CharLowerBuffW

// USER32.dll  (Unicode / -W)
#include <windows.h>

DWORD CharLowerBuffW(
    LPWSTR lpsz,
    DWORD cchLength
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function CharLowerBuffW(
    <MarshalAs(UnmanagedType.LPWStr)> lpsz As System.Text.StringBuilder,   ' LPWSTR in/out
    cchLength As UInteger   ' DWORD
) As UInteger
End Function

' lpsz : LPWSTR in/out
' cchLength : DWORD
Declare PtrSafe Function CharLowerBuffW Lib "user32" ( _
    ByVal lpsz As LongPtr, _
    ByVal cchLength As Long) 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

CharLowerBuffW = ctypes.windll.user32.CharLowerBuffW
CharLowerBuffW.restype = wintypes.DWORD
CharLowerBuffW.argtypes = [
    wintypes.LPWSTR,  # lpsz : LPWSTR in/out
    wintypes.DWORD,  # cchLength : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CharLowerBuffW = Fiddle::Function.new(
  lib['CharLowerBuffW'],
  [
    Fiddle::TYPE_VOIDP,  # lpsz : LPWSTR in/out
    -Fiddle::TYPE_INT,  # cchLength : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn CharLowerBuffW(
        lpsz: *mut u16,  // LPWSTR in/out
        cchLength: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern uint CharLowerBuffW([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpsz, uint cchLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CharLowerBuffW' -Namespace Win32 -PassThru
# $api::CharLowerBuffW(lpsz, cchLength)

#uselib "USER32.dll"
#func global CharLowerBuffW "CharLowerBuffW" wptr, wptr
; CharLowerBuffW varptr(lpsz), cchLength   ; 戻り値は stat
; lpsz : LPWSTR in/out -> "wptr"
; cchLength : DWORD -> "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 "USER32.dll"
#cfunc global CharLowerBuffW "CharLowerBuffW" var, int
; res = CharLowerBuffW(lpsz, cchLength)
; lpsz : LPWSTR in/out -> "var"
; cchLength : 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。

; DWORD CharLowerBuffW(LPWSTR lpsz, DWORD cchLength)
#uselib "USER32.dll"
#cfunc global CharLowerBuffW "CharLowerBuffW" var, int
; res = CharLowerBuffW(lpsz, cchLength)
; lpsz : LPWSTR in/out -> "var"
; cchLength : 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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCharLowerBuffW = user32.NewProc("CharLowerBuffW")
)

// lpsz (LPWSTR in/out), cchLength (DWORD)
r1, _, err := procCharLowerBuffW.Call(
	uintptr(lpsz),
	uintptr(cchLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function CharLowerBuffW(
  lpsz: PWideChar;   // LPWSTR in/out
  cchLength: DWORD   // DWORD
): DWORD; stdcall;
  external 'USER32.dll' name 'CharLowerBuffW';

result := DllCall("USER32\CharLowerBuffW"
    , "Ptr", lpsz   ; LPWSTR in/out
    , "UInt", cchLength   ; DWORD
    , "UInt")   ; return: DWORD

●CharLowerBuffW(lpsz, cchLength) = DLL("USER32.dll", "dword CharLowerBuffW(char*, dword)")
# 呼び出し: CharLowerBuffW(lpsz, cchLength)
# lpsz : LPWSTR in/out -> "char*"
# cchLength : 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。