GetEnhMetaFileHeader

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

DWORD GetEnhMetaFileHeader(
    HENHMETAFILE hemf,
    DWORD nSize,
    ENHMETAHEADER* lpEnhMetaHeader   // optional
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function GetEnhMetaFileHeader(
    hemf As IntPtr,   ' HENHMETAFILE
    nSize As UInteger,   ' DWORD
    lpEnhMetaHeader As IntPtr   ' ENHMETAHEADER* optional, out
) As UInteger
End Function

' hemf : HENHMETAFILE
' nSize : DWORD
' lpEnhMetaHeader : ENHMETAHEADER* optional, out
Declare PtrSafe Function GetEnhMetaFileHeader Lib "gdi32" ( _
    ByVal hemf As LongPtr, _
    ByVal nSize As Long, _
    ByVal lpEnhMetaHeader 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

GetEnhMetaFileHeader = ctypes.windll.gdi32.GetEnhMetaFileHeader
GetEnhMetaFileHeader.restype = wintypes.DWORD
GetEnhMetaFileHeader.argtypes = [
    wintypes.HANDLE,  # hemf : HENHMETAFILE
    wintypes.DWORD,  # nSize : DWORD
    ctypes.c_void_p,  # lpEnhMetaHeader : ENHMETAHEADER* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetEnhMetaFileHeader = Fiddle::Function.new(
  lib['GetEnhMetaFileHeader'],
  [
    Fiddle::TYPE_VOIDP,  # hemf : HENHMETAFILE
    -Fiddle::TYPE_INT,  # nSize : DWORD
    Fiddle::TYPE_VOIDP,  # lpEnhMetaHeader : ENHMETAHEADER* optional, out
  ],
  -Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("GDI32.dll")]
public static extern uint GetEnhMetaFileHeader(IntPtr hemf, uint nSize, IntPtr lpEnhMetaHeader);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetEnhMetaFileHeader' -Namespace Win32 -PassThru
# $api::GetEnhMetaFileHeader(hemf, nSize, lpEnhMetaHeader)

#uselib "GDI32.dll"
#func global GetEnhMetaFileHeader "GetEnhMetaFileHeader" sptr, sptr, sptr
; GetEnhMetaFileHeader hemf, nSize, varptr(lpEnhMetaHeader)   ; 戻り値は stat
; hemf : HENHMETAFILE -> "sptr"
; nSize : DWORD -> "sptr"
; lpEnhMetaHeader : ENHMETAHEADER* 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 GetEnhMetaFileHeader "GetEnhMetaFileHeader" sptr, int, var
; res = GetEnhMetaFileHeader(hemf, nSize, lpEnhMetaHeader)
; hemf : HENHMETAFILE -> "sptr"
; nSize : DWORD -> "int"
; lpEnhMetaHeader : ENHMETAHEADER* 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 GetEnhMetaFileHeader(HENHMETAFILE hemf, DWORD nSize, ENHMETAHEADER* lpEnhMetaHeader)
#uselib "GDI32.dll"
#cfunc global GetEnhMetaFileHeader "GetEnhMetaFileHeader" intptr, int, var
; res = GetEnhMetaFileHeader(hemf, nSize, lpEnhMetaHeader)
; hemf : HENHMETAFILE -> "intptr"
; nSize : DWORD -> "int"
; lpEnhMetaHeader : ENHMETAHEADER* 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")
	procGetEnhMetaFileHeader = gdi32.NewProc("GetEnhMetaFileHeader")
)

// hemf (HENHMETAFILE), nSize (DWORD), lpEnhMetaHeader (ENHMETAHEADER* optional, out)
r1, _, err := procGetEnhMetaFileHeader.Call(
	uintptr(hemf),
	uintptr(nSize),
	uintptr(lpEnhMetaHeader),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetEnhMetaFileHeader(
  hemf: THandle;   // HENHMETAFILE
  nSize: DWORD;   // DWORD
  lpEnhMetaHeader: Pointer   // ENHMETAHEADER* optional, out
): DWORD; stdcall;
  external 'GDI32.dll' name 'GetEnhMetaFileHeader';

result := DllCall("GDI32\GetEnhMetaFileHeader"
    , "Ptr", hemf   ; HENHMETAFILE
    , "UInt", nSize   ; DWORD
    , "Ptr", lpEnhMetaHeader   ; ENHMETAHEADER* optional, out
    , "UInt")   ; return: DWORD

●GetEnhMetaFileHeader(hemf, nSize, lpEnhMetaHeader) = DLL("GDI32.dll", "dword GetEnhMetaFileHeader(void*, dword, void*)")
# 呼び出し: GetEnhMetaFileHeader(hemf, nSize, lpEnhMetaHeader)
# hemf : HENHMETAFILE -> "void*"
# nSize : DWORD -> "dword"
# lpEnhMetaHeader : ENHMETAHEADER* 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)。