HeapWalk

関数

ヒープ内のメモリブロックを順に列挙する。

DLLKERNEL32.dll呼出規約winapiSetLastErrorあり対応OSWindows XP 以降

シグネチャ

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

BOOL HeapWalk(
    HANDLE hHeap,
    PROCESS_HEAP_ENTRY* lpEntry
);

パラメーター

名前	型	方向
hHeap	HANDLE	in
lpEntry	PROCESS_HEAP_ENTRY*	inout

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL HeapWalk(
    HANDLE hHeap,
    PROCESS_HEAP_ENTRY* lpEntry
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true, ExactSpelling = true)]
static extern bool HeapWalk(
    IntPtr hHeap,   // HANDLE
    IntPtr lpEntry   // PROCESS_HEAP_ENTRY* in/out
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function HeapWalk(
    hHeap As IntPtr,   ' HANDLE
    lpEntry As IntPtr   ' PROCESS_HEAP_ENTRY* in/out
) As Boolean
End Function

' hHeap : HANDLE
' lpEntry : PROCESS_HEAP_ENTRY* in/out
Declare PtrSafe Function HeapWalk Lib "kernel32" ( _
    ByVal hHeap As LongPtr, _
    ByVal lpEntry 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

HeapWalk = ctypes.windll.kernel32.HeapWalk
HeapWalk.restype = wintypes.BOOL
HeapWalk.argtypes = [
    wintypes.HANDLE,  # hHeap : HANDLE
    ctypes.c_void_p,  # lpEntry : PROCESS_HEAP_ENTRY* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
HeapWalk = Fiddle::Function.new(
  lib['HeapWalk'],
  [
    Fiddle::TYPE_VOIDP,  # hHeap : HANDLE
    Fiddle::TYPE_VOIDP,  # lpEntry : PROCESS_HEAP_ENTRY* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn HeapWalk(
        hHeap: *mut core::ffi::c_void,  // HANDLE
        lpEntry: *mut PROCESS_HEAP_ENTRY  // PROCESS_HEAP_ENTRY* 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 HeapWalk(IntPtr hHeap, IntPtr lpEntry);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_HeapWalk' -Namespace Win32 -PassThru
# $api::HeapWalk(hHeap, lpEntry)

#uselib "KERNEL32.dll"
#func global HeapWalk "HeapWalk" sptr, sptr
; HeapWalk hHeap, varptr(lpEntry)   ; 戻り値は stat
; hHeap : HANDLE -> "sptr"
; lpEntry : PROCESS_HEAP_ENTRY* 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。

出力引数:

#uselib "KERNEL32.dll"
#cfunc global HeapWalk "HeapWalk" sptr, var
; res = HeapWalk(hHeap, lpEntry)
; hHeap : HANDLE -> "sptr"
; lpEntry : PROCESS_HEAP_ENTRY* 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。#uselib "KERNEL32.dll"
#cfunc global HeapWalk "HeapWalk" sptr, sptr
; res = HeapWalk(hHeap, varptr(lpEntry))
; hHeap : HANDLE -> "sptr"
; lpEntry : PROCESS_HEAP_ENTRY* in/out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; BOOL HeapWalk(HANDLE hHeap, PROCESS_HEAP_ENTRY* lpEntry)
#uselib "KERNEL32.dll"
#cfunc global HeapWalk "HeapWalk" intptr, var
; res = HeapWalk(hHeap, lpEntry)
; hHeap : HANDLE -> "intptr"
; lpEntry : PROCESS_HEAP_ENTRY* 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 HeapWalk(HANDLE hHeap, PROCESS_HEAP_ENTRY* lpEntry)
#uselib "KERNEL32.dll"
#cfunc global HeapWalk "HeapWalk" intptr, intptr
; res = HeapWalk(hHeap, varptr(lpEntry))
; hHeap : HANDLE -> "intptr"
; lpEntry : PROCESS_HEAP_ENTRY* in/out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procHeapWalk = kernel32.NewProc("HeapWalk")
)

// hHeap (HANDLE), lpEntry (PROCESS_HEAP_ENTRY* in/out)
r1, _, err := procHeapWalk.Call(
	uintptr(hHeap),
	uintptr(lpEntry),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function HeapWalk(
  hHeap: THandle;   // HANDLE
  lpEntry: Pointer   // PROCESS_HEAP_ENTRY* in/out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'HeapWalk';

result := DllCall("KERNEL32\HeapWalk"
    , "Ptr", hHeap   ; HANDLE
    , "Ptr", lpEntry   ; PROCESS_HEAP_ENTRY* in/out
    , "Int")   ; return: BOOL

●HeapWalk(hHeap, lpEntry) = DLL("KERNEL32.dll", "bool HeapWalk(void*, void*)")
# 呼び出し: HeapWalk(hHeap, lpEntry)
# hHeap : HANDLE -> "void*"
# lpEntry : PROCESS_HEAP_ENTRY* 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)。