DdeAccessData

// USER32.dll
#include <windows.h>

BYTE* DdeAccessData(
    HDDEDATA hData,
    DWORD* pcbDataSize   // optional
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function DdeAccessData(
    hData As IntPtr,   ' HDDEDATA
    pcbDataSize As IntPtr   ' DWORD* optional, out
) As IntPtr
End Function

' hData : HDDEDATA
' pcbDataSize : DWORD* optional, out
Declare PtrSafe Function DdeAccessData Lib "user32" ( _
    ByVal hData As LongPtr, _
    ByVal pcbDataSize As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DdeAccessData = ctypes.windll.user32.DdeAccessData
DdeAccessData.restype = ctypes.c_void_p
DdeAccessData.argtypes = [
    wintypes.HANDLE,  # hData : HDDEDATA
    ctypes.POINTER(wintypes.DWORD),  # pcbDataSize : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
DdeAccessData = Fiddle::Function.new(
  lib['DdeAccessData'],
  [
    Fiddle::TYPE_VOIDP,  # hData : HDDEDATA
    Fiddle::TYPE_VOIDP,  # pcbDataSize : DWORD* optional, out
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn DdeAccessData(
        hData: *mut core::ffi::c_void,  // HDDEDATA
        pcbDataSize: *mut u32  // DWORD* optional, out
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern IntPtr DdeAccessData(IntPtr hData, IntPtr pcbDataSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_DdeAccessData' -Namespace Win32 -PassThru
# $api::DdeAccessData(hData, pcbDataSize)

#uselib "USER32.dll"
#func global DdeAccessData "DdeAccessData" sptr, sptr
; DdeAccessData hData, varptr(pcbDataSize)   ; 戻り値は stat
; hData : HDDEDATA -> "sptr"
; pcbDataSize : DWORD* optional, out -> "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 "USER32.dll"
#cfunc global DdeAccessData "DdeAccessData" sptr, var
; res = DdeAccessData(hData, pcbDataSize)
; hData : HDDEDATA -> "sptr"
; pcbDataSize : 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。

; BYTE* DdeAccessData(HDDEDATA hData, DWORD* pcbDataSize)
#uselib "USER32.dll"
#cfunc global DdeAccessData "DdeAccessData" intptr, var
; res = DdeAccessData(hData, pcbDataSize)
; hData : HDDEDATA -> "intptr"
; pcbDataSize : 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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procDdeAccessData = user32.NewProc("DdeAccessData")
)

// hData (HDDEDATA), pcbDataSize (DWORD* optional, out)
r1, _, err := procDdeAccessData.Call(
	uintptr(hData),
	uintptr(pcbDataSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BYTE*

function DdeAccessData(
  hData: THandle;   // HDDEDATA
  pcbDataSize: Pointer   // DWORD* optional, out
): Pointer; stdcall;
  external 'USER32.dll' name 'DdeAccessData';

result := DllCall("USER32\DdeAccessData"
    , "Ptr", hData   ; HDDEDATA
    , "Ptr", pcbDataSize   ; DWORD* optional, out
    , "Ptr")   ; return: BYTE*

●DdeAccessData(hData, pcbDataSize) = DLL("USER32.dll", "void* DdeAccessData(void*, void*)")
# 呼び出し: DdeAccessData(hData, pcbDataSize)
# hData : HDDEDATA -> "void*"
# pcbDataSize : 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)。