GetEnhMetaFilePaletteEntries

// GDI32.dll
#include <windows.h>

DWORD GetEnhMetaFilePaletteEntries(
    HENHMETAFILE hemf,
    DWORD nNumEntries,
    PALETTEENTRY* lpPaletteEntries   // optional
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function GetEnhMetaFilePaletteEntries(
    hemf As IntPtr,   ' HENHMETAFILE
    nNumEntries As UInteger,   ' DWORD
    lpPaletteEntries As IntPtr   ' PALETTEENTRY* optional, out
) As UInteger
End Function

' hemf : HENHMETAFILE
' nNumEntries : DWORD
' lpPaletteEntries : PALETTEENTRY* optional, out
Declare PtrSafe Function GetEnhMetaFilePaletteEntries Lib "gdi32" ( _
    ByVal hemf As LongPtr, _
    ByVal nNumEntries As Long, _
    ByVal lpPaletteEntries 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

GetEnhMetaFilePaletteEntries = ctypes.windll.gdi32.GetEnhMetaFilePaletteEntries
GetEnhMetaFilePaletteEntries.restype = wintypes.DWORD
GetEnhMetaFilePaletteEntries.argtypes = [
    wintypes.HANDLE,  # hemf : HENHMETAFILE
    wintypes.DWORD,  # nNumEntries : DWORD
    ctypes.c_void_p,  # lpPaletteEntries : PALETTEENTRY* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetEnhMetaFilePaletteEntries = Fiddle::Function.new(
  lib['GetEnhMetaFilePaletteEntries'],
  [
    Fiddle::TYPE_VOIDP,  # hemf : HENHMETAFILE
    -Fiddle::TYPE_INT,  # nNumEntries : DWORD
    Fiddle::TYPE_VOIDP,  # lpPaletteEntries : PALETTEENTRY* optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn GetEnhMetaFilePaletteEntries(
        hemf: *mut core::ffi::c_void,  // HENHMETAFILE
        nNumEntries: u32,  // DWORD
        lpPaletteEntries: *mut PALETTEENTRY  // PALETTEENTRY* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll")]
public static extern uint GetEnhMetaFilePaletteEntries(IntPtr hemf, uint nNumEntries, IntPtr lpPaletteEntries);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetEnhMetaFilePaletteEntries' -Namespace Win32 -PassThru
# $api::GetEnhMetaFilePaletteEntries(hemf, nNumEntries, lpPaletteEntries)

#uselib "GDI32.dll"
#func global GetEnhMetaFilePaletteEntries "GetEnhMetaFilePaletteEntries" sptr, sptr, sptr
; GetEnhMetaFilePaletteEntries hemf, nNumEntries, varptr(lpPaletteEntries)   ; 戻り値は stat
; hemf : HENHMETAFILE -> "sptr"
; nNumEntries : DWORD -> "sptr"
; lpPaletteEntries : PALETTEENTRY* optional, 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 "GDI32.dll"
#cfunc global GetEnhMetaFilePaletteEntries "GetEnhMetaFilePaletteEntries" sptr, int, var
; res = GetEnhMetaFilePaletteEntries(hemf, nNumEntries, lpPaletteEntries)
; hemf : HENHMETAFILE -> "sptr"
; nNumEntries : DWORD -> "int"
; lpPaletteEntries : PALETTEENTRY* optional, 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。

; DWORD GetEnhMetaFilePaletteEntries(HENHMETAFILE hemf, DWORD nNumEntries, PALETTEENTRY* lpPaletteEntries)
#uselib "GDI32.dll"
#cfunc global GetEnhMetaFilePaletteEntries "GetEnhMetaFilePaletteEntries" intptr, int, var
; res = GetEnhMetaFilePaletteEntries(hemf, nNumEntries, lpPaletteEntries)
; hemf : HENHMETAFILE -> "intptr"
; nNumEntries : DWORD -> "int"
; lpPaletteEntries : PALETTEENTRY* optional, 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 (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procGetEnhMetaFilePaletteEntries = gdi32.NewProc("GetEnhMetaFilePaletteEntries")
)

// hemf (HENHMETAFILE), nNumEntries (DWORD), lpPaletteEntries (PALETTEENTRY* optional, out)
r1, _, err := procGetEnhMetaFilePaletteEntries.Call(
	uintptr(hemf),
	uintptr(nNumEntries),
	uintptr(lpPaletteEntries),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetEnhMetaFilePaletteEntries(
  hemf: THandle;   // HENHMETAFILE
  nNumEntries: DWORD;   // DWORD
  lpPaletteEntries: Pointer   // PALETTEENTRY* optional, out
): DWORD; stdcall;
  external 'GDI32.dll' name 'GetEnhMetaFilePaletteEntries';

result := DllCall("GDI32\GetEnhMetaFilePaletteEntries"
    , "Ptr", hemf   ; HENHMETAFILE
    , "UInt", nNumEntries   ; DWORD
    , "Ptr", lpPaletteEntries   ; PALETTEENTRY* optional, out
    , "UInt")   ; return: DWORD

●GetEnhMetaFilePaletteEntries(hemf, nNumEntries, lpPaletteEntries) = DLL("GDI32.dll", "dword GetEnhMetaFilePaletteEntries(void*, dword, void*)")
# 呼び出し: GetEnhMetaFilePaletteEntries(hemf, nNumEntries, lpPaletteEntries)
# hemf : HENHMETAFILE -> "void*"
# nNumEntries : DWORD -> "dword"
# lpPaletteEntries : PALETTEENTRY* optional, 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)。