InitOnceExecuteOnce

// KERNEL32.dll
#include <windows.h>

BOOL InitOnceExecuteOnce(
    INIT_ONCE* InitOnce,
    PINIT_ONCE_FN InitFn,
    void* Parameter,   // optional
    void** Context   // optional
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InitOnceExecuteOnce(
    InitOnce As IntPtr,   ' INIT_ONCE* in/out
    InitFn As IntPtr,   ' PINIT_ONCE_FN
    Parameter As IntPtr,   ' void* optional, in/out
    Context As IntPtr   ' void** optional, out
) As Boolean
End Function

' InitOnce : INIT_ONCE* in/out
' InitFn : PINIT_ONCE_FN
' Parameter : void* optional, in/out
' Context : void** optional, out
Declare PtrSafe Function InitOnceExecuteOnce Lib "kernel32" ( _
    ByVal InitOnce As LongPtr, _
    ByVal InitFn As LongPtr, _
    ByVal Parameter As LongPtr, _
    ByVal Context 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

InitOnceExecuteOnce = ctypes.windll.kernel32.InitOnceExecuteOnce
InitOnceExecuteOnce.restype = wintypes.BOOL
InitOnceExecuteOnce.argtypes = [
    ctypes.c_void_p,  # InitOnce : INIT_ONCE* in/out
    ctypes.c_void_p,  # InitFn : PINIT_ONCE_FN
    ctypes.POINTER(None),  # Parameter : void* optional, in/out
    ctypes.c_void_p,  # Context : void** optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
InitOnceExecuteOnce = Fiddle::Function.new(
  lib['InitOnceExecuteOnce'],
  [
    Fiddle::TYPE_VOIDP,  # InitOnce : INIT_ONCE* in/out
    Fiddle::TYPE_VOIDP,  # InitFn : PINIT_ONCE_FN
    Fiddle::TYPE_VOIDP,  # Parameter : void* optional, in/out
    Fiddle::TYPE_VOIDP,  # Context : void** optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn InitOnceExecuteOnce(
        InitOnce: *mut INIT_ONCE,  // INIT_ONCE* in/out
        InitFn: *const core::ffi::c_void,  // PINIT_ONCE_FN
        Parameter: *mut (),  // void* optional, in/out
        Context: *mut *mut ()  // void** optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool InitOnceExecuteOnce(IntPtr InitOnce, IntPtr InitFn, IntPtr Parameter, IntPtr Context);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_InitOnceExecuteOnce' -Namespace Win32 -PassThru
# $api::InitOnceExecuteOnce(InitOnce, InitFn, Parameter, Context)

#uselib "KERNEL32.dll"
#func global InitOnceExecuteOnce "InitOnceExecuteOnce" sptr, sptr, sptr, sptr
; InitOnceExecuteOnce varptr(InitOnce), InitFn, Parameter, Context   ; 戻り値は stat
; InitOnce : INIT_ONCE* in/out -> "sptr"
; InitFn : PINIT_ONCE_FN -> "sptr"
; Parameter : void* optional, in/out -> "sptr"
; Context : void** optional, 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 "KERNEL32.dll"
#cfunc global InitOnceExecuteOnce "InitOnceExecuteOnce" var, sptr, sptr, sptr
; res = InitOnceExecuteOnce(InitOnce, InitFn, Parameter, Context)
; InitOnce : INIT_ONCE* in/out -> "var"
; InitFn : PINIT_ONCE_FN -> "sptr"
; Parameter : void* optional, in/out -> "sptr"
; Context : void** optional, 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。

; BOOL InitOnceExecuteOnce(INIT_ONCE* InitOnce, PINIT_ONCE_FN InitFn, void* Parameter, void** Context)
#uselib "KERNEL32.dll"
#cfunc global InitOnceExecuteOnce "InitOnceExecuteOnce" var, intptr, intptr, intptr
; res = InitOnceExecuteOnce(InitOnce, InitFn, Parameter, Context)
; InitOnce : INIT_ONCE* in/out -> "var"
; InitFn : PINIT_ONCE_FN -> "intptr"
; Parameter : void* optional, in/out -> "intptr"
; Context : void** optional, 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procInitOnceExecuteOnce = kernel32.NewProc("InitOnceExecuteOnce")
)

// InitOnce (INIT_ONCE* in/out), InitFn (PINIT_ONCE_FN), Parameter (void* optional, in/out), Context (void** optional, out)
r1, _, err := procInitOnceExecuteOnce.Call(
	uintptr(InitOnce),
	uintptr(InitFn),
	uintptr(Parameter),
	uintptr(Context),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function InitOnceExecuteOnce(
  InitOnce: Pointer;   // INIT_ONCE* in/out
  InitFn: Pointer;   // PINIT_ONCE_FN
  Parameter: Pointer;   // void* optional, in/out
  Context: Pointer   // void** optional, out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'InitOnceExecuteOnce';

result := DllCall("KERNEL32\InitOnceExecuteOnce"
    , "Ptr", InitOnce   ; INIT_ONCE* in/out
    , "Ptr", InitFn   ; PINIT_ONCE_FN
    , "Ptr", Parameter   ; void* optional, in/out
    , "Ptr", Context   ; void** optional, out
    , "Int")   ; return: BOOL

●InitOnceExecuteOnce(InitOnce, InitFn, Parameter, Context) = DLL("KERNEL32.dll", "bool InitOnceExecuteOnce(void*, void*, void*, void*)")
# 呼び出し: InitOnceExecuteOnce(InitOnce, InitFn, Parameter, Context)
# InitOnce : INIT_ONCE* in/out -> "void*"
# InitFn : PINIT_ONCE_FN -> "void*"
# Parameter : void* optional, in/out -> "void*"
# Context : void** optional, 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)。