SHSetDefaultProperties

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

HRESULT SHSetDefaultProperties(
    HWND hwnd,   // optional
    IShellItem* psi,
    DWORD dwFileOpFlags,
    IFileOperationProgressSink* pfops   // optional
);

<DllImport("SHELL32.dll", ExactSpelling:=True)>
Public Shared Function SHSetDefaultProperties(
    hwnd As IntPtr,   ' HWND optional
    psi As IntPtr,   ' IShellItem*
    dwFileOpFlags As UInteger,   ' DWORD
    pfops As IntPtr   ' IFileOperationProgressSink* optional
) As Integer
End Function

' hwnd : HWND optional
' psi : IShellItem*
' dwFileOpFlags : DWORD
' pfops : IFileOperationProgressSink* optional
Declare PtrSafe Function SHSetDefaultProperties Lib "shell32" ( _
    ByVal hwnd As LongPtr, _
    ByVal psi As LongPtr, _
    ByVal dwFileOpFlags As Long, _
    ByVal pfops 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

SHSetDefaultProperties = ctypes.windll.shell32.SHSetDefaultProperties
SHSetDefaultProperties.restype = ctypes.c_int
SHSetDefaultProperties.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND optional
    ctypes.c_void_p,  # psi : IShellItem*
    wintypes.DWORD,  # dwFileOpFlags : DWORD
    ctypes.c_void_p,  # pfops : IFileOperationProgressSink* optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
SHSetDefaultProperties = Fiddle::Function.new(
  lib['SHSetDefaultProperties'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND optional
    Fiddle::TYPE_VOIDP,  # psi : IShellItem*
    -Fiddle::TYPE_INT,  # dwFileOpFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pfops : IFileOperationProgressSink* optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "shell32")]
extern "system" {
    fn SHSetDefaultProperties(
        hwnd: *mut core::ffi::c_void,  // HWND optional
        psi: *mut core::ffi::c_void,  // IShellItem*
        dwFileOpFlags: u32,  // DWORD
        pfops: *mut core::ffi::c_void  // IFileOperationProgressSink* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll")]
public static extern int SHSetDefaultProperties(IntPtr hwnd, IntPtr psi, uint dwFileOpFlags, IntPtr pfops);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_SHSetDefaultProperties' -Namespace Win32 -PassThru
# $api::SHSetDefaultProperties(hwnd, psi, dwFileOpFlags, pfops)

#uselib "SHELL32.dll"
#func global SHSetDefaultProperties "SHSetDefaultProperties" sptr, sptr, sptr, sptr
; SHSetDefaultProperties hwnd, psi, dwFileOpFlags, pfops   ; 戻り値は stat
; hwnd : HWND optional -> "sptr"
; psi : IShellItem* -> "sptr"
; dwFileOpFlags : DWORD -> "sptr"
; pfops : IFileOperationProgressSink* optional -> "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 SHSetDefaultProperties "SHSetDefaultProperties" sptr, sptr, int, sptr
; res = SHSetDefaultProperties(hwnd, psi, dwFileOpFlags, pfops)
; hwnd : HWND optional -> "sptr"
; psi : IShellItem* -> "sptr"
; dwFileOpFlags : DWORD -> "int"
; pfops : IFileOperationProgressSink* optional -> "sptr"

; HRESULT SHSetDefaultProperties(HWND hwnd, IShellItem* psi, DWORD dwFileOpFlags, IFileOperationProgressSink* pfops)
#uselib "SHELL32.dll"
#cfunc global SHSetDefaultProperties "SHSetDefaultProperties" intptr, intptr, int, intptr
; res = SHSetDefaultProperties(hwnd, psi, dwFileOpFlags, pfops)
; hwnd : HWND optional -> "intptr"
; psi : IShellItem* -> "intptr"
; dwFileOpFlags : DWORD -> "int"
; pfops : IFileOperationProgressSink* optional -> "intptr"

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

var (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procSHSetDefaultProperties = shell32.NewProc("SHSetDefaultProperties")
)

// hwnd (HWND optional), psi (IShellItem*), dwFileOpFlags (DWORD), pfops (IFileOperationProgressSink* optional)
r1, _, err := procSHSetDefaultProperties.Call(
	uintptr(hwnd),
	uintptr(psi),
	uintptr(dwFileOpFlags),
	uintptr(pfops),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SHSetDefaultProperties(
  hwnd: THandle;   // HWND optional
  psi: Pointer;   // IShellItem*
  dwFileOpFlags: DWORD;   // DWORD
  pfops: Pointer   // IFileOperationProgressSink* optional
): Integer; stdcall;
  external 'SHELL32.dll' name 'SHSetDefaultProperties';

result := DllCall("SHELL32\SHSetDefaultProperties"
    , "Ptr", hwnd   ; HWND optional
    , "Ptr", psi   ; IShellItem*
    , "UInt", dwFileOpFlags   ; DWORD
    , "Ptr", pfops   ; IFileOperationProgressSink* optional
    , "Int")   ; return: HRESULT

●SHSetDefaultProperties(hwnd, psi, dwFileOpFlags, pfops) = DLL("SHELL32.dll", "int SHSetDefaultProperties(void*, void*, dword, void*)")
# 呼び出し: SHSetDefaultProperties(hwnd, psi, dwFileOpFlags, pfops)
# hwnd : HWND optional -> "void*"
# psi : IShellItem* -> "void*"
# dwFileOpFlags : DWORD -> "dword"
# pfops : IFileOperationProgressSink* optional -> "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)。