GetTempPath2W

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

DWORD GetTempPath2W(
    DWORD BufferLength,
    LPWSTR Buffer   // optional
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetTempPath2W(
    BufferLength As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> Buffer As System.Text.StringBuilder   ' LPWSTR optional, out
) As UInteger
End Function

' BufferLength : DWORD
' Buffer : LPWSTR optional, out
Declare PtrSafe Function GetTempPath2W Lib "kernel32" ( _
    ByVal BufferLength As Long, _
    ByVal Buffer As LongPtr) As Long
' 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

GetTempPath2W = ctypes.windll.kernel32.GetTempPath2W
GetTempPath2W.restype = wintypes.DWORD
GetTempPath2W.argtypes = [
    wintypes.DWORD,  # BufferLength : DWORD
    wintypes.LPWSTR,  # Buffer : LPWSTR optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetTempPath2W = Fiddle::Function.new(
  lib['GetTempPath2W'],
  [
    -Fiddle::TYPE_INT,  # BufferLength : DWORD
    Fiddle::TYPE_VOIDP,  # Buffer : LPWSTR optional, out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn GetTempPath2W(
        BufferLength: u32,  // DWORD
        Buffer: *mut u16  // LPWSTR optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode)]
public static extern uint GetTempPath2W(uint BufferLength, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder Buffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetTempPath2W' -Namespace Win32 -PassThru
# $api::GetTempPath2W(BufferLength, Buffer)

#uselib "KERNEL32.dll"
#func global GetTempPath2W "GetTempPath2W" wptr, wptr
; GetTempPath2W BufferLength, varptr(Buffer)   ; 戻り値は stat
; BufferLength : DWORD -> "wptr"
; Buffer : LPWSTR optional, out -> "wptr"
; ※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 GetTempPath2W "GetTempPath2W" int, var
; res = GetTempPath2W(BufferLength, Buffer)
; BufferLength : DWORD -> "int"
; Buffer : LPWSTR optional, 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。

; DWORD GetTempPath2W(DWORD BufferLength, LPWSTR Buffer)
#uselib "KERNEL32.dll"
#cfunc global GetTempPath2W "GetTempPath2W" int, var
; res = GetTempPath2W(BufferLength, Buffer)
; BufferLength : DWORD -> "int"
; Buffer : LPWSTR optional, 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。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetTempPath2W = kernel32.NewProc("GetTempPath2W")
)

// BufferLength (DWORD), Buffer (LPWSTR optional, out)
r1, _, err := procGetTempPath2W.Call(
	uintptr(BufferLength),
	uintptr(Buffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetTempPath2W(
  BufferLength: DWORD;   // DWORD
  Buffer: PWideChar   // LPWSTR optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetTempPath2W';

result := DllCall("KERNEL32\GetTempPath2W"
    , "UInt", BufferLength   ; DWORD
    , "Ptr", Buffer   ; LPWSTR optional, out
    , "UInt")   ; return: DWORD

●GetTempPath2W(BufferLength, Buffer) = DLL("KERNEL32.dll", "dword GetTempPath2W(dword, char*)")
# 呼び出し: GetTempPath2W(BufferLength, Buffer)
# BufferLength : DWORD -> "dword"
# Buffer : LPWSTR optional, out -> "char*"
# 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。