udatpg_setDateTimeFormat

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

void udatpg_setDateTimeFormat(
    const void** dtpg,
    const WORD* dtFormat,
    INT length
);

<DllImport("icuin.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub udatpg_setDateTimeFormat(
    dtpg As IntPtr,   ' void**
    ByRef dtFormat As UShort,   ' WORD*
    length As Integer   ' INT
)
End Sub

' dtpg : void**
' dtFormat : WORD*
' length : INT
Declare PtrSafe Sub udatpg_setDateTimeFormat Lib "icuin" ( _
    ByVal dtpg As LongPtr, _
    ByRef dtFormat As Integer, _
    ByVal length As Long)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

udatpg_setDateTimeFormat = ctypes.cdll.icuin.udatpg_setDateTimeFormat
udatpg_setDateTimeFormat.restype = None
udatpg_setDateTimeFormat.argtypes = [
    ctypes.c_void_p,  # dtpg : void**
    ctypes.POINTER(ctypes.c_ushort),  # dtFormat : WORD*
    ctypes.c_int,  # length : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuin.dll')
udatpg_setDateTimeFormat = Fiddle::Function.new(
  lib['udatpg_setDateTimeFormat'],
  [
    Fiddle::TYPE_VOIDP,  # dtpg : void**
    Fiddle::TYPE_VOIDP,  # dtFormat : WORD*
    Fiddle::TYPE_INT,  # length : INT
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

#[link(name = "icuin")]
extern "C" {
    fn udatpg_setDateTimeFormat(
        dtpg: *const *const (),  // void**
        dtFormat: *const u16,  // WORD*
        length: i32  // INT
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuin.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void udatpg_setDateTimeFormat(IntPtr dtpg, ref ushort dtFormat, int length);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuin_udatpg_setDateTimeFormat' -Namespace Win32 -PassThru
# $api::udatpg_setDateTimeFormat(dtpg, dtFormat, length)

#uselib "icuin.dll"
#func global udatpg_setDateTimeFormat "udatpg_setDateTimeFormat" sptr, sptr, sptr
; udatpg_setDateTimeFormat dtpg, varptr(dtFormat), length
; dtpg : void** -> "sptr"
; dtFormat : WORD* -> "sptr"
; length : INT -> "sptr"

#uselib "icuin.dll"
#func global udatpg_setDateTimeFormat "udatpg_setDateTimeFormat" sptr, var, int
; udatpg_setDateTimeFormat dtpg, dtFormat, length
; dtpg : void** -> "sptr"
; dtFormat : WORD* -> "var"
; length : 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。

; void udatpg_setDateTimeFormat(void** dtpg, WORD* dtFormat, INT length)
#uselib "icuin.dll"
#func global udatpg_setDateTimeFormat "udatpg_setDateTimeFormat" intptr, var, int
; udatpg_setDateTimeFormat dtpg, dtFormat, length
; dtpg : void** -> "intptr"
; dtFormat : WORD* -> "var"
; length : 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 (
	icuin = windows.NewLazySystemDLL("icuin.dll")
	procudatpg_setDateTimeFormat = icuin.NewProc("udatpg_setDateTimeFormat")
)

// dtpg (void**), dtFormat (WORD*), length (INT)
r1, _, err := procudatpg_setDateTimeFormat.Call(
	uintptr(dtpg),
	uintptr(dtFormat),
	uintptr(length),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure udatpg_setDateTimeFormat(
  dtpg: Pointer;   // void**
  dtFormat: Pointer;   // WORD*
  length: Integer   // INT
); cdecl;
  external 'icuin.dll' name 'udatpg_setDateTimeFormat';

result := DllCall("icuin\udatpg_setDateTimeFormat"
    , "Ptr", dtpg   ; void**
    , "Ptr", dtFormat   ; WORD*
    , "Int", length   ; INT
    , "Cdecl Int")   ; return: void

●udatpg_setDateTimeFormat(dtpg, dtFormat, length) = DLL("icuin.dll", "int udatpg_setDateTimeFormat(void*, void*, int)")
# 呼び出し: udatpg_setDateTimeFormat(dtpg, dtFormat, length)
# dtpg : void** -> "void*"
# dtFormat : WORD* -> "void*"
# length : 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。