DdeInitializeW

// USER32.dll  (Unicode / -W)
#include <windows.h>

DWORD DdeInitializeW(
    DWORD* pidInst,
    PFNCALLBACK pfnCallback,
    DDE_INITIALIZE_COMMAND afCmd,
    DWORD ulRes   // optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function DdeInitializeW(
    ByRef pidInst As UInteger,   ' DWORD* in/out
    pfnCallback As IntPtr,   ' PFNCALLBACK
    afCmd As UInteger,   ' DDE_INITIALIZE_COMMAND
    ulRes As UInteger   ' DWORD optional
) As UInteger
End Function

' pidInst : DWORD* in/out
' pfnCallback : PFNCALLBACK
' afCmd : DDE_INITIALIZE_COMMAND
' ulRes : DWORD optional
Declare PtrSafe Function DdeInitializeW Lib "user32" ( _
    ByRef pidInst As Long, _
    ByVal pfnCallback As LongPtr, _
    ByVal afCmd As Long, _
    ByVal ulRes 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

DdeInitializeW = ctypes.windll.user32.DdeInitializeW
DdeInitializeW.restype = wintypes.DWORD
DdeInitializeW.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # pidInst : DWORD* in/out
    ctypes.c_void_p,  # pfnCallback : PFNCALLBACK
    wintypes.DWORD,  # afCmd : DDE_INITIALIZE_COMMAND
    wintypes.DWORD,  # ulRes : DWORD optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
DdeInitializeW = Fiddle::Function.new(
  lib['DdeInitializeW'],
  [
    Fiddle::TYPE_VOIDP,  # pidInst : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # pfnCallback : PFNCALLBACK
    -Fiddle::TYPE_INT,  # afCmd : DDE_INITIALIZE_COMMAND
    -Fiddle::TYPE_INT,  # ulRes : DWORD optional
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn DdeInitializeW(
        pidInst: *mut u32,  // DWORD* in/out
        pfnCallback: *const core::ffi::c_void,  // PFNCALLBACK
        afCmd: u32,  // DDE_INITIALIZE_COMMAND
        ulRes: u32  // DWORD optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern uint DdeInitializeW(ref uint pidInst, IntPtr pfnCallback, uint afCmd, uint ulRes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_DdeInitializeW' -Namespace Win32 -PassThru
# $api::DdeInitializeW(pidInst, pfnCallback, afCmd, ulRes)

#uselib "USER32.dll"
#func global DdeInitializeW "DdeInitializeW" wptr, wptr, wptr, wptr
; DdeInitializeW varptr(pidInst), pfnCallback, afCmd, ulRes   ; 戻り値は stat
; pidInst : DWORD* in/out -> "wptr"
; pfnCallback : PFNCALLBACK -> "wptr"
; afCmd : DDE_INITIALIZE_COMMAND -> "wptr"
; ulRes : DWORD optional -> "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 "USER32.dll"
#cfunc global DdeInitializeW "DdeInitializeW" var, sptr, int, int
; res = DdeInitializeW(pidInst, pfnCallback, afCmd, ulRes)
; pidInst : DWORD* in/out -> "var"
; pfnCallback : PFNCALLBACK -> "sptr"
; afCmd : DDE_INITIALIZE_COMMAND -> "int"
; ulRes : DWORD optional -> "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。

; DWORD DdeInitializeW(DWORD* pidInst, PFNCALLBACK pfnCallback, DDE_INITIALIZE_COMMAND afCmd, DWORD ulRes)
#uselib "USER32.dll"
#cfunc global DdeInitializeW "DdeInitializeW" var, intptr, int, int
; res = DdeInitializeW(pidInst, pfnCallback, afCmd, ulRes)
; pidInst : DWORD* in/out -> "var"
; pfnCallback : PFNCALLBACK -> "intptr"
; afCmd : DDE_INITIALIZE_COMMAND -> "int"
; ulRes : DWORD optional -> "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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procDdeInitializeW = user32.NewProc("DdeInitializeW")
)

// pidInst (DWORD* in/out), pfnCallback (PFNCALLBACK), afCmd (DDE_INITIALIZE_COMMAND), ulRes (DWORD optional)
r1, _, err := procDdeInitializeW.Call(
	uintptr(pidInst),
	uintptr(pfnCallback),
	uintptr(afCmd),
	uintptr(ulRes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DdeInitializeW(
  pidInst: Pointer;   // DWORD* in/out
  pfnCallback: Pointer;   // PFNCALLBACK
  afCmd: DWORD;   // DDE_INITIALIZE_COMMAND
  ulRes: DWORD   // DWORD optional
): DWORD; stdcall;
  external 'USER32.dll' name 'DdeInitializeW';

result := DllCall("USER32\DdeInitializeW"
    , "Ptr", pidInst   ; DWORD* in/out
    , "Ptr", pfnCallback   ; PFNCALLBACK
    , "UInt", afCmd   ; DDE_INITIALIZE_COMMAND
    , "UInt", ulRes   ; DWORD optional
    , "UInt")   ; return: DWORD

●DdeInitializeW(pidInst, pfnCallback, afCmd, ulRes) = DLL("USER32.dll", "dword DdeInitializeW(void*, void*, dword, dword)")
# 呼び出し: DdeInitializeW(pidInst, pfnCallback, afCmd, ulRes)
# pidInst : DWORD* in/out -> "void*"
# pfnCallback : PFNCALLBACK -> "void*"
# afCmd : DDE_INITIALIZE_COMMAND -> "dword"
# ulRes : DWORD optional -> "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。