GetThemeBackgroundExtent

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

HRESULT GetThemeBackgroundExtent(
    HTHEME hTheme,
    HDC hdc,   // optional
    INT iPartId,
    INT iStateId,
    RECT* pContentRect,
    RECT* pExtentRect
);

<DllImport("UXTHEME.dll", ExactSpelling:=True)>
Public Shared Function GetThemeBackgroundExtent(
    hTheme As IntPtr,   ' HTHEME
    hdc As IntPtr,   ' HDC optional
    iPartId As Integer,   ' INT
    iStateId As Integer,   ' INT
    pContentRect As IntPtr,   ' RECT*
    pExtentRect As IntPtr   ' RECT* out
) As Integer
End Function

' hTheme : HTHEME
' hdc : HDC optional
' iPartId : INT
' iStateId : INT
' pContentRect : RECT*
' pExtentRect : RECT* out
Declare PtrSafe Function GetThemeBackgroundExtent Lib "uxtheme" ( _
    ByVal hTheme As LongPtr, _
    ByVal hdc As LongPtr, _
    ByVal iPartId As Long, _
    ByVal iStateId As Long, _
    ByVal pContentRect As LongPtr, _
    ByVal pExtentRect 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

GetThemeBackgroundExtent = ctypes.windll.uxtheme.GetThemeBackgroundExtent
GetThemeBackgroundExtent.restype = ctypes.c_int
GetThemeBackgroundExtent.argtypes = [
    ctypes.c_ssize_t,  # hTheme : HTHEME
    wintypes.HANDLE,  # hdc : HDC optional
    ctypes.c_int,  # iPartId : INT
    ctypes.c_int,  # iStateId : INT
    ctypes.c_void_p,  # pContentRect : RECT*
    ctypes.c_void_p,  # pExtentRect : RECT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('UXTHEME.dll')
GetThemeBackgroundExtent = Fiddle::Function.new(
  lib['GetThemeBackgroundExtent'],
  [
    Fiddle::TYPE_INTPTR_T,  # hTheme : HTHEME
    Fiddle::TYPE_VOIDP,  # hdc : HDC optional
    Fiddle::TYPE_INT,  # iPartId : INT
    Fiddle::TYPE_INT,  # iStateId : INT
    Fiddle::TYPE_VOIDP,  # pContentRect : RECT*
    Fiddle::TYPE_VOIDP,  # pExtentRect : RECT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "uxtheme")]
extern "system" {
    fn GetThemeBackgroundExtent(
        hTheme: isize,  // HTHEME
        hdc: *mut core::ffi::c_void,  // HDC optional
        iPartId: i32,  // INT
        iStateId: i32,  // INT
        pContentRect: *mut RECT,  // RECT*
        pExtentRect: *mut RECT  // RECT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("UXTHEME.dll")]
public static extern int GetThemeBackgroundExtent(IntPtr hTheme, IntPtr hdc, int iPartId, int iStateId, IntPtr pContentRect, IntPtr pExtentRect);
"@
$api = Add-Type -MemberDefinition $sig -Name 'UXTHEME_GetThemeBackgroundExtent' -Namespace Win32 -PassThru
# $api::GetThemeBackgroundExtent(hTheme, hdc, iPartId, iStateId, pContentRect, pExtentRect)

#uselib "UXTHEME.dll"
#func global GetThemeBackgroundExtent "GetThemeBackgroundExtent" sptr, sptr, sptr, sptr, sptr, sptr
; GetThemeBackgroundExtent hTheme, hdc, iPartId, iStateId, varptr(pContentRect), varptr(pExtentRect)   ; 戻り値は stat
; hTheme : HTHEME -> "sptr"
; hdc : HDC optional -> "sptr"
; iPartId : INT -> "sptr"
; iStateId : INT -> "sptr"
; pContentRect : RECT* -> "sptr"
; pExtentRect : RECT* 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 "UXTHEME.dll"
#cfunc global GetThemeBackgroundExtent "GetThemeBackgroundExtent" sptr, sptr, int, int, var, var
; res = GetThemeBackgroundExtent(hTheme, hdc, iPartId, iStateId, pContentRect, pExtentRect)
; hTheme : HTHEME -> "sptr"
; hdc : HDC optional -> "sptr"
; iPartId : INT -> "int"
; iStateId : INT -> "int"
; pContentRect : RECT* -> "var"
; pExtentRect : RECT* 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 GetThemeBackgroundExtent(HTHEME hTheme, HDC hdc, INT iPartId, INT iStateId, RECT* pContentRect, RECT* pExtentRect)
#uselib "UXTHEME.dll"
#cfunc global GetThemeBackgroundExtent "GetThemeBackgroundExtent" intptr, intptr, int, int, var, var
; res = GetThemeBackgroundExtent(hTheme, hdc, iPartId, iStateId, pContentRect, pExtentRect)
; hTheme : HTHEME -> "intptr"
; hdc : HDC optional -> "intptr"
; iPartId : INT -> "int"
; iStateId : INT -> "int"
; pContentRect : RECT* -> "var"
; pExtentRect : RECT* 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 (
	uxtheme = windows.NewLazySystemDLL("UXTHEME.dll")
	procGetThemeBackgroundExtent = uxtheme.NewProc("GetThemeBackgroundExtent")
)

// hTheme (HTHEME), hdc (HDC optional), iPartId (INT), iStateId (INT), pContentRect (RECT*), pExtentRect (RECT* out)
r1, _, err := procGetThemeBackgroundExtent.Call(
	uintptr(hTheme),
	uintptr(hdc),
	uintptr(iPartId),
	uintptr(iStateId),
	uintptr(pContentRect),
	uintptr(pExtentRect),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetThemeBackgroundExtent(
  hTheme: NativeInt;   // HTHEME
  hdc: THandle;   // HDC optional
  iPartId: Integer;   // INT
  iStateId: Integer;   // INT
  pContentRect: Pointer;   // RECT*
  pExtentRect: Pointer   // RECT* out
): Integer; stdcall;
  external 'UXTHEME.dll' name 'GetThemeBackgroundExtent';

result := DllCall("UXTHEME\GetThemeBackgroundExtent"
    , "Ptr", hTheme   ; HTHEME
    , "Ptr", hdc   ; HDC optional
    , "Int", iPartId   ; INT
    , "Int", iStateId   ; INT
    , "Ptr", pContentRect   ; RECT*
    , "Ptr", pExtentRect   ; RECT* out
    , "Int")   ; return: HRESULT

●GetThemeBackgroundExtent(hTheme, hdc, iPartId, iStateId, pContentRect, pExtentRect) = DLL("UXTHEME.dll", "int GetThemeBackgroundExtent(int, void*, int, int, void*, void*)")
# 呼び出し: GetThemeBackgroundExtent(hTheme, hdc, iPartId, iStateId, pContentRect, pExtentRect)
# hTheme : HTHEME -> "int"
# hdc : HDC optional -> "void*"
# iPartId : INT -> "int"
# iStateId : INT -> "int"
# pContentRect : RECT* -> "void*"
# pExtentRect : RECT* 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)。