LocalAlloc

関数

ローカルヒープからメモリを割り当てる。

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>

HLOCAL LocalAlloc(
    LOCAL_ALLOC_FLAGS uFlags,
    UINT_PTR uBytes
);

パラメーター

名前	型	方向
uFlags	LOCAL_ALLOC_FLAGS	in
uBytes	UINT_PTR	in

戻り値の型: HLOCAL

各言語での呼び出し定義

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

HLOCAL LocalAlloc(
    LOCAL_ALLOC_FLAGS uFlags,
    UINT_PTR uBytes
);

[DllImport("KERNEL32.dll", SetLastError = true, ExactSpelling = true)]
static extern IntPtr LocalAlloc(
    uint uFlags,   // LOCAL_ALLOC_FLAGS
    UIntPtr uBytes   // UINT_PTR
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function LocalAlloc(
    uFlags As UInteger,   ' LOCAL_ALLOC_FLAGS
    uBytes As UIntPtr   ' UINT_PTR
) As IntPtr
End Function

' uFlags : LOCAL_ALLOC_FLAGS
' uBytes : UINT_PTR
Declare PtrSafe Function LocalAlloc Lib "kernel32" ( _
    ByVal uFlags As Long, _
    ByVal uBytes 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

LocalAlloc = ctypes.windll.kernel32.LocalAlloc
LocalAlloc.restype = ctypes.c_void_p
LocalAlloc.argtypes = [
    wintypes.DWORD,  # uFlags : LOCAL_ALLOC_FLAGS
    ctypes.c_size_t,  # uBytes : UINT_PTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
LocalAlloc = Fiddle::Function.new(
  lib['LocalAlloc'],
  [
    -Fiddle::TYPE_INT,  # uFlags : LOCAL_ALLOC_FLAGS
    Fiddle::TYPE_UINTPTR_T,  # uBytes : UINT_PTR
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "kernel32")]
extern "system" {
    fn LocalAlloc(
        uFlags: u32,  // LOCAL_ALLOC_FLAGS
        uBytes: usize  // UINT_PTR
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern IntPtr LocalAlloc(uint uFlags, UIntPtr uBytes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_LocalAlloc' -Namespace Win32 -PassThru
# $api::LocalAlloc(uFlags, uBytes)

#uselib "KERNEL32.dll"
#func global LocalAlloc "LocalAlloc" sptr, sptr
; LocalAlloc uFlags, uBytes   ; 戻り値は stat
; uFlags : LOCAL_ALLOC_FLAGS -> "sptr"
; uBytes : 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 LocalAlloc "LocalAlloc" int, sptr
; res = LocalAlloc(uFlags, uBytes)
; uFlags : LOCAL_ALLOC_FLAGS -> "int"
; uBytes : UINT_PTR -> "sptr"

; HLOCAL LocalAlloc(LOCAL_ALLOC_FLAGS uFlags, UINT_PTR uBytes)
#uselib "KERNEL32.dll"
#cfunc global LocalAlloc "LocalAlloc" int, intptr
; res = LocalAlloc(uFlags, uBytes)
; uFlags : LOCAL_ALLOC_FLAGS -> "int"
; uBytes : UINT_PTR -> "intptr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procLocalAlloc = kernel32.NewProc("LocalAlloc")
)

// uFlags (LOCAL_ALLOC_FLAGS), uBytes (UINT_PTR)
r1, _, err := procLocalAlloc.Call(
	uintptr(uFlags),
	uintptr(uBytes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HLOCAL

function LocalAlloc(
  uFlags: DWORD;   // LOCAL_ALLOC_FLAGS
  uBytes: NativeUInt   // UINT_PTR
): THandle; stdcall;
  external 'KERNEL32.dll' name 'LocalAlloc';

result := DllCall("KERNEL32\LocalAlloc"
    , "UInt", uFlags   ; LOCAL_ALLOC_FLAGS
    , "UPtr", uBytes   ; UINT_PTR
    , "Ptr")   ; return: HLOCAL

●LocalAlloc(uFlags, uBytes) = DLL("KERNEL32.dll", "void* LocalAlloc(dword, int)")
# 呼び出し: LocalAlloc(uFlags, uBytes)
# uFlags : LOCAL_ALLOC_FLAGS -> "dword"
# uBytes : 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)。