StrFormatKBSizeW

// SHLWAPI.dll  (Unicode / -W)
#include <windows.h>

LPWSTR StrFormatKBSizeW(
    LONGLONG qdw,
    LPWSTR pszBuf,
    DWORD cchBuf
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function StrFormatKBSizeW(
    qdw As Long,   ' LONGLONG
    <MarshalAs(UnmanagedType.LPWStr)> pszBuf As System.Text.StringBuilder,   ' LPWSTR out
    cchBuf As UInteger   ' DWORD
) As IntPtr
End Function

' qdw : LONGLONG
' pszBuf : LPWSTR out
' cchBuf : DWORD
Declare PtrSafe Function StrFormatKBSizeW Lib "shlwapi" ( _
    ByVal qdw As LongLong, _
    ByVal pszBuf As LongPtr, _
    ByVal cchBuf As Long) As LongPtr
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

StrFormatKBSizeW = ctypes.windll.shlwapi.StrFormatKBSizeW
StrFormatKBSizeW.restype = wintypes.LPWSTR
StrFormatKBSizeW.argtypes = [
    ctypes.c_longlong,  # qdw : LONGLONG
    wintypes.LPWSTR,  # pszBuf : LPWSTR out
    wintypes.DWORD,  # cchBuf : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
StrFormatKBSizeW = Fiddle::Function.new(
  lib['StrFormatKBSizeW'],
  [
    Fiddle::TYPE_LONG_LONG,  # qdw : LONGLONG
    Fiddle::TYPE_VOIDP,  # pszBuf : LPWSTR out
    -Fiddle::TYPE_INT,  # cchBuf : DWORD
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shlwapi")]
extern "system" {
    fn StrFormatKBSizeW(
        qdw: i64,  // LONGLONG
        pszBuf: *mut u16,  // LPWSTR out
        cchBuf: u32  // DWORD
    ) -> *mut u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr StrFormatKBSizeW(long qdw, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszBuf, uint cchBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_StrFormatKBSizeW' -Namespace Win32 -PassThru
# $api::StrFormatKBSizeW(qdw, pszBuf, cchBuf)

#uselib "SHLWAPI.dll"
#func global StrFormatKBSizeW "StrFormatKBSizeW" wptr, wptr, wptr
; StrFormatKBSizeW qdw, varptr(pszBuf), cchBuf   ; 戻り値は stat
; qdw : LONGLONG -> "wptr"
; pszBuf : LPWSTR out -> "wptr"
; cchBuf : DWORD -> "wptr"
; ※HSP3.7は int64 引数(64bit値渡し)に非対応です。
; ※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 "SHLWAPI.dll"
#cfunc global StrFormatKBSizeW "StrFormatKBSizeW" int64, var, int
; res = StrFormatKBSizeW(qdw, pszBuf, cchBuf)
; qdw : LONGLONG -> "int64"
; pszBuf : LPWSTR out -> "var"
; cchBuf : DWORD -> "int"
; ※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。
; ※int64 引数の DLL 値渡しは x64 ランタイム(hsp3_64)のみ対応(x86 は未対応)。

; LPWSTR StrFormatKBSizeW(LONGLONG qdw, LPWSTR pszBuf, DWORD cchBuf)
#uselib "SHLWAPI.dll"
#cfunc global StrFormatKBSizeW "StrFormatKBSizeW" int64, var, int
; res = StrFormatKBSizeW(qdw, pszBuf, cchBuf)
; qdw : LONGLONG -> "int64"
; pszBuf : LPWSTR out -> "var"
; cchBuf : DWORD -> "int"
; ※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。

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procStrFormatKBSizeW = shlwapi.NewProc("StrFormatKBSizeW")
)

// qdw (LONGLONG), pszBuf (LPWSTR out), cchBuf (DWORD)
r1, _, err := procStrFormatKBSizeW.Call(
	uintptr(qdw),
	uintptr(pszBuf),
	uintptr(cchBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPWSTR

function StrFormatKBSizeW(
  qdw: Int64;   // LONGLONG
  pszBuf: PWideChar;   // LPWSTR out
  cchBuf: DWORD   // DWORD
): PWideChar; stdcall;
  external 'SHLWAPI.dll' name 'StrFormatKBSizeW';

result := DllCall("SHLWAPI\StrFormatKBSizeW"
    , "Int64", qdw   ; LONGLONG
    , "Ptr", pszBuf   ; LPWSTR out
    , "UInt", cchBuf   ; DWORD
    , "Ptr")   ; return: LPWSTR

●StrFormatKBSizeW(qdw, pszBuf, cchBuf) = DLL("SHLWAPI.dll", "char* StrFormatKBSizeW(int64, char*, dword)")
# 呼び出し: StrFormatKBSizeW(qdw, pszBuf, cchBuf)
# qdw : LONGLONG -> "int64"
# pszBuf : LPWSTR out -> "char*"
# cchBuf : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。