CopyEnhMetaFileW

// GDI32.dll  (Unicode / -W)
#include <windows.h>

HENHMETAFILE CopyEnhMetaFileW(
    HENHMETAFILE hEnh,
    LPCWSTR lpFileName   // optional
);

<DllImport("GDI32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function CopyEnhMetaFileW(
    hEnh As IntPtr,   ' HENHMETAFILE
    <MarshalAs(UnmanagedType.LPWStr)> lpFileName As String   ' LPCWSTR optional
) As IntPtr
End Function

' hEnh : HENHMETAFILE
' lpFileName : LPCWSTR optional
Declare PtrSafe Function CopyEnhMetaFileW Lib "gdi32" ( _
    ByVal hEnh As LongPtr, _
    ByVal lpFileName As LongPtr) As LongPtr
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CopyEnhMetaFileW = ctypes.windll.gdi32.CopyEnhMetaFileW
CopyEnhMetaFileW.restype = ctypes.c_void_p
CopyEnhMetaFileW.argtypes = [
    wintypes.HANDLE,  # hEnh : HENHMETAFILE
    wintypes.LPCWSTR,  # lpFileName : LPCWSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
CopyEnhMetaFileW = Fiddle::Function.new(
  lib['CopyEnhMetaFileW'],
  [
    Fiddle::TYPE_VOIDP,  # hEnh : HENHMETAFILE
    Fiddle::TYPE_VOIDP,  # lpFileName : LPCWSTR optional
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "gdi32")]
extern "system" {
    fn CopyEnhMetaFileW(
        hEnh: *mut core::ffi::c_void,  // HENHMETAFILE
        lpFileName: *const u16  // LPCWSTR optional
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr CopyEnhMetaFileW(IntPtr hEnh, [MarshalAs(UnmanagedType.LPWStr)] string lpFileName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_CopyEnhMetaFileW' -Namespace Win32 -PassThru
# $api::CopyEnhMetaFileW(hEnh, lpFileName)

#uselib "GDI32.dll"
#func global CopyEnhMetaFileW "CopyEnhMetaFileW" wptr, wptr
; CopyEnhMetaFileW hEnh, lpFileName   ; 戻り値は stat
; hEnh : HENHMETAFILE -> "wptr"
; lpFileName : LPCWSTR optional -> "wptr"
; ※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 CopyEnhMetaFileW "CopyEnhMetaFileW" sptr, wstr
; res = CopyEnhMetaFileW(hEnh, lpFileName)
; hEnh : HENHMETAFILE -> "sptr"
; lpFileName : LPCWSTR optional -> "wstr"

; HENHMETAFILE CopyEnhMetaFileW(HENHMETAFILE hEnh, LPCWSTR lpFileName)
#uselib "GDI32.dll"
#cfunc global CopyEnhMetaFileW "CopyEnhMetaFileW" intptr, wstr
; res = CopyEnhMetaFileW(hEnh, lpFileName)
; hEnh : HENHMETAFILE -> "intptr"
; lpFileName : LPCWSTR optional -> "wstr"

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

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procCopyEnhMetaFileW = gdi32.NewProc("CopyEnhMetaFileW")
)

// hEnh (HENHMETAFILE), lpFileName (LPCWSTR optional)
r1, _, err := procCopyEnhMetaFileW.Call(
	uintptr(hEnh),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpFileName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HENHMETAFILE

function CopyEnhMetaFileW(
  hEnh: THandle;   // HENHMETAFILE
  lpFileName: PWideChar   // LPCWSTR optional
): THandle; stdcall;
  external 'GDI32.dll' name 'CopyEnhMetaFileW';

result := DllCall("GDI32\CopyEnhMetaFileW"
    , "Ptr", hEnh   ; HENHMETAFILE
    , "WStr", lpFileName   ; LPCWSTR optional
    , "Ptr")   ; return: HENHMETAFILE

●CopyEnhMetaFileW(hEnh, lpFileName) = DLL("GDI32.dll", "void* CopyEnhMetaFileW(void*, char*)")
# 呼び出し: CopyEnhMetaFileW(hEnh, lpFileName)
# hEnh : HENHMETAFILE -> "void*"
# lpFileName : LPCWSTR optional -> "char*"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。