GetThemeColor

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

HRESULT GetThemeColor(
    HTHEME hTheme,
    INT iPartId,
    INT iStateId,
    INT iPropId,
    COLORREF* pColor
);

<DllImport("UXTHEME.dll", ExactSpelling:=True)>
Public Shared Function GetThemeColor(
    hTheme As IntPtr,   ' HTHEME
    iPartId As Integer,   ' INT
    iStateId As Integer,   ' INT
    iPropId As Integer,   ' INT
    <Out> ByRef pColor As UInteger   ' COLORREF* out
) As Integer
End Function

' hTheme : HTHEME
' iPartId : INT
' iStateId : INT
' iPropId : INT
' pColor : COLORREF* out
Declare PtrSafe Function GetThemeColor Lib "uxtheme" ( _
    ByVal hTheme As LongPtr, _
    ByVal iPartId As Long, _
    ByVal iStateId As Long, _
    ByVal iPropId As Long, _
    ByRef pColor 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

GetThemeColor = ctypes.windll.uxtheme.GetThemeColor
GetThemeColor.restype = ctypes.c_int
GetThemeColor.argtypes = [
    ctypes.c_ssize_t,  # hTheme : HTHEME
    ctypes.c_int,  # iPartId : INT
    ctypes.c_int,  # iStateId : INT
    ctypes.c_int,  # iPropId : INT
    ctypes.c_void_p,  # pColor : COLORREF* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('UXTHEME.dll')
GetThemeColor = Fiddle::Function.new(
  lib['GetThemeColor'],
  [
    Fiddle::TYPE_INTPTR_T,  # hTheme : HTHEME
    Fiddle::TYPE_INT,  # iPartId : INT
    Fiddle::TYPE_INT,  # iStateId : INT
    Fiddle::TYPE_INT,  # iPropId : INT
    Fiddle::TYPE_VOIDP,  # pColor : COLORREF* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "uxtheme")]
extern "system" {
    fn GetThemeColor(
        hTheme: isize,  // HTHEME
        iPartId: i32,  // INT
        iStateId: i32,  // INT
        iPropId: i32,  // INT
        pColor: *mut u32  // COLORREF* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("UXTHEME.dll")]
public static extern int GetThemeColor(IntPtr hTheme, int iPartId, int iStateId, int iPropId, out uint pColor);
"@
$api = Add-Type -MemberDefinition $sig -Name 'UXTHEME_GetThemeColor' -Namespace Win32 -PassThru
# $api::GetThemeColor(hTheme, iPartId, iStateId, iPropId, pColor)

#uselib "UXTHEME.dll"
#func global GetThemeColor "GetThemeColor" sptr, sptr, sptr, sptr, sptr
; GetThemeColor hTheme, iPartId, iStateId, iPropId, pColor   ; 戻り値は stat
; hTheme : HTHEME -> "sptr"
; iPartId : INT -> "sptr"
; iStateId : INT -> "sptr"
; iPropId : INT -> "sptr"
; pColor : COLORREF* 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 GetThemeColor "GetThemeColor" sptr, int, int, int, int
; res = GetThemeColor(hTheme, iPartId, iStateId, iPropId, pColor)
; hTheme : HTHEME -> "sptr"
; iPartId : INT -> "int"
; iStateId : INT -> "int"
; iPropId : INT -> "int"
; pColor : COLORREF* out -> "int"

; HRESULT GetThemeColor(HTHEME hTheme, INT iPartId, INT iStateId, INT iPropId, COLORREF* pColor)
#uselib "UXTHEME.dll"
#cfunc global GetThemeColor "GetThemeColor" intptr, int, int, int, int
; res = GetThemeColor(hTheme, iPartId, iStateId, iPropId, pColor)
; hTheme : HTHEME -> "intptr"
; iPartId : INT -> "int"
; iStateId : INT -> "int"
; iPropId : INT -> "int"
; pColor : COLORREF* out -> "int"

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

var (
	uxtheme = windows.NewLazySystemDLL("UXTHEME.dll")
	procGetThemeColor = uxtheme.NewProc("GetThemeColor")
)

// hTheme (HTHEME), iPartId (INT), iStateId (INT), iPropId (INT), pColor (COLORREF* out)
r1, _, err := procGetThemeColor.Call(
	uintptr(hTheme),
	uintptr(iPartId),
	uintptr(iStateId),
	uintptr(iPropId),
	uintptr(pColor),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetThemeColor(
  hTheme: NativeInt;   // HTHEME
  iPartId: Integer;   // INT
  iStateId: Integer;   // INT
  iPropId: Integer;   // INT
  pColor: Pointer   // COLORREF* out
): Integer; stdcall;
  external 'UXTHEME.dll' name 'GetThemeColor';

result := DllCall("UXTHEME\GetThemeColor"
    , "Ptr", hTheme   ; HTHEME
    , "Int", iPartId   ; INT
    , "Int", iStateId   ; INT
    , "Int", iPropId   ; INT
    , "Ptr", pColor   ; COLORREF* out
    , "Int")   ; return: HRESULT

●GetThemeColor(hTheme, iPartId, iStateId, iPropId, pColor) = DLL("UXTHEME.dll", "int GetThemeColor(int, int, int, int, void*)")
# 呼び出し: GetThemeColor(hTheme, iPartId, iStateId, iPropId, pColor)
# hTheme : HTHEME -> "int"
# iPartId : INT -> "int"
# iStateId : INT -> "int"
# iPropId : INT -> "int"
# pColor : COLORREF* 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)。