MonitorFromWindow

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

HMONITOR MonitorFromWindow(
    HWND hwnd,
    MONITOR_FROM_FLAGS dwFlags
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function MonitorFromWindow(
    hwnd As IntPtr,   ' HWND
    dwFlags As UInteger   ' MONITOR_FROM_FLAGS
) As IntPtr
End Function

' hwnd : HWND
' dwFlags : MONITOR_FROM_FLAGS
Declare PtrSafe Function MonitorFromWindow Lib "user32" ( _
    ByVal hwnd As LongPtr, _
    ByVal dwFlags As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MonitorFromWindow = ctypes.windll.user32.MonitorFromWindow
MonitorFromWindow.restype = ctypes.c_void_p
MonitorFromWindow.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
    wintypes.DWORD,  # dwFlags : MONITOR_FROM_FLAGS
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
MonitorFromWindow = Fiddle::Function.new(
  lib['MonitorFromWindow'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
    -Fiddle::TYPE_INT,  # dwFlags : MONITOR_FROM_FLAGS
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn MonitorFromWindow(
        hwnd: *mut core::ffi::c_void,  // HWND
        dwFlags: u32  // MONITOR_FROM_FLAGS
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern IntPtr MonitorFromWindow(IntPtr hwnd, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_MonitorFromWindow' -Namespace Win32 -PassThru
# $api::MonitorFromWindow(hwnd, dwFlags)

#uselib "USER32.dll"
#func global MonitorFromWindow "MonitorFromWindow" sptr, sptr
; MonitorFromWindow hwnd, dwFlags   ; 戻り値は stat
; hwnd : HWND -> "sptr"
; dwFlags : MONITOR_FROM_FLAGS -> "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 MonitorFromWindow "MonitorFromWindow" sptr, int
; res = MonitorFromWindow(hwnd, dwFlags)
; hwnd : HWND -> "sptr"
; dwFlags : MONITOR_FROM_FLAGS -> "int"

; HMONITOR MonitorFromWindow(HWND hwnd, MONITOR_FROM_FLAGS dwFlags)
#uselib "USER32.dll"
#cfunc global MonitorFromWindow "MonitorFromWindow" intptr, int
; res = MonitorFromWindow(hwnd, dwFlags)
; hwnd : HWND -> "intptr"
; dwFlags : MONITOR_FROM_FLAGS -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procMonitorFromWindow = user32.NewProc("MonitorFromWindow")
)

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

function MonitorFromWindow(
  hwnd: THandle;   // HWND
  dwFlags: DWORD   // MONITOR_FROM_FLAGS
): THandle; stdcall;
  external 'USER32.dll' name 'MonitorFromWindow';

result := DllCall("USER32\MonitorFromWindow"
    , "Ptr", hwnd   ; HWND
    , "UInt", dwFlags   ; MONITOR_FROM_FLAGS
    , "Ptr")   ; return: HMONITOR

●MonitorFromWindow(hwnd, dwFlags) = DLL("USER32.dll", "void* MonitorFromWindow(void*, dword)")
# 呼び出し: MonitorFromWindow(hwnd, dwFlags)
# hwnd : HWND -> "void*"
# dwFlags : MONITOR_FROM_FLAGS -> "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)。