InitializeContext

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

BOOL InitializeContext(
    void* Buffer,   // optional
    CONTEXT_FLAGS ContextFlags,
    CONTEXT** Context,
    DWORD* ContextLength
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InitializeContext(
    Buffer As IntPtr,   ' void* optional, out
    ContextFlags As UInteger,   ' CONTEXT_FLAGS
    Context As IntPtr,   ' CONTEXT** out
    ByRef ContextLength As UInteger   ' DWORD* in/out
) As Boolean
End Function

' Buffer : void* optional, out
' ContextFlags : CONTEXT_FLAGS
' Context : CONTEXT** out
' ContextLength : DWORD* in/out
Declare PtrSafe Function InitializeContext Lib "kernel32" ( _
    ByVal Buffer As LongPtr, _
    ByVal ContextFlags As Long, _
    ByVal Context As LongPtr, _
    ByRef ContextLength As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

InitializeContext = ctypes.windll.kernel32.InitializeContext
InitializeContext.restype = wintypes.BOOL
InitializeContext.argtypes = [
    ctypes.POINTER(None),  # Buffer : void* optional, out
    wintypes.DWORD,  # ContextFlags : CONTEXT_FLAGS
    ctypes.c_void_p,  # Context : CONTEXT** out
    ctypes.POINTER(wintypes.DWORD),  # ContextLength : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
InitializeContext = Fiddle::Function.new(
  lib['InitializeContext'],
  [
    Fiddle::TYPE_VOIDP,  # Buffer : void* optional, out
    -Fiddle::TYPE_INT,  # ContextFlags : CONTEXT_FLAGS
    Fiddle::TYPE_VOIDP,  # Context : CONTEXT** out
    Fiddle::TYPE_VOIDP,  # ContextLength : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn InitializeContext(
        Buffer: *mut (),  // void* optional, out
        ContextFlags: u32,  // CONTEXT_FLAGS
        Context: *mut *mut CONTEXT,  // CONTEXT** out
        ContextLength: *mut u32  // DWORD* in/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 InitializeContext(IntPtr Buffer, uint ContextFlags, IntPtr Context, ref uint ContextLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_InitializeContext' -Namespace Win32 -PassThru
# $api::InitializeContext(Buffer, ContextFlags, Context, ContextLength)

#uselib "KERNEL32.dll"
#func global InitializeContext "InitializeContext" sptr, sptr, sptr, sptr
; InitializeContext Buffer, ContextFlags, varptr(Context), varptr(ContextLength)   ; 戻り値は stat
; Buffer : void* optional, out -> "sptr"
; ContextFlags : CONTEXT_FLAGS -> "sptr"
; Context : CONTEXT** out -> "sptr"
; ContextLength : DWORD* in/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 InitializeContext "InitializeContext" sptr, int, var, var
; res = InitializeContext(Buffer, ContextFlags, Context, ContextLength)
; Buffer : void* optional, out -> "sptr"
; ContextFlags : CONTEXT_FLAGS -> "int"
; Context : CONTEXT** out -> "var"
; ContextLength : DWORD* in/out -> "var"
; ※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 InitializeContext(void* Buffer, CONTEXT_FLAGS ContextFlags, CONTEXT** Context, DWORD* ContextLength)
#uselib "KERNEL32.dll"
#cfunc global InitializeContext "InitializeContext" intptr, int, var, var
; res = InitializeContext(Buffer, ContextFlags, Context, ContextLength)
; Buffer : void* optional, out -> "intptr"
; ContextFlags : CONTEXT_FLAGS -> "int"
; Context : CONTEXT** out -> "var"
; ContextLength : DWORD* in/out -> "var"
; ※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")
	procInitializeContext = kernel32.NewProc("InitializeContext")
)

// Buffer (void* optional, out), ContextFlags (CONTEXT_FLAGS), Context (CONTEXT** out), ContextLength (DWORD* in/out)
r1, _, err := procInitializeContext.Call(
	uintptr(Buffer),
	uintptr(ContextFlags),
	uintptr(Context),
	uintptr(ContextLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function InitializeContext(
  Buffer: Pointer;   // void* optional, out
  ContextFlags: DWORD;   // CONTEXT_FLAGS
  Context: Pointer;   // CONTEXT** out
  ContextLength: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'InitializeContext';

result := DllCall("KERNEL32\InitializeContext"
    , "Ptr", Buffer   ; void* optional, out
    , "UInt", ContextFlags   ; CONTEXT_FLAGS
    , "Ptr", Context   ; CONTEXT** out
    , "Ptr", ContextLength   ; DWORD* in/out
    , "Int")   ; return: BOOL

●InitializeContext(Buffer, ContextFlags, Context, ContextLength) = DLL("KERNEL32.dll", "bool InitializeContext(void*, dword, void*, void*)")
# 呼び出し: InitializeContext(Buffer, ContextFlags, Context, ContextLength)
# Buffer : void* optional, out -> "void*"
# ContextFlags : CONTEXT_FLAGS -> "dword"
# Context : CONTEXT** out -> "void*"
# ContextLength : DWORD* in/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)。