OpenFileMappingW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

HANDLE OpenFileMappingW(
    DWORD dwDesiredAccess,
    BOOL bInheritHandle,
    LPCWSTR lpName
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function OpenFileMappingW(
    dwDesiredAccess As UInteger,   ' DWORD
    bInheritHandle As Boolean,   ' BOOL
    <MarshalAs(UnmanagedType.LPWStr)> lpName As String   ' LPCWSTR
) As IntPtr
End Function

' dwDesiredAccess : DWORD
' bInheritHandle : BOOL
' lpName : LPCWSTR
Declare PtrSafe Function OpenFileMappingW Lib "kernel32" ( _
    ByVal dwDesiredAccess As Long, _
    ByVal bInheritHandle As Long, _
    ByVal lpName As LongPtr) As LongPtr
' 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

OpenFileMappingW = ctypes.windll.kernel32.OpenFileMappingW
OpenFileMappingW.restype = ctypes.c_void_p
OpenFileMappingW.argtypes = [
    wintypes.DWORD,  # dwDesiredAccess : DWORD
    wintypes.BOOL,  # bInheritHandle : BOOL
    wintypes.LPCWSTR,  # lpName : LPCWSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
OpenFileMappingW = Fiddle::Function.new(
  lib['OpenFileMappingW'],
  [
    -Fiddle::TYPE_INT,  # dwDesiredAccess : DWORD
    Fiddle::TYPE_INT,  # bInheritHandle : BOOL
    Fiddle::TYPE_VOIDP,  # lpName : LPCWSTR
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn OpenFileMappingW(
        dwDesiredAccess: u32,  // DWORD
        bInheritHandle: i32,  // BOOL
        lpName: *const u16  // LPCWSTR
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr OpenFileMappingW(uint dwDesiredAccess, bool bInheritHandle, [MarshalAs(UnmanagedType.LPWStr)] string lpName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_OpenFileMappingW' -Namespace Win32 -PassThru
# $api::OpenFileMappingW(dwDesiredAccess, bInheritHandle, lpName)

#uselib "KERNEL32.dll"
#func global OpenFileMappingW "OpenFileMappingW" wptr, wptr, wptr
; OpenFileMappingW dwDesiredAccess, bInheritHandle, lpName   ; 戻り値は stat
; dwDesiredAccess : DWORD -> "wptr"
; bInheritHandle : BOOL -> "wptr"
; lpName : LPCWSTR -> "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 "KERNEL32.dll"
#cfunc global OpenFileMappingW "OpenFileMappingW" int, int, wstr
; res = OpenFileMappingW(dwDesiredAccess, bInheritHandle, lpName)
; dwDesiredAccess : DWORD -> "int"
; bInheritHandle : BOOL -> "int"
; lpName : LPCWSTR -> "wstr"

; HANDLE OpenFileMappingW(DWORD dwDesiredAccess, BOOL bInheritHandle, LPCWSTR lpName)
#uselib "KERNEL32.dll"
#cfunc global OpenFileMappingW "OpenFileMappingW" int, int, wstr
; res = OpenFileMappingW(dwDesiredAccess, bInheritHandle, lpName)
; dwDesiredAccess : DWORD -> "int"
; bInheritHandle : BOOL -> "int"
; lpName : LPCWSTR -> "wstr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procOpenFileMappingW = kernel32.NewProc("OpenFileMappingW")
)

// dwDesiredAccess (DWORD), bInheritHandle (BOOL), lpName (LPCWSTR)
r1, _, err := procOpenFileMappingW.Call(
	uintptr(dwDesiredAccess),
	uintptr(bInheritHandle),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HANDLE

function OpenFileMappingW(
  dwDesiredAccess: DWORD;   // DWORD
  bInheritHandle: BOOL;   // BOOL
  lpName: PWideChar   // LPCWSTR
): THandle; stdcall;
  external 'KERNEL32.dll' name 'OpenFileMappingW';

result := DllCall("KERNEL32\OpenFileMappingW"
    , "UInt", dwDesiredAccess   ; DWORD
    , "Int", bInheritHandle   ; BOOL
    , "WStr", lpName   ; LPCWSTR
    , "Ptr")   ; return: HANDLE

●OpenFileMappingW(dwDesiredAccess, bInheritHandle, lpName) = DLL("KERNEL32.dll", "void* OpenFileMappingW(dword, bool, char*)")
# 呼び出し: OpenFileMappingW(dwDesiredAccess, bInheritHandle, lpName)
# dwDesiredAccess : DWORD -> "dword"
# bInheritHandle : BOOL -> "bool"
# lpName : LPCWSTR -> "char*"
# 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。