GetEnhMetaFileDescriptionA

// GDI32.dll  (ANSI / -A)
#include <windows.h>

DWORD GetEnhMetaFileDescriptionA(
    HENHMETAFILE hemf,
    DWORD cchBuffer,
    LPSTR lpDescription   // optional
);

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

' hemf : HENHMETAFILE
' cchBuffer : DWORD
' lpDescription : LPSTR optional, out
Declare PtrSafe Function GetEnhMetaFileDescriptionA Lib "gdi32" ( _
    ByVal hemf As LongPtr, _
    ByVal cchBuffer As Long, _
    ByVal lpDescription As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetEnhMetaFileDescriptionA = Fiddle::Function.new(
  lib['GetEnhMetaFileDescriptionA'],
  [
    Fiddle::TYPE_VOIDP,  # hemf : HENHMETAFILE
    -Fiddle::TYPE_INT,  # cchBuffer : DWORD
    Fiddle::TYPE_VOIDP,  # lpDescription : LPSTR optional, out
  ],
  -Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("GDI32.dll", CharSet = CharSet.Ansi)]
public static extern uint GetEnhMetaFileDescriptionA(IntPtr hemf, uint cchBuffer, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpDescription);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetEnhMetaFileDescriptionA' -Namespace Win32 -PassThru
# $api::GetEnhMetaFileDescriptionA(hemf, cchBuffer, lpDescription)

#uselib "GDI32.dll"
#func global GetEnhMetaFileDescriptionA "GetEnhMetaFileDescriptionA" sptr, sptr, sptr
; GetEnhMetaFileDescriptionA hemf, cchBuffer, varptr(lpDescription)   ; 戻り値は stat
; hemf : HENHMETAFILE -> "sptr"
; cchBuffer : DWORD -> "sptr"
; lpDescription : LPSTR 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 GetEnhMetaFileDescriptionA "GetEnhMetaFileDescriptionA" sptr, int, var
; res = GetEnhMetaFileDescriptionA(hemf, cchBuffer, lpDescription)
; hemf : HENHMETAFILE -> "sptr"
; cchBuffer : DWORD -> "int"
; lpDescription : LPSTR 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 GetEnhMetaFileDescriptionA(HENHMETAFILE hemf, DWORD cchBuffer, LPSTR lpDescription)
#uselib "GDI32.dll"
#cfunc global GetEnhMetaFileDescriptionA "GetEnhMetaFileDescriptionA" intptr, int, var
; res = GetEnhMetaFileDescriptionA(hemf, cchBuffer, lpDescription)
; hemf : HENHMETAFILE -> "intptr"
; cchBuffer : DWORD -> "int"
; lpDescription : LPSTR 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")
	procGetEnhMetaFileDescriptionA = gdi32.NewProc("GetEnhMetaFileDescriptionA")
)

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

function GetEnhMetaFileDescriptionA(
  hemf: THandle;   // HENHMETAFILE
  cchBuffer: DWORD;   // DWORD
  lpDescription: PAnsiChar   // LPSTR optional, out
): DWORD; stdcall;
  external 'GDI32.dll' name 'GetEnhMetaFileDescriptionA';

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

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