OpenRegStream

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

IStream* OpenRegStream(
    HKEY hkey,
    LPCWSTR pszSubkey,   // optional
    LPCWSTR pszValue,   // optional
    DWORD grfMode
);

<DllImport("SHELL32.dll", ExactSpelling:=True)>
Public Shared Function OpenRegStream(
    hkey As IntPtr,   ' HKEY
    <MarshalAs(UnmanagedType.LPWStr)> pszSubkey As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pszValue As String,   ' LPCWSTR optional
    grfMode As UInteger   ' DWORD
) As IntPtr
End Function

' hkey : HKEY
' pszSubkey : LPCWSTR optional
' pszValue : LPCWSTR optional
' grfMode : DWORD
Declare PtrSafe Function OpenRegStream Lib "shell32" ( _
    ByVal hkey As LongPtr, _
    ByVal pszSubkey As LongPtr, _
    ByVal pszValue As LongPtr, _
    ByVal grfMode As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

OpenRegStream = ctypes.windll.shell32.OpenRegStream
OpenRegStream.restype = ctypes.c_void_p
OpenRegStream.argtypes = [
    wintypes.HANDLE,  # hkey : HKEY
    wintypes.LPCWSTR,  # pszSubkey : LPCWSTR optional
    wintypes.LPCWSTR,  # pszValue : LPCWSTR optional
    wintypes.DWORD,  # grfMode : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
OpenRegStream = Fiddle::Function.new(
  lib['OpenRegStream'],
  [
    Fiddle::TYPE_VOIDP,  # hkey : HKEY
    Fiddle::TYPE_VOIDP,  # pszSubkey : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pszValue : LPCWSTR optional
    -Fiddle::TYPE_INT,  # grfMode : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "shell32")]
extern "system" {
    fn OpenRegStream(
        hkey: *mut core::ffi::c_void,  // HKEY
        pszSubkey: *const u16,  // LPCWSTR optional
        pszValue: *const u16,  // LPCWSTR optional
        grfMode: u32  // DWORD
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll")]
public static extern IntPtr OpenRegStream(IntPtr hkey, [MarshalAs(UnmanagedType.LPWStr)] string pszSubkey, [MarshalAs(UnmanagedType.LPWStr)] string pszValue, uint grfMode);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_OpenRegStream' -Namespace Win32 -PassThru
# $api::OpenRegStream(hkey, pszSubkey, pszValue, grfMode)

#uselib "SHELL32.dll"
#func global OpenRegStream "OpenRegStream" sptr, sptr, sptr, sptr
; OpenRegStream hkey, pszSubkey, pszValue, grfMode   ; 戻り値は stat
; hkey : HKEY -> "sptr"
; pszSubkey : LPCWSTR optional -> "sptr"
; pszValue : LPCWSTR optional -> "sptr"
; grfMode : DWORD -> "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 OpenRegStream "OpenRegStream" sptr, wstr, wstr, int
; res = OpenRegStream(hkey, pszSubkey, pszValue, grfMode)
; hkey : HKEY -> "sptr"
; pszSubkey : LPCWSTR optional -> "wstr"
; pszValue : LPCWSTR optional -> "wstr"
; grfMode : DWORD -> "int"

; IStream* OpenRegStream(HKEY hkey, LPCWSTR pszSubkey, LPCWSTR pszValue, DWORD grfMode)
#uselib "SHELL32.dll"
#cfunc global OpenRegStream "OpenRegStream" intptr, wstr, wstr, int
; res = OpenRegStream(hkey, pszSubkey, pszValue, grfMode)
; hkey : HKEY -> "intptr"
; pszSubkey : LPCWSTR optional -> "wstr"
; pszValue : LPCWSTR optional -> "wstr"
; grfMode : DWORD -> "int"

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

var (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procOpenRegStream = shell32.NewProc("OpenRegStream")
)

// hkey (HKEY), pszSubkey (LPCWSTR optional), pszValue (LPCWSTR optional), grfMode (DWORD)
r1, _, err := procOpenRegStream.Call(
	uintptr(hkey),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszSubkey))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszValue))),
	uintptr(grfMode),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // IStream*

function OpenRegStream(
  hkey: THandle;   // HKEY
  pszSubkey: PWideChar;   // LPCWSTR optional
  pszValue: PWideChar;   // LPCWSTR optional
  grfMode: DWORD   // DWORD
): Pointer; stdcall;
  external 'SHELL32.dll' name 'OpenRegStream';

result := DllCall("SHELL32\OpenRegStream"
    , "Ptr", hkey   ; HKEY
    , "WStr", pszSubkey   ; LPCWSTR optional
    , "WStr", pszValue   ; LPCWSTR optional
    , "UInt", grfMode   ; DWORD
    , "Ptr")   ; return: IStream*

●OpenRegStream(hkey, pszSubkey, pszValue, grfMode) = DLL("SHELL32.dll", "void* OpenRegStream(void*, char*, char*, dword)")
# 呼び出し: OpenRegStream(hkey, pszSubkey, pszValue, grfMode)
# hkey : HKEY -> "void*"
# pszSubkey : LPCWSTR optional -> "char*"
# pszValue : LPCWSTR optional -> "char*"
# grfMode : DWORD -> "dword"
# 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)。