AccessibleChildren

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

HRESULT AccessibleChildren(
    IAccessible* paccContainer,
    INT iChildStart,
    INT cChildren,
    VARIANT* rgvarChildren,
    INT* pcObtained
);

<DllImport("OLEACC.dll", ExactSpelling:=True)>
Public Shared Function AccessibleChildren(
    paccContainer As IntPtr,   ' IAccessible*
    iChildStart As Integer,   ' INT
    cChildren As Integer,   ' INT
    rgvarChildren As IntPtr,   ' VARIANT* out
    <Out> ByRef pcObtained As Integer   ' INT* out
) As Integer
End Function

' paccContainer : IAccessible*
' iChildStart : INT
' cChildren : INT
' rgvarChildren : VARIANT* out
' pcObtained : INT* out
Declare PtrSafe Function AccessibleChildren Lib "oleacc" ( _
    ByVal paccContainer As LongPtr, _
    ByVal iChildStart As Long, _
    ByVal cChildren As Long, _
    ByVal rgvarChildren As LongPtr, _
    ByRef pcObtained 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

AccessibleChildren = ctypes.windll.oleacc.AccessibleChildren
AccessibleChildren.restype = ctypes.c_int
AccessibleChildren.argtypes = [
    ctypes.c_void_p,  # paccContainer : IAccessible*
    ctypes.c_int,  # iChildStart : INT
    ctypes.c_int,  # cChildren : INT
    ctypes.c_void_p,  # rgvarChildren : VARIANT* out
    ctypes.POINTER(ctypes.c_int),  # pcObtained : INT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEACC.dll')
AccessibleChildren = Fiddle::Function.new(
  lib['AccessibleChildren'],
  [
    Fiddle::TYPE_VOIDP,  # paccContainer : IAccessible*
    Fiddle::TYPE_INT,  # iChildStart : INT
    Fiddle::TYPE_INT,  # cChildren : INT
    Fiddle::TYPE_VOIDP,  # rgvarChildren : VARIANT* out
    Fiddle::TYPE_VOIDP,  # pcObtained : INT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleacc")]
extern "system" {
    fn AccessibleChildren(
        paccContainer: *mut core::ffi::c_void,  // IAccessible*
        iChildStart: i32,  // INT
        cChildren: i32,  // INT
        rgvarChildren: *mut VARIANT,  // VARIANT* out
        pcObtained: *mut i32  // INT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEACC.dll")]
public static extern int AccessibleChildren(IntPtr paccContainer, int iChildStart, int cChildren, IntPtr rgvarChildren, out int pcObtained);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEACC_AccessibleChildren' -Namespace Win32 -PassThru
# $api::AccessibleChildren(paccContainer, iChildStart, cChildren, rgvarChildren, pcObtained)

#uselib "OLEACC.dll"
#func global AccessibleChildren "AccessibleChildren" sptr, sptr, sptr, sptr, sptr
; AccessibleChildren paccContainer, iChildStart, cChildren, varptr(rgvarChildren), varptr(pcObtained)   ; 戻り値は stat
; paccContainer : IAccessible* -> "sptr"
; iChildStart : INT -> "sptr"
; cChildren : INT -> "sptr"
; rgvarChildren : VARIANT* out -> "sptr"
; pcObtained : INT* 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 "OLEACC.dll"
#cfunc global AccessibleChildren "AccessibleChildren" sptr, int, int, var, var
; res = AccessibleChildren(paccContainer, iChildStart, cChildren, rgvarChildren, pcObtained)
; paccContainer : IAccessible* -> "sptr"
; iChildStart : INT -> "int"
; cChildren : INT -> "int"
; rgvarChildren : VARIANT* out -> "var"
; pcObtained : INT* 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。

; HRESULT AccessibleChildren(IAccessible* paccContainer, INT iChildStart, INT cChildren, VARIANT* rgvarChildren, INT* pcObtained)
#uselib "OLEACC.dll"
#cfunc global AccessibleChildren "AccessibleChildren" intptr, int, int, var, var
; res = AccessibleChildren(paccContainer, iChildStart, cChildren, rgvarChildren, pcObtained)
; paccContainer : IAccessible* -> "intptr"
; iChildStart : INT -> "int"
; cChildren : INT -> "int"
; rgvarChildren : VARIANT* out -> "var"
; pcObtained : INT* 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 (
	oleacc = windows.NewLazySystemDLL("OLEACC.dll")
	procAccessibleChildren = oleacc.NewProc("AccessibleChildren")
)

// paccContainer (IAccessible*), iChildStart (INT), cChildren (INT), rgvarChildren (VARIANT* out), pcObtained (INT* out)
r1, _, err := procAccessibleChildren.Call(
	uintptr(paccContainer),
	uintptr(iChildStart),
	uintptr(cChildren),
	uintptr(rgvarChildren),
	uintptr(pcObtained),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function AccessibleChildren(
  paccContainer: Pointer;   // IAccessible*
  iChildStart: Integer;   // INT
  cChildren: Integer;   // INT
  rgvarChildren: Pointer;   // VARIANT* out
  pcObtained: Pointer   // INT* out
): Integer; stdcall;
  external 'OLEACC.dll' name 'AccessibleChildren';

result := DllCall("OLEACC\AccessibleChildren"
    , "Ptr", paccContainer   ; IAccessible*
    , "Int", iChildStart   ; INT
    , "Int", cChildren   ; INT
    , "Ptr", rgvarChildren   ; VARIANT* out
    , "Ptr", pcObtained   ; INT* out
    , "Int")   ; return: HRESULT

●AccessibleChildren(paccContainer, iChildStart, cChildren, rgvarChildren, pcObtained) = DLL("OLEACC.dll", "int AccessibleChildren(void*, int, int, void*, void*)")
# 呼び出し: AccessibleChildren(paccContainer, iChildStart, cChildren, rgvarChildren, pcObtained)
# paccContainer : IAccessible* -> "void*"
# iChildStart : INT -> "int"
# cChildren : INT -> "int"
# rgvarChildren : VARIANT* out -> "void*"
# pcObtained : INT* 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)。