DwmGetWindowAttribute

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

HRESULT DwmGetWindowAttribute(
    HWND hwnd,
    DWORD dwAttribute,
    void* pvAttribute,
    DWORD cbAttribute
);

<DllImport("dwmapi.dll", ExactSpelling:=True)>
Public Shared Function DwmGetWindowAttribute(
    hwnd As IntPtr,   ' HWND
    dwAttribute As UInteger,   ' DWORD
    pvAttribute As IntPtr,   ' void* out
    cbAttribute As UInteger   ' DWORD
) As Integer
End Function

' hwnd : HWND
' dwAttribute : DWORD
' pvAttribute : void* out
' cbAttribute : DWORD
Declare PtrSafe Function DwmGetWindowAttribute Lib "dwmapi" ( _
    ByVal hwnd As LongPtr, _
    ByVal dwAttribute As Long, _
    ByVal pvAttribute As LongPtr, _
    ByVal cbAttribute 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

DwmGetWindowAttribute = ctypes.windll.dwmapi.DwmGetWindowAttribute
DwmGetWindowAttribute.restype = ctypes.c_int
DwmGetWindowAttribute.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
    wintypes.DWORD,  # dwAttribute : DWORD
    ctypes.POINTER(None),  # pvAttribute : void* out
    wintypes.DWORD,  # cbAttribute : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dwmapi.dll')
DwmGetWindowAttribute = Fiddle::Function.new(
  lib['DwmGetWindowAttribute'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
    -Fiddle::TYPE_INT,  # dwAttribute : DWORD
    Fiddle::TYPE_VOIDP,  # pvAttribute : void* out
    -Fiddle::TYPE_INT,  # cbAttribute : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "dwmapi")]
extern "system" {
    fn DwmGetWindowAttribute(
        hwnd: *mut core::ffi::c_void,  // HWND
        dwAttribute: u32,  // DWORD
        pvAttribute: *mut (),  // void* out
        cbAttribute: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dwmapi.dll")]
public static extern int DwmGetWindowAttribute(IntPtr hwnd, uint dwAttribute, IntPtr pvAttribute, uint cbAttribute);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dwmapi_DwmGetWindowAttribute' -Namespace Win32 -PassThru
# $api::DwmGetWindowAttribute(hwnd, dwAttribute, pvAttribute, cbAttribute)

#uselib "dwmapi.dll"
#func global DwmGetWindowAttribute "DwmGetWindowAttribute" sptr, sptr, sptr, sptr
; DwmGetWindowAttribute hwnd, dwAttribute, pvAttribute, cbAttribute   ; 戻り値は stat
; hwnd : HWND -> "sptr"
; dwAttribute : DWORD -> "sptr"
; pvAttribute : void* out -> "sptr"
; cbAttribute : DWORD -> "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 "dwmapi.dll"
#cfunc global DwmGetWindowAttribute "DwmGetWindowAttribute" sptr, int, sptr, int
; res = DwmGetWindowAttribute(hwnd, dwAttribute, pvAttribute, cbAttribute)
; hwnd : HWND -> "sptr"
; dwAttribute : DWORD -> "int"
; pvAttribute : void* out -> "sptr"
; cbAttribute : DWORD -> "int"

; HRESULT DwmGetWindowAttribute(HWND hwnd, DWORD dwAttribute, void* pvAttribute, DWORD cbAttribute)
#uselib "dwmapi.dll"
#cfunc global DwmGetWindowAttribute "DwmGetWindowAttribute" intptr, int, intptr, int
; res = DwmGetWindowAttribute(hwnd, dwAttribute, pvAttribute, cbAttribute)
; hwnd : HWND -> "intptr"
; dwAttribute : DWORD -> "int"
; pvAttribute : void* out -> "intptr"
; cbAttribute : DWORD -> "int"

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

var (
	dwmapi = windows.NewLazySystemDLL("dwmapi.dll")
	procDwmGetWindowAttribute = dwmapi.NewProc("DwmGetWindowAttribute")
)

// hwnd (HWND), dwAttribute (DWORD), pvAttribute (void* out), cbAttribute (DWORD)
r1, _, err := procDwmGetWindowAttribute.Call(
	uintptr(hwnd),
	uintptr(dwAttribute),
	uintptr(pvAttribute),
	uintptr(cbAttribute),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DwmGetWindowAttribute(
  hwnd: THandle;   // HWND
  dwAttribute: DWORD;   // DWORD
  pvAttribute: Pointer;   // void* out
  cbAttribute: DWORD   // DWORD
): Integer; stdcall;
  external 'dwmapi.dll' name 'DwmGetWindowAttribute';

result := DllCall("dwmapi\DwmGetWindowAttribute"
    , "Ptr", hwnd   ; HWND
    , "UInt", dwAttribute   ; DWORD
    , "Ptr", pvAttribute   ; void* out
    , "UInt", cbAttribute   ; DWORD
    , "Int")   ; return: HRESULT

●DwmGetWindowAttribute(hwnd, dwAttribute, pvAttribute, cbAttribute) = DLL("dwmapi.dll", "int DwmGetWindowAttribute(void*, dword, void*, dword)")
# 呼び出し: DwmGetWindowAttribute(hwnd, dwAttribute, pvAttribute, cbAttribute)
# hwnd : HWND -> "void*"
# dwAttribute : DWORD -> "dword"
# pvAttribute : void* out -> "void*"
# cbAttribute : DWORD -> "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)。