SHCreateFileExtractIconW

// SHELL32.dll  (Unicode / -W)
#include <windows.h>

HRESULT SHCreateFileExtractIconW(
    LPCWSTR pszFile,
    DWORD dwFileAttributes,
    const GUID* riid,
    void** ppv
);

<DllImport("SHELL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SHCreateFileExtractIconW(
    <MarshalAs(UnmanagedType.LPWStr)> pszFile As String,   ' LPCWSTR
    dwFileAttributes As UInteger,   ' DWORD
    ByRef riid As Guid,   ' GUID*
    ppv As IntPtr   ' void** out
) As Integer
End Function

' pszFile : LPCWSTR
' dwFileAttributes : DWORD
' riid : GUID*
' ppv : void** out
Declare PtrSafe Function SHCreateFileExtractIconW Lib "shell32" ( _
    ByVal pszFile As LongPtr, _
    ByVal dwFileAttributes As Long, _
    ByVal riid As LongPtr, _
    ByVal ppv As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SHCreateFileExtractIconW = ctypes.windll.shell32.SHCreateFileExtractIconW
SHCreateFileExtractIconW.restype = ctypes.c_int
SHCreateFileExtractIconW.argtypes = [
    wintypes.LPCWSTR,  # pszFile : LPCWSTR
    wintypes.DWORD,  # dwFileAttributes : DWORD
    ctypes.c_void_p,  # riid : GUID*
    ctypes.c_void_p,  # ppv : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
SHCreateFileExtractIconW = Fiddle::Function.new(
  lib['SHCreateFileExtractIconW'],
  [
    Fiddle::TYPE_VOIDP,  # pszFile : LPCWSTR
    -Fiddle::TYPE_INT,  # dwFileAttributes : DWORD
    Fiddle::TYPE_VOIDP,  # riid : GUID*
    Fiddle::TYPE_VOIDP,  # ppv : void** out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shell32")]
extern "system" {
    fn SHCreateFileExtractIconW(
        pszFile: *const u16,  // LPCWSTR
        dwFileAttributes: u32,  // DWORD
        riid: *const GUID,  // GUID*
        ppv: *mut *mut ()  // void** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll", CharSet = CharSet.Unicode)]
public static extern int SHCreateFileExtractIconW([MarshalAs(UnmanagedType.LPWStr)] string pszFile, uint dwFileAttributes, ref Guid riid, IntPtr ppv);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_SHCreateFileExtractIconW' -Namespace Win32 -PassThru
# $api::SHCreateFileExtractIconW(pszFile, dwFileAttributes, riid, ppv)

#uselib "SHELL32.dll"
#func global SHCreateFileExtractIconW "SHCreateFileExtractIconW" wptr, wptr, wptr, wptr
; SHCreateFileExtractIconW pszFile, dwFileAttributes, varptr(riid), ppv   ; 戻り値は stat
; pszFile : LPCWSTR -> "wptr"
; dwFileAttributes : DWORD -> "wptr"
; riid : GUID* -> "wptr"
; ppv : void** out -> "wptr"
; ※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 SHCreateFileExtractIconW "SHCreateFileExtractIconW" wstr, int, var, sptr
; res = SHCreateFileExtractIconW(pszFile, dwFileAttributes, riid, ppv)
; pszFile : LPCWSTR -> "wstr"
; dwFileAttributes : DWORD -> "int"
; 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 SHCreateFileExtractIconW(LPCWSTR pszFile, DWORD dwFileAttributes, GUID* riid, void** ppv)
#uselib "SHELL32.dll"
#cfunc global SHCreateFileExtractIconW "SHCreateFileExtractIconW" wstr, int, var, intptr
; res = SHCreateFileExtractIconW(pszFile, dwFileAttributes, riid, ppv)
; pszFile : LPCWSTR -> "wstr"
; dwFileAttributes : DWORD -> "int"
; 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")
	procSHCreateFileExtractIconW = shell32.NewProc("SHCreateFileExtractIconW")
)

// pszFile (LPCWSTR), dwFileAttributes (DWORD), riid (GUID*), ppv (void** out)
r1, _, err := procSHCreateFileExtractIconW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszFile))),
	uintptr(dwFileAttributes),
	uintptr(riid),
	uintptr(ppv),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SHCreateFileExtractIconW(
  pszFile: PWideChar;   // LPCWSTR
  dwFileAttributes: DWORD;   // DWORD
  riid: PGUID;   // GUID*
  ppv: Pointer   // void** out
): Integer; stdcall;
  external 'SHELL32.dll' name 'SHCreateFileExtractIconW';

result := DllCall("SHELL32\SHCreateFileExtractIconW"
    , "WStr", pszFile   ; LPCWSTR
    , "UInt", dwFileAttributes   ; DWORD
    , "Ptr", riid   ; GUID*
    , "Ptr", ppv   ; void** out
    , "Int")   ; return: HRESULT

●SHCreateFileExtractIconW(pszFile, dwFileAttributes, riid, ppv) = DLL("SHELL32.dll", "int SHCreateFileExtractIconW(char*, dword, void*, void*)")
# 呼び出し: SHCreateFileExtractIconW(pszFile, dwFileAttributes, riid, ppv)
# pszFile : LPCWSTR -> "char*"
# dwFileAttributes : DWORD -> "dword"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。