GetEnhMetaFileBits

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

DWORD GetEnhMetaFileBits(
    HENHMETAFILE hEMF,
    DWORD nSize,
    BYTE* lpData   // optional
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function GetEnhMetaFileBits(
    hEMF As IntPtr,   ' HENHMETAFILE
    nSize As UInteger,   ' DWORD
    lpData As IntPtr   ' BYTE* optional, out
) As UInteger
End Function

' hEMF : HENHMETAFILE
' nSize : DWORD
' lpData : BYTE* optional, out
Declare PtrSafe Function GetEnhMetaFileBits Lib "gdi32" ( _
    ByVal hEMF As LongPtr, _
    ByVal nSize As Long, _
    ByVal lpData 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

GetEnhMetaFileBits = ctypes.windll.gdi32.GetEnhMetaFileBits
GetEnhMetaFileBits.restype = wintypes.DWORD
GetEnhMetaFileBits.argtypes = [
    wintypes.HANDLE,  # hEMF : HENHMETAFILE
    wintypes.DWORD,  # nSize : DWORD
    ctypes.POINTER(ctypes.c_ubyte),  # lpData : BYTE* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetEnhMetaFileBits = Fiddle::Function.new(
  lib['GetEnhMetaFileBits'],
  [
    Fiddle::TYPE_VOIDP,  # hEMF : HENHMETAFILE
    -Fiddle::TYPE_INT,  # nSize : DWORD
    Fiddle::TYPE_VOIDP,  # lpData : BYTE* optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn GetEnhMetaFileBits(
        hEMF: *mut core::ffi::c_void,  // HENHMETAFILE
        nSize: u32,  // DWORD
        lpData: *mut u8  // BYTE* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll")]
public static extern uint GetEnhMetaFileBits(IntPtr hEMF, uint nSize, IntPtr lpData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetEnhMetaFileBits' -Namespace Win32 -PassThru
# $api::GetEnhMetaFileBits(hEMF, nSize, lpData)

#uselib "GDI32.dll"
#func global GetEnhMetaFileBits "GetEnhMetaFileBits" sptr, sptr, sptr
; GetEnhMetaFileBits hEMF, nSize, varptr(lpData)   ; 戻り値は stat
; hEMF : HENHMETAFILE -> "sptr"
; nSize : DWORD -> "sptr"
; lpData : BYTE* 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 GetEnhMetaFileBits "GetEnhMetaFileBits" sptr, int, var
; res = GetEnhMetaFileBits(hEMF, nSize, lpData)
; hEMF : HENHMETAFILE -> "sptr"
; nSize : DWORD -> "int"
; lpData : BYTE* 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 GetEnhMetaFileBits(HENHMETAFILE hEMF, DWORD nSize, BYTE* lpData)
#uselib "GDI32.dll"
#cfunc global GetEnhMetaFileBits "GetEnhMetaFileBits" intptr, int, var
; res = GetEnhMetaFileBits(hEMF, nSize, lpData)
; hEMF : HENHMETAFILE -> "intptr"
; nSize : DWORD -> "int"
; lpData : BYTE* 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")
	procGetEnhMetaFileBits = gdi32.NewProc("GetEnhMetaFileBits")
)

// hEMF (HENHMETAFILE), nSize (DWORD), lpData (BYTE* optional, out)
r1, _, err := procGetEnhMetaFileBits.Call(
	uintptr(hEMF),
	uintptr(nSize),
	uintptr(lpData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetEnhMetaFileBits(
  hEMF: THandle;   // HENHMETAFILE
  nSize: DWORD;   // DWORD
  lpData: Pointer   // BYTE* optional, out
): DWORD; stdcall;
  external 'GDI32.dll' name 'GetEnhMetaFileBits';

result := DllCall("GDI32\GetEnhMetaFileBits"
    , "Ptr", hEMF   ; HENHMETAFILE
    , "UInt", nSize   ; DWORD
    , "Ptr", lpData   ; BYTE* optional, out
    , "UInt")   ; return: DWORD

●GetEnhMetaFileBits(hEMF, nSize, lpData) = DLL("GDI32.dll", "dword GetEnhMetaFileBits(void*, dword, void*)")
# 呼び出し: GetEnhMetaFileBits(hEMF, nSize, lpData)
# hEMF : HENHMETAFILE -> "void*"
# nSize : DWORD -> "dword"
# lpData : BYTE* 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)。