GetProcessHandleFromHwnd

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

HANDLE GetProcessHandleFromHwnd(
    HWND hwnd
);

<DllImport("OLEACC.dll", ExactSpelling:=True)>
Public Shared Function GetProcessHandleFromHwnd(
    hwnd As IntPtr   ' HWND
) As IntPtr
End Function

' hwnd : HWND
Declare PtrSafe Function GetProcessHandleFromHwnd Lib "oleacc" ( _
    ByVal hwnd 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

GetProcessHandleFromHwnd = ctypes.windll.oleacc.GetProcessHandleFromHwnd
GetProcessHandleFromHwnd.restype = ctypes.c_void_p
GetProcessHandleFromHwnd.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEACC.dll')
GetProcessHandleFromHwnd = Fiddle::Function.new(
  lib['GetProcessHandleFromHwnd'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "oleacc")]
extern "system" {
    fn GetProcessHandleFromHwnd(
        hwnd: *mut core::ffi::c_void  // HWND
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEACC.dll")]
public static extern IntPtr GetProcessHandleFromHwnd(IntPtr hwnd);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEACC_GetProcessHandleFromHwnd' -Namespace Win32 -PassThru
# $api::GetProcessHandleFromHwnd(hwnd)

#uselib "OLEACC.dll"
#func global GetProcessHandleFromHwnd "GetProcessHandleFromHwnd" sptr
; GetProcessHandleFromHwnd hwnd   ; 戻り値は stat
; hwnd : HWND -> "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 GetProcessHandleFromHwnd "GetProcessHandleFromHwnd" sptr
; res = GetProcessHandleFromHwnd(hwnd)
; hwnd : HWND -> "sptr"

; HANDLE GetProcessHandleFromHwnd(HWND hwnd)
#uselib "OLEACC.dll"
#cfunc global GetProcessHandleFromHwnd "GetProcessHandleFromHwnd" intptr
; res = GetProcessHandleFromHwnd(hwnd)
; hwnd : HWND -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	oleacc = windows.NewLazySystemDLL("OLEACC.dll")
	procGetProcessHandleFromHwnd = oleacc.NewProc("GetProcessHandleFromHwnd")
)

// hwnd (HWND)
r1, _, err := procGetProcessHandleFromHwnd.Call(
	uintptr(hwnd),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HANDLE

function GetProcessHandleFromHwnd(
  hwnd: THandle   // HWND
): THandle; stdcall;
  external 'OLEACC.dll' name 'GetProcessHandleFromHwnd';

result := DllCall("OLEACC\GetProcessHandleFromHwnd"
    , "Ptr", hwnd   ; HWND
    , "Ptr")   ; return: HANDLE

●GetProcessHandleFromHwnd(hwnd) = DLL("OLEACC.dll", "void* GetProcessHandleFromHwnd(void*)")
# 呼び出し: GetProcessHandleFromHwnd(hwnd)
# hwnd : HWND -> "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)。