DwmSetIconicThumbnail

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

HRESULT DwmSetIconicThumbnail(
    HWND hwnd,
    HBITMAP hbmp,
    DWORD dwSITFlags
);

<DllImport("dwmapi.dll", ExactSpelling:=True)>
Public Shared Function DwmSetIconicThumbnail(
    hwnd As IntPtr,   ' HWND
    hbmp As IntPtr,   ' HBITMAP
    dwSITFlags As UInteger   ' DWORD
) As Integer
End Function

' hwnd : HWND
' hbmp : HBITMAP
' dwSITFlags : DWORD
Declare PtrSafe Function DwmSetIconicThumbnail Lib "dwmapi" ( _
    ByVal hwnd As LongPtr, _
    ByVal hbmp As LongPtr, _
    ByVal dwSITFlags 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

DwmSetIconicThumbnail = ctypes.windll.dwmapi.DwmSetIconicThumbnail
DwmSetIconicThumbnail.restype = ctypes.c_int
DwmSetIconicThumbnail.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
    wintypes.HANDLE,  # hbmp : HBITMAP
    wintypes.DWORD,  # dwSITFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dwmapi.dll')
DwmSetIconicThumbnail = Fiddle::Function.new(
  lib['DwmSetIconicThumbnail'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
    Fiddle::TYPE_VOIDP,  # hbmp : HBITMAP
    -Fiddle::TYPE_INT,  # dwSITFlags : DWORD
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("dwmapi.dll")]
public static extern int DwmSetIconicThumbnail(IntPtr hwnd, IntPtr hbmp, uint dwSITFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dwmapi_DwmSetIconicThumbnail' -Namespace Win32 -PassThru
# $api::DwmSetIconicThumbnail(hwnd, hbmp, dwSITFlags)

#uselib "dwmapi.dll"
#func global DwmSetIconicThumbnail "DwmSetIconicThumbnail" sptr, sptr, sptr
; DwmSetIconicThumbnail hwnd, hbmp, dwSITFlags   ; 戻り値は stat
; hwnd : HWND -> "sptr"
; hbmp : HBITMAP -> "sptr"
; dwSITFlags : 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 DwmSetIconicThumbnail "DwmSetIconicThumbnail" sptr, sptr, int
; res = DwmSetIconicThumbnail(hwnd, hbmp, dwSITFlags)
; hwnd : HWND -> "sptr"
; hbmp : HBITMAP -> "sptr"
; dwSITFlags : DWORD -> "int"

; HRESULT DwmSetIconicThumbnail(HWND hwnd, HBITMAP hbmp, DWORD dwSITFlags)
#uselib "dwmapi.dll"
#cfunc global DwmSetIconicThumbnail "DwmSetIconicThumbnail" intptr, intptr, int
; res = DwmSetIconicThumbnail(hwnd, hbmp, dwSITFlags)
; hwnd : HWND -> "intptr"
; hbmp : HBITMAP -> "intptr"
; dwSITFlags : DWORD -> "int"

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

var (
	dwmapi = windows.NewLazySystemDLL("dwmapi.dll")
	procDwmSetIconicThumbnail = dwmapi.NewProc("DwmSetIconicThumbnail")
)

// hwnd (HWND), hbmp (HBITMAP), dwSITFlags (DWORD)
r1, _, err := procDwmSetIconicThumbnail.Call(
	uintptr(hwnd),
	uintptr(hbmp),
	uintptr(dwSITFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DwmSetIconicThumbnail(
  hwnd: THandle;   // HWND
  hbmp: THandle;   // HBITMAP
  dwSITFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'dwmapi.dll' name 'DwmSetIconicThumbnail';

result := DllCall("dwmapi\DwmSetIconicThumbnail"
    , "Ptr", hwnd   ; HWND
    , "Ptr", hbmp   ; HBITMAP
    , "UInt", dwSITFlags   ; DWORD
    , "Int")   ; return: HRESULT

●DwmSetIconicThumbnail(hwnd, hbmp, dwSITFlags) = DLL("dwmapi.dll", "int DwmSetIconicThumbnail(void*, void*, dword)")
# 呼び出し: DwmSetIconicThumbnail(hwnd, hbmp, dwSITFlags)
# hwnd : HWND -> "void*"
# hbmp : HBITMAP -> "void*"
# dwSITFlags : 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)。