GetCalendarDateFormatEx

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

BOOL GetCalendarDateFormatEx(
    LPCWSTR lpszLocale,
    DWORD dwFlags,
    const CALDATETIME* lpCalDateTime,
    LPCWSTR lpFormat,
    LPWSTR lpDateStr,
    INT cchDate
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function GetCalendarDateFormatEx(
    <MarshalAs(UnmanagedType.LPWStr)> lpszLocale As String,   ' LPCWSTR
    dwFlags As UInteger,   ' DWORD
    lpCalDateTime As IntPtr,   ' CALDATETIME*
    <MarshalAs(UnmanagedType.LPWStr)> lpFormat As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpDateStr As System.Text.StringBuilder,   ' LPWSTR out
    cchDate As Integer   ' INT
) As Boolean
End Function

' lpszLocale : LPCWSTR
' dwFlags : DWORD
' lpCalDateTime : CALDATETIME*
' lpFormat : LPCWSTR
' lpDateStr : LPWSTR out
' cchDate : INT
Declare PtrSafe Function GetCalendarDateFormatEx Lib "kernel32" ( _
    ByVal lpszLocale As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal lpCalDateTime As LongPtr, _
    ByVal lpFormat As LongPtr, _
    ByVal lpDateStr As LongPtr, _
    ByVal cchDate 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

GetCalendarDateFormatEx = ctypes.windll.kernel32.GetCalendarDateFormatEx
GetCalendarDateFormatEx.restype = wintypes.BOOL
GetCalendarDateFormatEx.argtypes = [
    wintypes.LPCWSTR,  # lpszLocale : LPCWSTR
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.c_void_p,  # lpCalDateTime : CALDATETIME*
    wintypes.LPCWSTR,  # lpFormat : LPCWSTR
    wintypes.LPWSTR,  # lpDateStr : LPWSTR out
    ctypes.c_int,  # cchDate : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetCalendarDateFormatEx = Fiddle::Function.new(
  lib['GetCalendarDateFormatEx'],
  [
    Fiddle::TYPE_VOIDP,  # lpszLocale : LPCWSTR
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # lpCalDateTime : CALDATETIME*
    Fiddle::TYPE_VOIDP,  # lpFormat : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpDateStr : LPWSTR out
    Fiddle::TYPE_INT,  # cchDate : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetCalendarDateFormatEx(
        lpszLocale: *const u16,  // LPCWSTR
        dwFlags: u32,  // DWORD
        lpCalDateTime: *const CALDATETIME,  // CALDATETIME*
        lpFormat: *const u16,  // LPCWSTR
        lpDateStr: *mut u16,  // LPWSTR out
        cchDate: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll")]
public static extern bool GetCalendarDateFormatEx([MarshalAs(UnmanagedType.LPWStr)] string lpszLocale, uint dwFlags, IntPtr lpCalDateTime, [MarshalAs(UnmanagedType.LPWStr)] string lpFormat, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpDateStr, int cchDate);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetCalendarDateFormatEx' -Namespace Win32 -PassThru
# $api::GetCalendarDateFormatEx(lpszLocale, dwFlags, lpCalDateTime, lpFormat, lpDateStr, cchDate)

#uselib "KERNEL32.dll"
#func global GetCalendarDateFormatEx "GetCalendarDateFormatEx" sptr, sptr, sptr, sptr, sptr, sptr
; GetCalendarDateFormatEx lpszLocale, dwFlags, varptr(lpCalDateTime), lpFormat, varptr(lpDateStr), cchDate   ; 戻り値は stat
; lpszLocale : LPCWSTR -> "sptr"
; dwFlags : DWORD -> "sptr"
; lpCalDateTime : CALDATETIME* -> "sptr"
; lpFormat : LPCWSTR -> "sptr"
; lpDateStr : LPWSTR out -> "sptr"
; cchDate : INT -> "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 GetCalendarDateFormatEx "GetCalendarDateFormatEx" wstr, int, var, wstr, var, int
; res = GetCalendarDateFormatEx(lpszLocale, dwFlags, lpCalDateTime, lpFormat, lpDateStr, cchDate)
; lpszLocale : LPCWSTR -> "wstr"
; dwFlags : DWORD -> "int"
; lpCalDateTime : CALDATETIME* -> "var"
; lpFormat : LPCWSTR -> "wstr"
; lpDateStr : LPWSTR out -> "var"
; cchDate : INT -> "int"
; ※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。

; BOOL GetCalendarDateFormatEx(LPCWSTR lpszLocale, DWORD dwFlags, CALDATETIME* lpCalDateTime, LPCWSTR lpFormat, LPWSTR lpDateStr, INT cchDate)
#uselib "KERNEL32.dll"
#cfunc global GetCalendarDateFormatEx "GetCalendarDateFormatEx" wstr, int, var, wstr, var, int
; res = GetCalendarDateFormatEx(lpszLocale, dwFlags, lpCalDateTime, lpFormat, lpDateStr, cchDate)
; lpszLocale : LPCWSTR -> "wstr"
; dwFlags : DWORD -> "int"
; lpCalDateTime : CALDATETIME* -> "var"
; lpFormat : LPCWSTR -> "wstr"
; lpDateStr : LPWSTR out -> "var"
; cchDate : INT -> "int"
; ※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")
	procGetCalendarDateFormatEx = kernel32.NewProc("GetCalendarDateFormatEx")
)

// lpszLocale (LPCWSTR), dwFlags (DWORD), lpCalDateTime (CALDATETIME*), lpFormat (LPCWSTR), lpDateStr (LPWSTR out), cchDate (INT)
r1, _, err := procGetCalendarDateFormatEx.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszLocale))),
	uintptr(dwFlags),
	uintptr(lpCalDateTime),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpFormat))),
	uintptr(lpDateStr),
	uintptr(cchDate),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetCalendarDateFormatEx(
  lpszLocale: PWideChar;   // LPCWSTR
  dwFlags: DWORD;   // DWORD
  lpCalDateTime: Pointer;   // CALDATETIME*
  lpFormat: PWideChar;   // LPCWSTR
  lpDateStr: PWideChar;   // LPWSTR out
  cchDate: Integer   // INT
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetCalendarDateFormatEx';

result := DllCall("KERNEL32\GetCalendarDateFormatEx"
    , "WStr", lpszLocale   ; LPCWSTR
    , "UInt", dwFlags   ; DWORD
    , "Ptr", lpCalDateTime   ; CALDATETIME*
    , "WStr", lpFormat   ; LPCWSTR
    , "Ptr", lpDateStr   ; LPWSTR out
    , "Int", cchDate   ; INT
    , "Int")   ; return: BOOL

●GetCalendarDateFormatEx(lpszLocale, dwFlags, lpCalDateTime, lpFormat, lpDateStr, cchDate) = DLL("KERNEL32.dll", "bool GetCalendarDateFormatEx(char*, dword, void*, char*, char*, int)")
# 呼び出し: GetCalendarDateFormatEx(lpszLocale, dwFlags, lpCalDateTime, lpFormat, lpDateStr, cchDate)
# lpszLocale : LPCWSTR -> "char*"
# dwFlags : DWORD -> "dword"
# lpCalDateTime : CALDATETIME* -> "void*"
# lpFormat : LPCWSTR -> "char*"
# lpDateStr : LPWSTR out -> "char*"
# cchDate : INT -> "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)。