HeapSize

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

UINT_PTR HeapSize(
    HANDLE hHeap,
    HEAP_FLAGS dwFlags,
    const void* lpMem
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function HeapSize(
    hHeap As IntPtr,   ' HANDLE
    dwFlags As UInteger,   ' HEAP_FLAGS
    lpMem As IntPtr   ' void*
) As UIntPtr
End Function

' hHeap : HANDLE
' dwFlags : HEAP_FLAGS
' lpMem : void*
Declare PtrSafe Function HeapSize Lib "kernel32" ( _
    ByVal hHeap As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal lpMem As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

HeapSize = ctypes.windll.kernel32.HeapSize
HeapSize.restype = ctypes.c_size_t
HeapSize.argtypes = [
    wintypes.HANDLE,  # hHeap : HANDLE
    wintypes.DWORD,  # dwFlags : HEAP_FLAGS
    ctypes.POINTER(None),  # lpMem : void*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
HeapSize = Fiddle::Function.new(
  lib['HeapSize'],
  [
    Fiddle::TYPE_VOIDP,  # hHeap : HANDLE
    -Fiddle::TYPE_INT,  # dwFlags : HEAP_FLAGS
    Fiddle::TYPE_VOIDP,  # lpMem : void*
  ],
  Fiddle::TYPE_UINTPTR_T)

#[link(name = "kernel32")]
extern "system" {
    fn HeapSize(
        hHeap: *mut core::ffi::c_void,  // HANDLE
        dwFlags: u32,  // HEAP_FLAGS
        lpMem: *const ()  // void*
    ) -> usize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern UIntPtr HeapSize(IntPtr hHeap, uint dwFlags, IntPtr lpMem);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_HeapSize' -Namespace Win32 -PassThru
# $api::HeapSize(hHeap, dwFlags, lpMem)

#uselib "KERNEL32.dll"
#func global HeapSize "HeapSize" sptr, sptr, sptr
; HeapSize hHeap, dwFlags, lpMem   ; 戻り値は stat
; hHeap : HANDLE -> "sptr"
; dwFlags : HEAP_FLAGS -> "sptr"
; lpMem : void* -> "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 HeapSize "HeapSize" sptr, int, sptr
; res = HeapSize(hHeap, dwFlags, lpMem)
; hHeap : HANDLE -> "sptr"
; dwFlags : HEAP_FLAGS -> "int"
; lpMem : void* -> "sptr"

; UINT_PTR HeapSize(HANDLE hHeap, HEAP_FLAGS dwFlags, void* lpMem)
#uselib "KERNEL32.dll"
#cfunc global HeapSize "HeapSize" intptr, int, intptr
; res = HeapSize(hHeap, dwFlags, lpMem)
; hHeap : HANDLE -> "intptr"
; dwFlags : HEAP_FLAGS -> "int"
; lpMem : void* -> "intptr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procHeapSize = kernel32.NewProc("HeapSize")
)

// hHeap (HANDLE), dwFlags (HEAP_FLAGS), lpMem (void*)
r1, _, err := procHeapSize.Call(
	uintptr(hHeap),
	uintptr(dwFlags),
	uintptr(lpMem),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // UINT_PTR

function HeapSize(
  hHeap: THandle;   // HANDLE
  dwFlags: DWORD;   // HEAP_FLAGS
  lpMem: Pointer   // void*
): NativeUInt; stdcall;
  external 'KERNEL32.dll' name 'HeapSize';

result := DllCall("KERNEL32\HeapSize"
    , "Ptr", hHeap   ; HANDLE
    , "UInt", dwFlags   ; HEAP_FLAGS
    , "Ptr", lpMem   ; void*
    , "UPtr")   ; return: UINT_PTR

●HeapSize(hHeap, dwFlags, lpMem) = DLL("KERNEL32.dll", "int HeapSize(void*, dword, void*)")
# 呼び出し: HeapSize(hHeap, dwFlags, lpMem)
# hHeap : HANDLE -> "void*"
# dwFlags : HEAP_FLAGS -> "dword"
# lpMem : void* -> "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)。