CreateEnhMetaFileW

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

HDC CreateEnhMetaFileW(
    HDC hdc,   // optional
    LPCWSTR lpFilename,   // optional
    const RECT* lprc,   // optional
    LPCWSTR lpDesc   // optional
);

<DllImport("GDI32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function CreateEnhMetaFileW(
    hdc As IntPtr,   ' HDC optional
    <MarshalAs(UnmanagedType.LPWStr)> lpFilename As String,   ' LPCWSTR optional
    lprc As IntPtr,   ' RECT* optional
    <MarshalAs(UnmanagedType.LPWStr)> lpDesc As String   ' LPCWSTR optional
) As IntPtr
End Function

' hdc : HDC optional
' lpFilename : LPCWSTR optional
' lprc : RECT* optional
' lpDesc : LPCWSTR optional
Declare PtrSafe Function CreateEnhMetaFileW Lib "gdi32" ( _
    ByVal hdc As LongPtr, _
    ByVal lpFilename As LongPtr, _
    ByVal lprc As LongPtr, _
    ByVal lpDesc 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

CreateEnhMetaFileW = ctypes.windll.gdi32.CreateEnhMetaFileW
CreateEnhMetaFileW.restype = ctypes.c_void_p
CreateEnhMetaFileW.argtypes = [
    wintypes.HANDLE,  # hdc : HDC optional
    wintypes.LPCWSTR,  # lpFilename : LPCWSTR optional
    ctypes.c_void_p,  # lprc : RECT* optional
    wintypes.LPCWSTR,  # lpDesc : LPCWSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
CreateEnhMetaFileW = Fiddle::Function.new(
  lib['CreateEnhMetaFileW'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC optional
    Fiddle::TYPE_VOIDP,  # lpFilename : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # lprc : RECT* optional
    Fiddle::TYPE_VOIDP,  # lpDesc : LPCWSTR optional
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "gdi32")]
extern "system" {
    fn CreateEnhMetaFileW(
        hdc: *mut core::ffi::c_void,  // HDC optional
        lpFilename: *const u16,  // LPCWSTR optional
        lprc: *const RECT,  // RECT* optional
        lpDesc: *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 CreateEnhMetaFileW(IntPtr hdc, [MarshalAs(UnmanagedType.LPWStr)] string lpFilename, IntPtr lprc, [MarshalAs(UnmanagedType.LPWStr)] string lpDesc);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_CreateEnhMetaFileW' -Namespace Win32 -PassThru
# $api::CreateEnhMetaFileW(hdc, lpFilename, lprc, lpDesc)

#uselib "GDI32.dll"
#func global CreateEnhMetaFileW "CreateEnhMetaFileW" wptr, wptr, wptr, wptr
; CreateEnhMetaFileW hdc, lpFilename, varptr(lprc), lpDesc   ; 戻り値は stat
; hdc : HDC optional -> "wptr"
; lpFilename : LPCWSTR optional -> "wptr"
; lprc : RECT* optional -> "wptr"
; lpDesc : 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 CreateEnhMetaFileW "CreateEnhMetaFileW" sptr, wstr, var, wstr
; res = CreateEnhMetaFileW(hdc, lpFilename, lprc, lpDesc)
; hdc : HDC optional -> "sptr"
; lpFilename : LPCWSTR optional -> "wstr"
; lprc : RECT* optional -> "var"
; lpDesc : LPCWSTR optional -> "wstr"
; ※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。

; HDC CreateEnhMetaFileW(HDC hdc, LPCWSTR lpFilename, RECT* lprc, LPCWSTR lpDesc)
#uselib "GDI32.dll"
#cfunc global CreateEnhMetaFileW "CreateEnhMetaFileW" intptr, wstr, var, wstr
; res = CreateEnhMetaFileW(hdc, lpFilename, lprc, lpDesc)
; hdc : HDC optional -> "intptr"
; lpFilename : LPCWSTR optional -> "wstr"
; lprc : RECT* optional -> "var"
; lpDesc : LPCWSTR optional -> "wstr"
; ※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")
	procCreateEnhMetaFileW = gdi32.NewProc("CreateEnhMetaFileW")
)

// hdc (HDC optional), lpFilename (LPCWSTR optional), lprc (RECT* optional), lpDesc (LPCWSTR optional)
r1, _, err := procCreateEnhMetaFileW.Call(
	uintptr(hdc),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpFilename))),
	uintptr(lprc),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpDesc))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HDC

function CreateEnhMetaFileW(
  hdc: THandle;   // HDC optional
  lpFilename: PWideChar;   // LPCWSTR optional
  lprc: Pointer;   // RECT* optional
  lpDesc: PWideChar   // LPCWSTR optional
): THandle; stdcall;
  external 'GDI32.dll' name 'CreateEnhMetaFileW';

result := DllCall("GDI32\CreateEnhMetaFileW"
    , "Ptr", hdc   ; HDC optional
    , "WStr", lpFilename   ; LPCWSTR optional
    , "Ptr", lprc   ; RECT* optional
    , "WStr", lpDesc   ; LPCWSTR optional
    , "Ptr")   ; return: HDC

●CreateEnhMetaFileW(hdc, lpFilename, lprc, lpDesc) = DLL("GDI32.dll", "void* CreateEnhMetaFileW(void*, char*, void*, char*)")
# 呼び出し: CreateEnhMetaFileW(hdc, lpFilename, lprc, lpDesc)
# hdc : HDC optional -> "void*"
# lpFilename : LPCWSTR optional -> "char*"
# lprc : RECT* optional -> "void*"
# lpDesc : 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。