SHAssocEnumHandlers

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

HRESULT SHAssocEnumHandlers(
    LPCWSTR pszExtra,
    ASSOC_FILTER afFilter,
    IEnumAssocHandlers** ppEnumHandler
);

<DllImport("SHELL32.dll", ExactSpelling:=True)>
Public Shared Function SHAssocEnumHandlers(
    <MarshalAs(UnmanagedType.LPWStr)> pszExtra As String,   ' LPCWSTR
    afFilter As Integer,   ' ASSOC_FILTER
    ppEnumHandler As IntPtr   ' IEnumAssocHandlers** out
) As Integer
End Function

' pszExtra : LPCWSTR
' afFilter : ASSOC_FILTER
' ppEnumHandler : IEnumAssocHandlers** out
Declare PtrSafe Function SHAssocEnumHandlers Lib "shell32" ( _
    ByVal pszExtra As LongPtr, _
    ByVal afFilter As Long, _
    ByVal ppEnumHandler 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

SHAssocEnumHandlers = ctypes.windll.shell32.SHAssocEnumHandlers
SHAssocEnumHandlers.restype = ctypes.c_int
SHAssocEnumHandlers.argtypes = [
    wintypes.LPCWSTR,  # pszExtra : LPCWSTR
    ctypes.c_int,  # afFilter : ASSOC_FILTER
    ctypes.c_void_p,  # ppEnumHandler : IEnumAssocHandlers** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
SHAssocEnumHandlers = Fiddle::Function.new(
  lib['SHAssocEnumHandlers'],
  [
    Fiddle::TYPE_VOIDP,  # pszExtra : LPCWSTR
    Fiddle::TYPE_INT,  # afFilter : ASSOC_FILTER
    Fiddle::TYPE_VOIDP,  # ppEnumHandler : IEnumAssocHandlers** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "shell32")]
extern "system" {
    fn SHAssocEnumHandlers(
        pszExtra: *const u16,  // LPCWSTR
        afFilter: i32,  // ASSOC_FILTER
        ppEnumHandler: *mut *mut core::ffi::c_void  // IEnumAssocHandlers** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll")]
public static extern int SHAssocEnumHandlers([MarshalAs(UnmanagedType.LPWStr)] string pszExtra, int afFilter, IntPtr ppEnumHandler);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_SHAssocEnumHandlers' -Namespace Win32 -PassThru
# $api::SHAssocEnumHandlers(pszExtra, afFilter, ppEnumHandler)

#uselib "SHELL32.dll"
#func global SHAssocEnumHandlers "SHAssocEnumHandlers" sptr, sptr, sptr
; SHAssocEnumHandlers pszExtra, afFilter, ppEnumHandler   ; 戻り値は stat
; pszExtra : LPCWSTR -> "sptr"
; afFilter : ASSOC_FILTER -> "sptr"
; ppEnumHandler : IEnumAssocHandlers** 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 SHAssocEnumHandlers "SHAssocEnumHandlers" wstr, int, sptr
; res = SHAssocEnumHandlers(pszExtra, afFilter, ppEnumHandler)
; pszExtra : LPCWSTR -> "wstr"
; afFilter : ASSOC_FILTER -> "int"
; ppEnumHandler : IEnumAssocHandlers** out -> "sptr"

; HRESULT SHAssocEnumHandlers(LPCWSTR pszExtra, ASSOC_FILTER afFilter, IEnumAssocHandlers** ppEnumHandler)
#uselib "SHELL32.dll"
#cfunc global SHAssocEnumHandlers "SHAssocEnumHandlers" wstr, int, intptr
; res = SHAssocEnumHandlers(pszExtra, afFilter, ppEnumHandler)
; pszExtra : LPCWSTR -> "wstr"
; afFilter : ASSOC_FILTER -> "int"
; ppEnumHandler : IEnumAssocHandlers** out -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procSHAssocEnumHandlers = shell32.NewProc("SHAssocEnumHandlers")
)

// pszExtra (LPCWSTR), afFilter (ASSOC_FILTER), ppEnumHandler (IEnumAssocHandlers** out)
r1, _, err := procSHAssocEnumHandlers.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszExtra))),
	uintptr(afFilter),
	uintptr(ppEnumHandler),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SHAssocEnumHandlers(
  pszExtra: PWideChar;   // LPCWSTR
  afFilter: Integer;   // ASSOC_FILTER
  ppEnumHandler: Pointer   // IEnumAssocHandlers** out
): Integer; stdcall;
  external 'SHELL32.dll' name 'SHAssocEnumHandlers';

result := DllCall("SHELL32\SHAssocEnumHandlers"
    , "WStr", pszExtra   ; LPCWSTR
    , "Int", afFilter   ; ASSOC_FILTER
    , "Ptr", ppEnumHandler   ; IEnumAssocHandlers** out
    , "Int")   ; return: HRESULT

●SHAssocEnumHandlers(pszExtra, afFilter, ppEnumHandler) = DLL("SHELL32.dll", "int SHAssocEnumHandlers(char*, int, void*)")
# 呼び出し: SHAssocEnumHandlers(pszExtra, afFilter, ppEnumHandler)
# pszExtra : LPCWSTR -> "char*"
# afFilter : ASSOC_FILTER -> "int"
# ppEnumHandler : IEnumAssocHandlers** 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)。