DavGetTheLockOwnerOfTheFile

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

DWORD DavGetTheLockOwnerOfTheFile(
    LPCWSTR FileName,
    LPWSTR LockOwnerName,   // optional
    DWORD* LockOwnerNameLengthInBytes
);

<DllImport("davclnt.dll", ExactSpelling:=True)>
Public Shared Function DavGetTheLockOwnerOfTheFile(
    <MarshalAs(UnmanagedType.LPWStr)> FileName As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> LockOwnerName As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef LockOwnerNameLengthInBytes As UInteger   ' DWORD* in/out
) As UInteger
End Function

' FileName : LPCWSTR
' LockOwnerName : LPWSTR optional, out
' LockOwnerNameLengthInBytes : DWORD* in/out
Declare PtrSafe Function DavGetTheLockOwnerOfTheFile Lib "davclnt" ( _
    ByVal FileName As LongPtr, _
    ByVal LockOwnerName As LongPtr, _
    ByRef LockOwnerNameLengthInBytes As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DavGetTheLockOwnerOfTheFile = ctypes.windll.davclnt.DavGetTheLockOwnerOfTheFile
DavGetTheLockOwnerOfTheFile.restype = wintypes.DWORD
DavGetTheLockOwnerOfTheFile.argtypes = [
    wintypes.LPCWSTR,  # FileName : LPCWSTR
    wintypes.LPWSTR,  # LockOwnerName : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # LockOwnerNameLengthInBytes : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('davclnt.dll')
DavGetTheLockOwnerOfTheFile = Fiddle::Function.new(
  lib['DavGetTheLockOwnerOfTheFile'],
  [
    Fiddle::TYPE_VOIDP,  # FileName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # LockOwnerName : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # LockOwnerNameLengthInBytes : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "davclnt")]
extern "system" {
    fn DavGetTheLockOwnerOfTheFile(
        FileName: *const u16,  // LPCWSTR
        LockOwnerName: *mut u16,  // LPWSTR optional, out
        LockOwnerNameLengthInBytes: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("davclnt.dll")]
public static extern uint DavGetTheLockOwnerOfTheFile([MarshalAs(UnmanagedType.LPWStr)] string FileName, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder LockOwnerName, ref uint LockOwnerNameLengthInBytes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'davclnt_DavGetTheLockOwnerOfTheFile' -Namespace Win32 -PassThru
# $api::DavGetTheLockOwnerOfTheFile(FileName, LockOwnerName, LockOwnerNameLengthInBytes)

#uselib "davclnt.dll"
#func global DavGetTheLockOwnerOfTheFile "DavGetTheLockOwnerOfTheFile" sptr, sptr, sptr
; DavGetTheLockOwnerOfTheFile FileName, varptr(LockOwnerName), varptr(LockOwnerNameLengthInBytes)   ; 戻り値は stat
; FileName : LPCWSTR -> "sptr"
; LockOwnerName : LPWSTR optional, out -> "sptr"
; LockOwnerNameLengthInBytes : DWORD* in/out -> "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 "davclnt.dll"
#cfunc global DavGetTheLockOwnerOfTheFile "DavGetTheLockOwnerOfTheFile" wstr, var, var
; res = DavGetTheLockOwnerOfTheFile(FileName, LockOwnerName, LockOwnerNameLengthInBytes)
; FileName : LPCWSTR -> "wstr"
; LockOwnerName : LPWSTR optional, out -> "var"
; LockOwnerNameLengthInBytes : DWORD* in/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 DavGetTheLockOwnerOfTheFile(LPCWSTR FileName, LPWSTR LockOwnerName, DWORD* LockOwnerNameLengthInBytes)
#uselib "davclnt.dll"
#cfunc global DavGetTheLockOwnerOfTheFile "DavGetTheLockOwnerOfTheFile" wstr, var, var
; res = DavGetTheLockOwnerOfTheFile(FileName, LockOwnerName, LockOwnerNameLengthInBytes)
; FileName : LPCWSTR -> "wstr"
; LockOwnerName : LPWSTR optional, out -> "var"
; LockOwnerNameLengthInBytes : DWORD* in/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 (
	davclnt = windows.NewLazySystemDLL("davclnt.dll")
	procDavGetTheLockOwnerOfTheFile = davclnt.NewProc("DavGetTheLockOwnerOfTheFile")
)

// FileName (LPCWSTR), LockOwnerName (LPWSTR optional, out), LockOwnerNameLengthInBytes (DWORD* in/out)
r1, _, err := procDavGetTheLockOwnerOfTheFile.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(FileName))),
	uintptr(LockOwnerName),
	uintptr(LockOwnerNameLengthInBytes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DavGetTheLockOwnerOfTheFile(
  FileName: PWideChar;   // LPCWSTR
  LockOwnerName: PWideChar;   // LPWSTR optional, out
  LockOwnerNameLengthInBytes: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'davclnt.dll' name 'DavGetTheLockOwnerOfTheFile';

result := DllCall("davclnt\DavGetTheLockOwnerOfTheFile"
    , "WStr", FileName   ; LPCWSTR
    , "Ptr", LockOwnerName   ; LPWSTR optional, out
    , "Ptr", LockOwnerNameLengthInBytes   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●DavGetTheLockOwnerOfTheFile(FileName, LockOwnerName, LockOwnerNameLengthInBytes) = DLL("davclnt.dll", "dword DavGetTheLockOwnerOfTheFile(char*, char*, void*)")
# 呼び出し: DavGetTheLockOwnerOfTheFile(FileName, LockOwnerName, LockOwnerNameLengthInBytes)
# FileName : LPCWSTR -> "char*"
# LockOwnerName : LPWSTR optional, out -> "char*"
# LockOwnerNameLengthInBytes : DWORD* in/out -> "void*"
# 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)。