StringFromCLSID

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

HRESULT StringFromCLSID(
    const GUID* rclsid,
    LPWSTR* lplpsz
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function StringFromCLSID(
    ByRef rclsid As Guid,   ' GUID*
    lplpsz As IntPtr   ' LPWSTR* out
) As Integer
End Function

' rclsid : GUID*
' lplpsz : LPWSTR* out
Declare PtrSafe Function StringFromCLSID Lib "ole32" ( _
    ByVal rclsid As LongPtr, _
    ByVal lplpsz 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

StringFromCLSID = ctypes.windll.ole32.StringFromCLSID
StringFromCLSID.restype = ctypes.c_int
StringFromCLSID.argtypes = [
    ctypes.c_void_p,  # rclsid : GUID*
    ctypes.c_void_p,  # lplpsz : LPWSTR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
StringFromCLSID = Fiddle::Function.new(
  lib['StringFromCLSID'],
  [
    Fiddle::TYPE_VOIDP,  # rclsid : GUID*
    Fiddle::TYPE_VOIDP,  # lplpsz : LPWSTR* out
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("OLE32.dll")]
public static extern int StringFromCLSID(ref Guid rclsid, IntPtr lplpsz);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_StringFromCLSID' -Namespace Win32 -PassThru
# $api::StringFromCLSID(rclsid, lplpsz)

#uselib "OLE32.dll"
#func global StringFromCLSID "StringFromCLSID" sptr, sptr
; StringFromCLSID varptr(rclsid), varptr(lplpsz)   ; 戻り値は stat
; rclsid : GUID* -> "sptr"
; lplpsz : 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 StringFromCLSID "StringFromCLSID" var, var
; res = StringFromCLSID(rclsid, lplpsz)
; rclsid : GUID* -> "var"
; lplpsz : 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 StringFromCLSID(GUID* rclsid, LPWSTR* lplpsz)
#uselib "OLE32.dll"
#cfunc global StringFromCLSID "StringFromCLSID" var, var
; res = StringFromCLSID(rclsid, lplpsz)
; rclsid : GUID* -> "var"
; lplpsz : 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")
	procStringFromCLSID = ole32.NewProc("StringFromCLSID")
)

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

function StringFromCLSID(
  rclsid: PGUID;   // GUID*
  lplpsz: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'OLE32.dll' name 'StringFromCLSID';

result := DllCall("OLE32\StringFromCLSID"
    , "Ptr", rclsid   ; GUID*
    , "Ptr", lplpsz   ; LPWSTR* out
    , "Int")   ; return: HRESULT

●StringFromCLSID(rclsid, lplpsz) = DLL("OLE32.dll", "int StringFromCLSID(void*, void*)")
# 呼び出し: StringFromCLSID(rclsid, lplpsz)
# rclsid : GUID* -> "void*"
# lplpsz : LPWSTR* 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)。