GetTempFileNameW

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

DWORD GetTempFileNameW(
    LPCWSTR lpPathName,
    LPCWSTR lpPrefixString,
    DWORD uUnique,
    LPWSTR lpTempFileName
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetTempFileNameW(
    <MarshalAs(UnmanagedType.LPWStr)> lpPathName As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpPrefixString As String,   ' LPCWSTR
    uUnique As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpTempFileName As System.Text.StringBuilder   ' LPWSTR out
) As UInteger
End Function

' lpPathName : LPCWSTR
' lpPrefixString : LPCWSTR
' uUnique : DWORD
' lpTempFileName : LPWSTR out
Declare PtrSafe Function GetTempFileNameW Lib "kernel32" ( _
    ByVal lpPathName As LongPtr, _
    ByVal lpPrefixString As LongPtr, _
    ByVal uUnique As Long, _
    ByVal lpTempFileName 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

GetTempFileNameW = ctypes.windll.kernel32.GetTempFileNameW
GetTempFileNameW.restype = wintypes.DWORD
GetTempFileNameW.argtypes = [
    wintypes.LPCWSTR,  # lpPathName : LPCWSTR
    wintypes.LPCWSTR,  # lpPrefixString : LPCWSTR
    wintypes.DWORD,  # uUnique : DWORD
    wintypes.LPWSTR,  # lpTempFileName : LPWSTR out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetTempFileNameW = Fiddle::Function.new(
  lib['GetTempFileNameW'],
  [
    Fiddle::TYPE_VOIDP,  # lpPathName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpPrefixString : LPCWSTR
    -Fiddle::TYPE_INT,  # uUnique : DWORD
    Fiddle::TYPE_VOIDP,  # lpTempFileName : LPWSTR out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn GetTempFileNameW(
        lpPathName: *const u16,  // LPCWSTR
        lpPrefixString: *const u16,  // LPCWSTR
        uUnique: u32,  // DWORD
        lpTempFileName: *mut u16  // LPWSTR out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern uint GetTempFileNameW([MarshalAs(UnmanagedType.LPWStr)] string lpPathName, [MarshalAs(UnmanagedType.LPWStr)] string lpPrefixString, uint uUnique, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpTempFileName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetTempFileNameW' -Namespace Win32 -PassThru
# $api::GetTempFileNameW(lpPathName, lpPrefixString, uUnique, lpTempFileName)

#uselib "KERNEL32.dll"
#func global GetTempFileNameW "GetTempFileNameW" wptr, wptr, wptr, wptr
; GetTempFileNameW lpPathName, lpPrefixString, uUnique, varptr(lpTempFileName)   ; 戻り値は stat
; lpPathName : LPCWSTR -> "wptr"
; lpPrefixString : LPCWSTR -> "wptr"
; uUnique : DWORD -> "wptr"
; lpTempFileName : LPWSTR 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 GetTempFileNameW "GetTempFileNameW" wstr, wstr, int, var
; res = GetTempFileNameW(lpPathName, lpPrefixString, uUnique, lpTempFileName)
; lpPathName : LPCWSTR -> "wstr"
; lpPrefixString : LPCWSTR -> "wstr"
; uUnique : DWORD -> "int"
; lpTempFileName : LPWSTR 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 GetTempFileNameW(LPCWSTR lpPathName, LPCWSTR lpPrefixString, DWORD uUnique, LPWSTR lpTempFileName)
#uselib "KERNEL32.dll"
#cfunc global GetTempFileNameW "GetTempFileNameW" wstr, wstr, int, var
; res = GetTempFileNameW(lpPathName, lpPrefixString, uUnique, lpTempFileName)
; lpPathName : LPCWSTR -> "wstr"
; lpPrefixString : LPCWSTR -> "wstr"
; uUnique : DWORD -> "int"
; lpTempFileName : LPWSTR 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")
	procGetTempFileNameW = kernel32.NewProc("GetTempFileNameW")
)

// lpPathName (LPCWSTR), lpPrefixString (LPCWSTR), uUnique (DWORD), lpTempFileName (LPWSTR out)
r1, _, err := procGetTempFileNameW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpPathName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpPrefixString))),
	uintptr(uUnique),
	uintptr(lpTempFileName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetTempFileNameW(
  lpPathName: PWideChar;   // LPCWSTR
  lpPrefixString: PWideChar;   // LPCWSTR
  uUnique: DWORD;   // DWORD
  lpTempFileName: PWideChar   // LPWSTR out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetTempFileNameW';

result := DllCall("KERNEL32\GetTempFileNameW"
    , "WStr", lpPathName   ; LPCWSTR
    , "WStr", lpPrefixString   ; LPCWSTR
    , "UInt", uUnique   ; DWORD
    , "Ptr", lpTempFileName   ; LPWSTR out
    , "UInt")   ; return: DWORD

●GetTempFileNameW(lpPathName, lpPrefixString, uUnique, lpTempFileName) = DLL("KERNEL32.dll", "dword GetTempFileNameW(char*, char*, dword, char*)")
# 呼び出し: GetTempFileNameW(lpPathName, lpPrefixString, uUnique, lpTempFileName)
# lpPathName : LPCWSTR -> "char*"
# lpPrefixString : LPCWSTR -> "char*"
# uUnique : DWORD -> "dword"
# lpTempFileName : LPWSTR 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。