FmtIdToPropStgName

// OLE32.dll
#include <windows.h>

HRESULT FmtIdToPropStgName(
    const GUID* pfmtid,
    LPWSTR oszName
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function FmtIdToPropStgName(
    ByRef pfmtid As Guid,   ' GUID*
    <MarshalAs(UnmanagedType.LPWStr)> oszName As System.Text.StringBuilder   ' LPWSTR out
) As Integer
End Function

' pfmtid : GUID*
' oszName : LPWSTR out
Declare PtrSafe Function FmtIdToPropStgName Lib "ole32" ( _
    ByVal pfmtid As LongPtr, _
    ByVal oszName 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

FmtIdToPropStgName = ctypes.windll.ole32.FmtIdToPropStgName
FmtIdToPropStgName.restype = ctypes.c_int
FmtIdToPropStgName.argtypes = [
    ctypes.c_void_p,  # pfmtid : GUID*
    wintypes.LPWSTR,  # oszName : LPWSTR out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
FmtIdToPropStgName = Fiddle::Function.new(
  lib['FmtIdToPropStgName'],
  [
    Fiddle::TYPE_VOIDP,  # pfmtid : GUID*
    Fiddle::TYPE_VOIDP,  # oszName : LPWSTR out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn FmtIdToPropStgName(
        pfmtid: *const GUID,  // GUID*
        oszName: *mut u16  // LPWSTR out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int FmtIdToPropStgName(ref Guid pfmtid, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder oszName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_FmtIdToPropStgName' -Namespace Win32 -PassThru
# $api::FmtIdToPropStgName(pfmtid, oszName)

#uselib "OLE32.dll"
#func global FmtIdToPropStgName "FmtIdToPropStgName" sptr, sptr
; FmtIdToPropStgName varptr(pfmtid), varptr(oszName)   ; 戻り値は stat
; pfmtid : GUID* -> "sptr"
; oszName : LPWSTR 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 "OLE32.dll"
#cfunc global FmtIdToPropStgName "FmtIdToPropStgName" var, var
; res = FmtIdToPropStgName(pfmtid, oszName)
; pfmtid : GUID* -> "var"
; oszName : LPWSTR 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。

; HRESULT FmtIdToPropStgName(GUID* pfmtid, LPWSTR oszName)
#uselib "OLE32.dll"
#cfunc global FmtIdToPropStgName "FmtIdToPropStgName" var, var
; res = FmtIdToPropStgName(pfmtid, oszName)
; pfmtid : GUID* -> "var"
; oszName : LPWSTR 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 (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procFmtIdToPropStgName = ole32.NewProc("FmtIdToPropStgName")
)

// pfmtid (GUID*), oszName (LPWSTR out)
r1, _, err := procFmtIdToPropStgName.Call(
	uintptr(pfmtid),
	uintptr(oszName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function FmtIdToPropStgName(
  pfmtid: PGUID;   // GUID*
  oszName: PWideChar   // LPWSTR out
): Integer; stdcall;
  external 'OLE32.dll' name 'FmtIdToPropStgName';

result := DllCall("OLE32\FmtIdToPropStgName"
    , "Ptr", pfmtid   ; GUID*
    , "Ptr", oszName   ; LPWSTR out
    , "Int")   ; return: HRESULT

●FmtIdToPropStgName(pfmtid, oszName) = DLL("OLE32.dll", "int FmtIdToPropStgName(void*, char*)")
# 呼び出し: FmtIdToPropStgName(pfmtid, oszName)
# pfmtid : GUID* -> "void*"
# oszName : LPWSTR 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)。