DwmRegisterThumbnail

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

HRESULT DwmRegisterThumbnail(
    HWND hwndDestination,
    HWND hwndSource,
    INT_PTR* phThumbnailId
);

<DllImport("dwmapi.dll", ExactSpelling:=True)>
Public Shared Function DwmRegisterThumbnail(
    hwndDestination As IntPtr,   ' HWND
    hwndSource As IntPtr,   ' HWND
    <Out> ByRef phThumbnailId As IntPtr   ' INT_PTR* out
) As Integer
End Function

' hwndDestination : HWND
' hwndSource : HWND
' phThumbnailId : INT_PTR* out
Declare PtrSafe Function DwmRegisterThumbnail Lib "dwmapi" ( _
    ByVal hwndDestination As LongPtr, _
    ByVal hwndSource As LongPtr, _
    ByRef phThumbnailId 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

DwmRegisterThumbnail = ctypes.windll.dwmapi.DwmRegisterThumbnail
DwmRegisterThumbnail.restype = ctypes.c_int
DwmRegisterThumbnail.argtypes = [
    wintypes.HANDLE,  # hwndDestination : HWND
    wintypes.HANDLE,  # hwndSource : HWND
    ctypes.POINTER(ctypes.c_ssize_t),  # phThumbnailId : INT_PTR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dwmapi.dll')
DwmRegisterThumbnail = Fiddle::Function.new(
  lib['DwmRegisterThumbnail'],
  [
    Fiddle::TYPE_VOIDP,  # hwndDestination : HWND
    Fiddle::TYPE_VOIDP,  # hwndSource : HWND
    Fiddle::TYPE_VOIDP,  # phThumbnailId : INT_PTR* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "dwmapi")]
extern "system" {
    fn DwmRegisterThumbnail(
        hwndDestination: *mut core::ffi::c_void,  // HWND
        hwndSource: *mut core::ffi::c_void,  // HWND
        phThumbnailId: *mut isize  // INT_PTR* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dwmapi.dll")]
public static extern int DwmRegisterThumbnail(IntPtr hwndDestination, IntPtr hwndSource, out IntPtr phThumbnailId);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dwmapi_DwmRegisterThumbnail' -Namespace Win32 -PassThru
# $api::DwmRegisterThumbnail(hwndDestination, hwndSource, phThumbnailId)

#uselib "dwmapi.dll"
#func global DwmRegisterThumbnail "DwmRegisterThumbnail" sptr, sptr, sptr
; DwmRegisterThumbnail hwndDestination, hwndSource, varptr(phThumbnailId)   ; 戻り値は stat
; hwndDestination : HWND -> "sptr"
; hwndSource : HWND -> "sptr"
; phThumbnailId : INT_PTR* 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 "dwmapi.dll"
#cfunc global DwmRegisterThumbnail "DwmRegisterThumbnail" sptr, sptr, var
; res = DwmRegisterThumbnail(hwndDestination, hwndSource, phThumbnailId)
; hwndDestination : HWND -> "sptr"
; hwndSource : HWND -> "sptr"
; phThumbnailId : INT_PTR* 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 DwmRegisterThumbnail(HWND hwndDestination, HWND hwndSource, INT_PTR* phThumbnailId)
#uselib "dwmapi.dll"
#cfunc global DwmRegisterThumbnail "DwmRegisterThumbnail" intptr, intptr, var
; res = DwmRegisterThumbnail(hwndDestination, hwndSource, phThumbnailId)
; hwndDestination : HWND -> "intptr"
; hwndSource : HWND -> "intptr"
; phThumbnailId : INT_PTR* 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 (
	dwmapi = windows.NewLazySystemDLL("dwmapi.dll")
	procDwmRegisterThumbnail = dwmapi.NewProc("DwmRegisterThumbnail")
)

// hwndDestination (HWND), hwndSource (HWND), phThumbnailId (INT_PTR* out)
r1, _, err := procDwmRegisterThumbnail.Call(
	uintptr(hwndDestination),
	uintptr(hwndSource),
	uintptr(phThumbnailId),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DwmRegisterThumbnail(
  hwndDestination: THandle;   // HWND
  hwndSource: THandle;   // HWND
  phThumbnailId: Pointer   // INT_PTR* out
): Integer; stdcall;
  external 'dwmapi.dll' name 'DwmRegisterThumbnail';

result := DllCall("dwmapi\DwmRegisterThumbnail"
    , "Ptr", hwndDestination   ; HWND
    , "Ptr", hwndSource   ; HWND
    , "Ptr", phThumbnailId   ; INT_PTR* out
    , "Int")   ; return: HRESULT

●DwmRegisterThumbnail(hwndDestination, hwndSource, phThumbnailId) = DLL("dwmapi.dll", "int DwmRegisterThumbnail(void*, void*, void*)")
# 呼び出し: DwmRegisterThumbnail(hwndDestination, hwndSource, phThumbnailId)
# hwndDestination : HWND -> "void*"
# hwndSource : HWND -> "void*"
# phThumbnailId : INT_PTR* 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)。