SHGetKnownFolderItem

// SHELL32.dll
#include <windows.h>

HRESULT SHGetKnownFolderItem(
    const GUID* rfid,
    KNOWN_FOLDER_FLAG flags,
    HANDLE hToken,   // optional
    const GUID* riid,
    void** ppv
);

<DllImport("SHELL32.dll", ExactSpelling:=True)>
Public Shared Function SHGetKnownFolderItem(
    ByRef rfid As Guid,   ' GUID*
    flags As Integer,   ' KNOWN_FOLDER_FLAG
    hToken As IntPtr,   ' HANDLE optional
    ByRef riid As Guid,   ' GUID*
    ppv As IntPtr   ' void** out
) As Integer
End Function

' rfid : GUID*
' flags : KNOWN_FOLDER_FLAG
' hToken : HANDLE optional
' riid : GUID*
' ppv : void** out
Declare PtrSafe Function SHGetKnownFolderItem Lib "shell32" ( _
    ByVal rfid As LongPtr, _
    ByVal flags As Long, _
    ByVal hToken As LongPtr, _
    ByVal riid As LongPtr, _
    ByVal ppv 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

SHGetKnownFolderItem = ctypes.windll.shell32.SHGetKnownFolderItem
SHGetKnownFolderItem.restype = ctypes.c_int
SHGetKnownFolderItem.argtypes = [
    ctypes.c_void_p,  # rfid : GUID*
    ctypes.c_int,  # flags : KNOWN_FOLDER_FLAG
    wintypes.HANDLE,  # hToken : HANDLE optional
    ctypes.c_void_p,  # riid : GUID*
    ctypes.c_void_p,  # ppv : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
SHGetKnownFolderItem = Fiddle::Function.new(
  lib['SHGetKnownFolderItem'],
  [
    Fiddle::TYPE_VOIDP,  # rfid : GUID*
    Fiddle::TYPE_INT,  # flags : KNOWN_FOLDER_FLAG
    Fiddle::TYPE_VOIDP,  # hToken : HANDLE optional
    Fiddle::TYPE_VOIDP,  # riid : GUID*
    Fiddle::TYPE_VOIDP,  # ppv : void** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "shell32")]
extern "system" {
    fn SHGetKnownFolderItem(
        rfid: *const GUID,  // GUID*
        flags: i32,  // KNOWN_FOLDER_FLAG
        hToken: *mut core::ffi::c_void,  // HANDLE optional
        riid: *const GUID,  // GUID*
        ppv: *mut *mut ()  // void** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll")]
public static extern int SHGetKnownFolderItem(ref Guid rfid, int flags, IntPtr hToken, ref Guid riid, IntPtr ppv);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_SHGetKnownFolderItem' -Namespace Win32 -PassThru
# $api::SHGetKnownFolderItem(rfid, flags, hToken, riid, ppv)

#uselib "SHELL32.dll"
#func global SHGetKnownFolderItem "SHGetKnownFolderItem" sptr, sptr, sptr, sptr, sptr
; SHGetKnownFolderItem varptr(rfid), flags, hToken, varptr(riid), ppv   ; 戻り値は stat
; rfid : GUID* -> "sptr"
; flags : KNOWN_FOLDER_FLAG -> "sptr"
; hToken : HANDLE optional -> "sptr"
; riid : GUID* -> "sptr"
; ppv : void** 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 "SHELL32.dll"
#cfunc global SHGetKnownFolderItem "SHGetKnownFolderItem" var, int, sptr, var, sptr
; res = SHGetKnownFolderItem(rfid, flags, hToken, riid, ppv)
; rfid : GUID* -> "var"
; flags : KNOWN_FOLDER_FLAG -> "int"
; hToken : HANDLE optional -> "sptr"
; riid : GUID* -> "var"
; ppv : void** out -> "sptr"
; ※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 SHGetKnownFolderItem(GUID* rfid, KNOWN_FOLDER_FLAG flags, HANDLE hToken, GUID* riid, void** ppv)
#uselib "SHELL32.dll"
#cfunc global SHGetKnownFolderItem "SHGetKnownFolderItem" var, int, intptr, var, intptr
; res = SHGetKnownFolderItem(rfid, flags, hToken, riid, ppv)
; rfid : GUID* -> "var"
; flags : KNOWN_FOLDER_FLAG -> "int"
; hToken : HANDLE optional -> "intptr"
; riid : GUID* -> "var"
; ppv : void** out -> "intptr"
; ※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 (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procSHGetKnownFolderItem = shell32.NewProc("SHGetKnownFolderItem")
)

// rfid (GUID*), flags (KNOWN_FOLDER_FLAG), hToken (HANDLE optional), riid (GUID*), ppv (void** out)
r1, _, err := procSHGetKnownFolderItem.Call(
	uintptr(rfid),
	uintptr(flags),
	uintptr(hToken),
	uintptr(riid),
	uintptr(ppv),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SHGetKnownFolderItem(
  rfid: PGUID;   // GUID*
  flags: Integer;   // KNOWN_FOLDER_FLAG
  hToken: THandle;   // HANDLE optional
  riid: PGUID;   // GUID*
  ppv: Pointer   // void** out
): Integer; stdcall;
  external 'SHELL32.dll' name 'SHGetKnownFolderItem';

result := DllCall("SHELL32\SHGetKnownFolderItem"
    , "Ptr", rfid   ; GUID*
    , "Int", flags   ; KNOWN_FOLDER_FLAG
    , "Ptr", hToken   ; HANDLE optional
    , "Ptr", riid   ; GUID*
    , "Ptr", ppv   ; void** out
    , "Int")   ; return: HRESULT

●SHGetKnownFolderItem(rfid, flags, hToken, riid, ppv) = DLL("SHELL32.dll", "int SHGetKnownFolderItem(void*, int, void*, void*, void*)")
# 呼び出し: SHGetKnownFolderItem(rfid, flags, hToken, riid, ppv)
# rfid : GUID* -> "void*"
# flags : KNOWN_FOLDER_FLAG -> "int"
# hToken : HANDLE optional -> "void*"
# riid : GUID* -> "void*"
# ppv : void** 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)。