VirtualAlloc

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

void* VirtualAlloc(
    void* lpAddress,   // optional
    UINT_PTR dwSize,
    VIRTUAL_ALLOCATION_TYPE flAllocationType,
    PAGE_PROTECTION_FLAGS flProtect
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function VirtualAlloc(
    lpAddress As IntPtr,   ' void* optional
    dwSize As UIntPtr,   ' UINT_PTR
    flAllocationType As UInteger,   ' VIRTUAL_ALLOCATION_TYPE
    flProtect As UInteger   ' PAGE_PROTECTION_FLAGS
) As IntPtr
End Function

' lpAddress : void* optional
' dwSize : UINT_PTR
' flAllocationType : VIRTUAL_ALLOCATION_TYPE
' flProtect : PAGE_PROTECTION_FLAGS
Declare PtrSafe Function VirtualAlloc Lib "kernel32" ( _
    ByVal lpAddress As LongPtr, _
    ByVal dwSize As LongPtr, _
    ByVal flAllocationType As Long, _
    ByVal flProtect 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

VirtualAlloc = ctypes.windll.kernel32.VirtualAlloc
VirtualAlloc.restype = ctypes.c_void_p
VirtualAlloc.argtypes = [
    ctypes.POINTER(None),  # lpAddress : void* optional
    ctypes.c_size_t,  # dwSize : UINT_PTR
    wintypes.DWORD,  # flAllocationType : VIRTUAL_ALLOCATION_TYPE
    wintypes.DWORD,  # flProtect : PAGE_PROTECTION_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
VirtualAlloc = Fiddle::Function.new(
  lib['VirtualAlloc'],
  [
    Fiddle::TYPE_VOIDP,  # lpAddress : void* optional
    Fiddle::TYPE_UINTPTR_T,  # dwSize : UINT_PTR
    -Fiddle::TYPE_INT,  # flAllocationType : VIRTUAL_ALLOCATION_TYPE
    -Fiddle::TYPE_INT,  # flProtect : PAGE_PROTECTION_FLAGS
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "kernel32")]
extern "system" {
    fn VirtualAlloc(
        lpAddress: *mut (),  // void* optional
        dwSize: usize,  // UINT_PTR
        flAllocationType: u32,  // VIRTUAL_ALLOCATION_TYPE
        flProtect: u32  // PAGE_PROTECTION_FLAGS
    ) -> *mut ();
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern IntPtr VirtualAlloc(IntPtr lpAddress, UIntPtr dwSize, uint flAllocationType, uint flProtect);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_VirtualAlloc' -Namespace Win32 -PassThru
# $api::VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect)

#uselib "KERNEL32.dll"
#func global VirtualAlloc "VirtualAlloc" sptr, sptr, sptr, sptr
; VirtualAlloc lpAddress, dwSize, flAllocationType, flProtect   ; 戻り値は stat
; lpAddress : void* optional -> "sptr"
; dwSize : UINT_PTR -> "sptr"
; flAllocationType : VIRTUAL_ALLOCATION_TYPE -> "sptr"
; flProtect : PAGE_PROTECTION_FLAGS -> "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 VirtualAlloc "VirtualAlloc" sptr, sptr, int, int
; res = VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect)
; lpAddress : void* optional -> "sptr"
; dwSize : UINT_PTR -> "sptr"
; flAllocationType : VIRTUAL_ALLOCATION_TYPE -> "int"
; flProtect : PAGE_PROTECTION_FLAGS -> "int"

; void* VirtualAlloc(void* lpAddress, UINT_PTR dwSize, VIRTUAL_ALLOCATION_TYPE flAllocationType, PAGE_PROTECTION_FLAGS flProtect)
#uselib "KERNEL32.dll"
#cfunc global VirtualAlloc "VirtualAlloc" intptr, intptr, int, int
; res = VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect)
; lpAddress : void* optional -> "intptr"
; dwSize : UINT_PTR -> "intptr"
; flAllocationType : VIRTUAL_ALLOCATION_TYPE -> "int"
; flProtect : PAGE_PROTECTION_FLAGS -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procVirtualAlloc = kernel32.NewProc("VirtualAlloc")
)

// lpAddress (void* optional), dwSize (UINT_PTR), flAllocationType (VIRTUAL_ALLOCATION_TYPE), flProtect (PAGE_PROTECTION_FLAGS)
r1, _, err := procVirtualAlloc.Call(
	uintptr(lpAddress),
	uintptr(dwSize),
	uintptr(flAllocationType),
	uintptr(flProtect),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void*

function VirtualAlloc(
  lpAddress: Pointer;   // void* optional
  dwSize: NativeUInt;   // UINT_PTR
  flAllocationType: DWORD;   // VIRTUAL_ALLOCATION_TYPE
  flProtect: DWORD   // PAGE_PROTECTION_FLAGS
): Pointer; stdcall;
  external 'KERNEL32.dll' name 'VirtualAlloc';

result := DllCall("KERNEL32\VirtualAlloc"
    , "Ptr", lpAddress   ; void* optional
    , "UPtr", dwSize   ; UINT_PTR
    , "UInt", flAllocationType   ; VIRTUAL_ALLOCATION_TYPE
    , "UInt", flProtect   ; PAGE_PROTECTION_FLAGS
    , "Ptr")   ; return: void*

●VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect) = DLL("KERNEL32.dll", "void* VirtualAlloc(void*, int, dword, dword)")
# 呼び出し: VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect)
# lpAddress : void* optional -> "void*"
# dwSize : UINT_PTR -> "int"
# flAllocationType : VIRTUAL_ALLOCATION_TYPE -> "dword"
# flProtect : PAGE_PROTECTION_FLAGS -> "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)。