DiscardVirtualMemory

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

DWORD DiscardVirtualMemory(
    void* VirtualAddress,
    UINT_PTR Size
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function DiscardVirtualMemory(
    VirtualAddress As IntPtr,   ' void* in/out
    Size As UIntPtr   ' UINT_PTR
) As UInteger
End Function

' VirtualAddress : void* in/out
' Size : UINT_PTR
Declare PtrSafe Function DiscardVirtualMemory Lib "kernel32" ( _
    ByVal VirtualAddress As LongPtr, _
    ByVal Size 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

DiscardVirtualMemory = ctypes.windll.kernel32.DiscardVirtualMemory
DiscardVirtualMemory.restype = wintypes.DWORD
DiscardVirtualMemory.argtypes = [
    ctypes.POINTER(None),  # VirtualAddress : void* in/out
    ctypes.c_size_t,  # Size : UINT_PTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
DiscardVirtualMemory = Fiddle::Function.new(
  lib['DiscardVirtualMemory'],
  [
    Fiddle::TYPE_VOIDP,  # VirtualAddress : void* in/out
    Fiddle::TYPE_UINTPTR_T,  # Size : UINT_PTR
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn DiscardVirtualMemory(
        VirtualAddress: *mut (),  // void* in/out
        Size: usize  // UINT_PTR
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern uint DiscardVirtualMemory(IntPtr VirtualAddress, UIntPtr Size);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_DiscardVirtualMemory' -Namespace Win32 -PassThru
# $api::DiscardVirtualMemory(VirtualAddress, Size)

#uselib "KERNEL32.dll"
#func global DiscardVirtualMemory "DiscardVirtualMemory" sptr, sptr
; DiscardVirtualMemory VirtualAddress, Size   ; 戻り値は stat
; VirtualAddress : void* in/out -> "sptr"
; Size : UINT_PTR -> "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 DiscardVirtualMemory "DiscardVirtualMemory" sptr, sptr
; res = DiscardVirtualMemory(VirtualAddress, Size)
; VirtualAddress : void* in/out -> "sptr"
; Size : UINT_PTR -> "sptr"

; DWORD DiscardVirtualMemory(void* VirtualAddress, UINT_PTR Size)
#uselib "KERNEL32.dll"
#cfunc global DiscardVirtualMemory "DiscardVirtualMemory" intptr, intptr
; res = DiscardVirtualMemory(VirtualAddress, Size)
; VirtualAddress : void* in/out -> "intptr"
; Size : UINT_PTR -> "intptr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procDiscardVirtualMemory = kernel32.NewProc("DiscardVirtualMemory")
)

// VirtualAddress (void* in/out), Size (UINT_PTR)
r1, _, err := procDiscardVirtualMemory.Call(
	uintptr(VirtualAddress),
	uintptr(Size),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DiscardVirtualMemory(
  VirtualAddress: Pointer;   // void* in/out
  Size: NativeUInt   // UINT_PTR
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'DiscardVirtualMemory';

result := DllCall("KERNEL32\DiscardVirtualMemory"
    , "Ptr", VirtualAddress   ; void* in/out
    , "UPtr", Size   ; UINT_PTR
    , "UInt")   ; return: DWORD

●DiscardVirtualMemory(VirtualAddress, Size) = DLL("KERNEL32.dll", "dword DiscardVirtualMemory(void*, int)")
# 呼び出し: DiscardVirtualMemory(VirtualAddress, Size)
# VirtualAddress : void* in/out -> "void*"
# Size : UINT_PTR -> "int"
# 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)。