "Int")   ; return: INT

●GetCalendarInfoW(Locale, Calendar, CalType, lpCalData, cchData, lpValue) = DLL("KERNEL32.dll", "int GetCalendarInfoW(dword, dword, dword, char*, int, void*)")
# 呼び出し: GetCalendarInfoW(Locale, Calendar, CalType, lpCalData, cchData, lpValue)
# Locale : DWORD -> "dword"
# Calendar : DWORD -> "dword"
# CalType : DWORD -> "dword"
# lpCalData : LPWSTR optional, out -> "char*"
# cchData : INT -> "int"
# lpValue : DWORD* optional, 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。