GetWindowSubclass

// COMCTL32.dll
#include <windows.h>

BOOL GetWindowSubclass(
    HWND hWnd,
    SUBCLASSPROC pfnSubclass,
    UINT_PTR uIdSubclass,
    UINT_PTR* pdwRefData   // optional
);

<DllImport("COMCTL32.dll", ExactSpelling:=True)>
Public Shared Function GetWindowSubclass(
    hWnd As IntPtr,   ' HWND
    pfnSubclass As IntPtr,   ' SUBCLASSPROC
    uIdSubclass As UIntPtr,   ' UINT_PTR
    pdwRefData As IntPtr   ' UINT_PTR* optional, out
) As Boolean
End Function

' hWnd : HWND
' pfnSubclass : SUBCLASSPROC
' uIdSubclass : UINT_PTR
' pdwRefData : UINT_PTR* optional, out
Declare PtrSafe Function GetWindowSubclass Lib "comctl32" ( _
    ByVal hWnd As LongPtr, _
    ByVal pfnSubclass As LongPtr, _
    ByVal uIdSubclass As LongPtr, _
    ByVal pdwRefData As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetWindowSubclass = ctypes.windll.comctl32.GetWindowSubclass
GetWindowSubclass.restype = wintypes.BOOL
GetWindowSubclass.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    ctypes.c_void_p,  # pfnSubclass : SUBCLASSPROC
    ctypes.c_size_t,  # uIdSubclass : UINT_PTR
    ctypes.POINTER(ctypes.c_size_t),  # pdwRefData : UINT_PTR* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('COMCTL32.dll')
GetWindowSubclass = Fiddle::Function.new(
  lib['GetWindowSubclass'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    Fiddle::TYPE_VOIDP,  # pfnSubclass : SUBCLASSPROC
    Fiddle::TYPE_UINTPTR_T,  # uIdSubclass : UINT_PTR
    Fiddle::TYPE_VOIDP,  # pdwRefData : UINT_PTR* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "comctl32")]
extern "system" {
    fn GetWindowSubclass(
        hWnd: *mut core::ffi::c_void,  // HWND
        pfnSubclass: *const core::ffi::c_void,  // SUBCLASSPROC
        uIdSubclass: usize,  // UINT_PTR
        pdwRefData: *mut usize  // UINT_PTR* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("COMCTL32.dll")]
public static extern bool GetWindowSubclass(IntPtr hWnd, IntPtr pfnSubclass, UIntPtr uIdSubclass, IntPtr pdwRefData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'COMCTL32_GetWindowSubclass' -Namespace Win32 -PassThru
# $api::GetWindowSubclass(hWnd, pfnSubclass, uIdSubclass, pdwRefData)

#uselib "COMCTL32.dll"
#func global GetWindowSubclass "GetWindowSubclass" sptr, sptr, sptr, sptr
; GetWindowSubclass hWnd, pfnSubclass, uIdSubclass, varptr(pdwRefData)   ; 戻り値は stat
; hWnd : HWND -> "sptr"
; pfnSubclass : SUBCLASSPROC -> "sptr"
; uIdSubclass : UINT_PTR -> "sptr"
; pdwRefData : UINT_PTR* 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 "COMCTL32.dll"
#cfunc global GetWindowSubclass "GetWindowSubclass" sptr, sptr, sptr, var
; res = GetWindowSubclass(hWnd, pfnSubclass, uIdSubclass, pdwRefData)
; hWnd : HWND -> "sptr"
; pfnSubclass : SUBCLASSPROC -> "sptr"
; uIdSubclass : UINT_PTR -> "sptr"
; pdwRefData : UINT_PTR* 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。

; BOOL GetWindowSubclass(HWND hWnd, SUBCLASSPROC pfnSubclass, UINT_PTR uIdSubclass, UINT_PTR* pdwRefData)
#uselib "COMCTL32.dll"
#cfunc global GetWindowSubclass "GetWindowSubclass" intptr, intptr, intptr, var
; res = GetWindowSubclass(hWnd, pfnSubclass, uIdSubclass, pdwRefData)
; hWnd : HWND -> "intptr"
; pfnSubclass : SUBCLASSPROC -> "intptr"
; uIdSubclass : UINT_PTR -> "intptr"
; pdwRefData : UINT_PTR* 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 (
	comctl32 = windows.NewLazySystemDLL("COMCTL32.dll")
	procGetWindowSubclass = comctl32.NewProc("GetWindowSubclass")
)

// hWnd (HWND), pfnSubclass (SUBCLASSPROC), uIdSubclass (UINT_PTR), pdwRefData (UINT_PTR* optional, out)
r1, _, err := procGetWindowSubclass.Call(
	uintptr(hWnd),
	uintptr(pfnSubclass),
	uintptr(uIdSubclass),
	uintptr(pdwRefData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetWindowSubclass(
  hWnd: THandle;   // HWND
  pfnSubclass: Pointer;   // SUBCLASSPROC
  uIdSubclass: NativeUInt;   // UINT_PTR
  pdwRefData: Pointer   // UINT_PTR* optional, out
): BOOL; stdcall;
  external 'COMCTL32.dll' name 'GetWindowSubclass';

result := DllCall("COMCTL32\GetWindowSubclass"
    , "Ptr", hWnd   ; HWND
    , "Ptr", pfnSubclass   ; SUBCLASSPROC
    , "UPtr", uIdSubclass   ; UINT_PTR
    , "Ptr", pdwRefData   ; UINT_PTR* optional, out
    , "Int")   ; return: BOOL

●GetWindowSubclass(hWnd, pfnSubclass, uIdSubclass, pdwRefData) = DLL("COMCTL32.dll", "bool GetWindowSubclass(void*, void*, int, void*)")
# 呼び出し: GetWindowSubclass(hWnd, pfnSubclass, uIdSubclass, pdwRefData)
# hWnd : HWND -> "void*"
# pfnSubclass : SUBCLASSPROC -> "void*"
# uIdSubclass : UINT_PTR -> "int"
# pdwRefData : UINT_PTR* 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)。