GetEnhMetaFileDescriptionW

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

DWORD GetEnhMetaFileDescriptionW(
    HENHMETAFILE hemf,
    DWORD cchBuffer,
    LPWSTR lpDescription   // optional
);

<DllImport("GDI32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetEnhMetaFileDescriptionW(
    hemf As IntPtr,   ' HENHMETAFILE
    cchBuffer As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpDescription As System.Text.StringBuilder   ' LPWSTR optional, out
) As UInteger
End Function

' hemf : HENHMETAFILE
' cchBuffer : DWORD
' lpDescription : LPWSTR optional, out
Declare PtrSafe Function GetEnhMetaFileDescriptionW Lib "gdi32" ( _
    ByVal hemf As LongPtr, _
    ByVal cchBuffer As Long, _
    ByVal lpDescription As LongPtr) As Long
' 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

GetEnhMetaFileDescriptionW = ctypes.windll.gdi32.GetEnhMetaFileDescriptionW
GetEnhMetaFileDescriptionW.restype = wintypes.DWORD
GetEnhMetaFileDescriptionW.argtypes = [
    wintypes.HANDLE,  # hemf : HENHMETAFILE
    wintypes.DWORD,  # cchBuffer : DWORD
    wintypes.LPWSTR,  # lpDescription : LPWSTR optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetEnhMetaFileDescriptionW = Fiddle::Function.new(
  lib['GetEnhMetaFileDescriptionW'],
  [
    Fiddle::TYPE_VOIDP,  # hemf : HENHMETAFILE
    -Fiddle::TYPE_INT,  # cchBuffer : DWORD
    Fiddle::TYPE_VOIDP,  # lpDescription : LPWSTR optional, out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "gdi32")]
extern "system" {
    fn GetEnhMetaFileDescriptionW(
        hemf: *mut core::ffi::c_void,  // HENHMETAFILE
        cchBuffer: u32,  // DWORD
        lpDescription: *mut u16  // LPWSTR optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll", CharSet = CharSet.Unicode)]
public static extern uint GetEnhMetaFileDescriptionW(IntPtr hemf, uint cchBuffer, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpDescription);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetEnhMetaFileDescriptionW' -Namespace Win32 -PassThru
# $api::GetEnhMetaFileDescriptionW(hemf, cchBuffer, lpDescription)

#uselib "GDI32.dll"
#func global GetEnhMetaFileDescriptionW "GetEnhMetaFileDescriptionW" wptr, wptr, wptr
; GetEnhMetaFileDescriptionW hemf, cchBuffer, varptr(lpDescription)   ; 戻り値は stat
; hemf : HENHMETAFILE -> "wptr"
; cchBuffer : DWORD -> "wptr"
; lpDescription : LPWSTR optional, out -> "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 GetEnhMetaFileDescriptionW "GetEnhMetaFileDescriptionW" sptr, int, var
; res = GetEnhMetaFileDescriptionW(hemf, cchBuffer, lpDescription)
; hemf : HENHMETAFILE -> "sptr"
; cchBuffer : DWORD -> "int"
; lpDescription : LPWSTR 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 GetEnhMetaFileDescriptionW(HENHMETAFILE hemf, DWORD cchBuffer, LPWSTR lpDescription)
#uselib "GDI32.dll"
#cfunc global GetEnhMetaFileDescriptionW "GetEnhMetaFileDescriptionW" intptr, int, var
; res = GetEnhMetaFileDescriptionW(hemf, cchBuffer, lpDescription)
; hemf : HENHMETAFILE -> "intptr"
; cchBuffer : DWORD -> "int"
; lpDescription : LPWSTR 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")
	procGetEnhMetaFileDescriptionW = gdi32.NewProc("GetEnhMetaFileDescriptionW")
)

// hemf (HENHMETAFILE), cchBuffer (DWORD), lpDescription (LPWSTR optional, out)
r1, _, err := procGetEnhMetaFileDescriptionW.Call(
	uintptr(hemf),
	uintptr(cchBuffer),
	uintptr(lpDescription),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetEnhMetaFileDescriptionW(
  hemf: THandle;   // HENHMETAFILE
  cchBuffer: DWORD;   // DWORD
  lpDescription: PWideChar   // LPWSTR optional, out
): DWORD; stdcall;
  external 'GDI32.dll' name 'GetEnhMetaFileDescriptionW';

result := DllCall("GDI32\GetEnhMetaFileDescriptionW"
    , "Ptr", hemf   ; HENHMETAFILE
    , "UInt", cchBuffer   ; DWORD
    , "Ptr", lpDescription   ; LPWSTR optional, out
    , "UInt")   ; return: DWORD

●GetEnhMetaFileDescriptionW(hemf, cchBuffer, lpDescription) = DLL("GDI32.dll", "dword GetEnhMetaFileDescriptionW(void*, dword, char*)")
# 呼び出し: GetEnhMetaFileDescriptionW(hemf, cchBuffer, lpDescription)
# hemf : HENHMETAFILE -> "void*"
# cchBuffer : DWORD -> "dword"
# lpDescription : LPWSTR optional, out -> "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。