LocalShrink

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

UINT_PTR LocalShrink(
    HLOCAL hMem,
    DWORD cbNewSize
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function LocalShrink(
    hMem As IntPtr,   ' HLOCAL
    cbNewSize As UInteger   ' DWORD
) As UIntPtr
End Function

' hMem : HLOCAL
' cbNewSize : DWORD
Declare PtrSafe Function LocalShrink Lib "kernel32" ( _
    ByVal hMem As LongPtr, _
    ByVal cbNewSize 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

LocalShrink = ctypes.windll.kernel32.LocalShrink
LocalShrink.restype = ctypes.c_size_t
LocalShrink.argtypes = [
    wintypes.HANDLE,  # hMem : HLOCAL
    wintypes.DWORD,  # cbNewSize : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
LocalShrink = Fiddle::Function.new(
  lib['LocalShrink'],
  [
    Fiddle::TYPE_VOIDP,  # hMem : HLOCAL
    -Fiddle::TYPE_INT,  # cbNewSize : DWORD
  ],
  Fiddle::TYPE_UINTPTR_T)

#[link(name = "kernel32")]
extern "system" {
    fn LocalShrink(
        hMem: *mut core::ffi::c_void,  // HLOCAL
        cbNewSize: u32  // DWORD
    ) -> usize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern UIntPtr LocalShrink(IntPtr hMem, uint cbNewSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_LocalShrink' -Namespace Win32 -PassThru
# $api::LocalShrink(hMem, cbNewSize)

#uselib "KERNEL32.dll"
#func global LocalShrink "LocalShrink" sptr, sptr
; LocalShrink hMem, cbNewSize   ; 戻り値は stat
; hMem : HLOCAL -> "sptr"
; cbNewSize : DWORD -> "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 LocalShrink "LocalShrink" sptr, int
; res = LocalShrink(hMem, cbNewSize)
; hMem : HLOCAL -> "sptr"
; cbNewSize : DWORD -> "int"

; UINT_PTR LocalShrink(HLOCAL hMem, DWORD cbNewSize)
#uselib "KERNEL32.dll"
#cfunc global LocalShrink "LocalShrink" intptr, int
; res = LocalShrink(hMem, cbNewSize)
; hMem : HLOCAL -> "intptr"
; cbNewSize : DWORD -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procLocalShrink = kernel32.NewProc("LocalShrink")
)

// hMem (HLOCAL), cbNewSize (DWORD)
r1, _, err := procLocalShrink.Call(
	uintptr(hMem),
	uintptr(cbNewSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // UINT_PTR

function LocalShrink(
  hMem: THandle;   // HLOCAL
  cbNewSize: DWORD   // DWORD
): NativeUInt; stdcall;
  external 'KERNEL32.dll' name 'LocalShrink';

result := DllCall("KERNEL32\LocalShrink"
    , "Ptr", hMem   ; HLOCAL
    , "UInt", cbNewSize   ; DWORD
    , "UPtr")   ; return: UINT_PTR

●LocalShrink(hMem, cbNewSize) = DLL("KERNEL32.dll", "int LocalShrink(void*, dword)")
# 呼び出し: LocalShrink(hMem, cbNewSize)
# hMem : HLOCAL -> "void*"
# cbNewSize : DWORD -> "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)。