VirtualProtect

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

BOOL VirtualProtect(
    void* lpAddress,
    UINT_PTR dwSize,
    PAGE_PROTECTION_FLAGS flNewProtect,
    PAGE_PROTECTION_FLAGS* lpflOldProtect
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function VirtualProtect(
    lpAddress As IntPtr,   ' void*
    dwSize As UIntPtr,   ' UINT_PTR
    flNewProtect As UInteger,   ' PAGE_PROTECTION_FLAGS
    <Out> ByRef lpflOldProtect As UInteger   ' PAGE_PROTECTION_FLAGS* out
) As Boolean
End Function

' lpAddress : void*
' dwSize : UINT_PTR
' flNewProtect : PAGE_PROTECTION_FLAGS
' lpflOldProtect : PAGE_PROTECTION_FLAGS* out
Declare PtrSafe Function VirtualProtect Lib "kernel32" ( _
    ByVal lpAddress As LongPtr, _
    ByVal dwSize As LongPtr, _
    ByVal flNewProtect As Long, _
    ByRef lpflOldProtect 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

VirtualProtect = ctypes.windll.kernel32.VirtualProtect
VirtualProtect.restype = wintypes.BOOL
VirtualProtect.argtypes = [
    ctypes.POINTER(None),  # lpAddress : void*
    ctypes.c_size_t,  # dwSize : UINT_PTR
    wintypes.DWORD,  # flNewProtect : PAGE_PROTECTION_FLAGS
    ctypes.c_void_p,  # lpflOldProtect : PAGE_PROTECTION_FLAGS* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
VirtualProtect = Fiddle::Function.new(
  lib['VirtualProtect'],
  [
    Fiddle::TYPE_VOIDP,  # lpAddress : void*
    Fiddle::TYPE_UINTPTR_T,  # dwSize : UINT_PTR
    -Fiddle::TYPE_INT,  # flNewProtect : PAGE_PROTECTION_FLAGS
    Fiddle::TYPE_VOIDP,  # lpflOldProtect : PAGE_PROTECTION_FLAGS* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn VirtualProtect(
        lpAddress: *mut (),  // void*
        dwSize: usize,  // UINT_PTR
        flNewProtect: u32,  // PAGE_PROTECTION_FLAGS
        lpflOldProtect: *mut u32  // PAGE_PROTECTION_FLAGS* 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 VirtualProtect(IntPtr lpAddress, UIntPtr dwSize, uint flNewProtect, out uint lpflOldProtect);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_VirtualProtect' -Namespace Win32 -PassThru
# $api::VirtualProtect(lpAddress, dwSize, flNewProtect, lpflOldProtect)

#uselib "KERNEL32.dll"
#func global VirtualProtect "VirtualProtect" sptr, sptr, sptr, sptr
; VirtualProtect lpAddress, dwSize, flNewProtect, lpflOldProtect   ; 戻り値は stat
; lpAddress : void* -> "sptr"
; dwSize : UINT_PTR -> "sptr"
; flNewProtect : PAGE_PROTECTION_FLAGS -> "sptr"
; lpflOldProtect : PAGE_PROTECTION_FLAGS* 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 VirtualProtect "VirtualProtect" sptr, sptr, int, int
; res = VirtualProtect(lpAddress, dwSize, flNewProtect, lpflOldProtect)
; lpAddress : void* -> "sptr"
; dwSize : UINT_PTR -> "sptr"
; flNewProtect : PAGE_PROTECTION_FLAGS -> "int"
; lpflOldProtect : PAGE_PROTECTION_FLAGS* out -> "int"

; BOOL VirtualProtect(void* lpAddress, UINT_PTR dwSize, PAGE_PROTECTION_FLAGS flNewProtect, PAGE_PROTECTION_FLAGS* lpflOldProtect)
#uselib "KERNEL32.dll"
#cfunc global VirtualProtect "VirtualProtect" intptr, intptr, int, int
; res = VirtualProtect(lpAddress, dwSize, flNewProtect, lpflOldProtect)
; lpAddress : void* -> "intptr"
; dwSize : UINT_PTR -> "intptr"
; flNewProtect : PAGE_PROTECTION_FLAGS -> "int"
; lpflOldProtect : PAGE_PROTECTION_FLAGS* out -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procVirtualProtect = kernel32.NewProc("VirtualProtect")
)

// lpAddress (void*), dwSize (UINT_PTR), flNewProtect (PAGE_PROTECTION_FLAGS), lpflOldProtect (PAGE_PROTECTION_FLAGS* out)
r1, _, err := procVirtualProtect.Call(
	uintptr(lpAddress),
	uintptr(dwSize),
	uintptr(flNewProtect),
	uintptr(lpflOldProtect),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function VirtualProtect(
  lpAddress: Pointer;   // void*
  dwSize: NativeUInt;   // UINT_PTR
  flNewProtect: DWORD;   // PAGE_PROTECTION_FLAGS
  lpflOldProtect: Pointer   // PAGE_PROTECTION_FLAGS* out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'VirtualProtect';

result := DllCall("KERNEL32\VirtualProtect"
    , "Ptr", lpAddress   ; void*
    , "UPtr", dwSize   ; UINT_PTR
    , "UInt", flNewProtect   ; PAGE_PROTECTION_FLAGS
    , "Ptr", lpflOldProtect   ; PAGE_PROTECTION_FLAGS* out
    , "Int")   ; return: BOOL

●VirtualProtect(lpAddress, dwSize, flNewProtect, lpflOldProtect) = DLL("KERNEL32.dll", "bool VirtualProtect(void*, int, dword, void*)")
# 呼び出し: VirtualProtect(lpAddress, dwSize, flNewProtect, lpflOldProtect)
# lpAddress : void* -> "void*"
# dwSize : UINT_PTR -> "int"
# flNewProtect : PAGE_PROTECTION_FLAGS -> "dword"
# lpflOldProtect : PAGE_PROTECTION_FLAGS* 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)。