CredUIParseUserNameW

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

WIN32_ERROR CredUIParseUserNameW(
    LPCWSTR UserName,
    LPWSTR user,
    DWORD userBufferSize,
    LPWSTR domain,
    DWORD domainBufferSize
);

<DllImport("credui.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function CredUIParseUserNameW(
    <MarshalAs(UnmanagedType.LPWStr)> UserName As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> user As System.Text.StringBuilder,   ' LPWSTR out
    userBufferSize As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> domain As System.Text.StringBuilder,   ' LPWSTR out
    domainBufferSize As UInteger   ' DWORD
) As UInteger
End Function

' UserName : LPCWSTR
' user : LPWSTR out
' userBufferSize : DWORD
' domain : LPWSTR out
' domainBufferSize : DWORD
Declare PtrSafe Function CredUIParseUserNameW Lib "credui" ( _
    ByVal UserName As LongPtr, _
    ByVal user As LongPtr, _
    ByVal userBufferSize As Long, _
    ByVal domain As LongPtr, _
    ByVal domainBufferSize 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

CredUIParseUserNameW = ctypes.windll.credui.CredUIParseUserNameW
CredUIParseUserNameW.restype = wintypes.DWORD
CredUIParseUserNameW.argtypes = [
    wintypes.LPCWSTR,  # UserName : LPCWSTR
    wintypes.LPWSTR,  # user : LPWSTR out
    wintypes.DWORD,  # userBufferSize : DWORD
    wintypes.LPWSTR,  # domain : LPWSTR out
    wintypes.DWORD,  # domainBufferSize : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('credui.dll')
CredUIParseUserNameW = Fiddle::Function.new(
  lib['CredUIParseUserNameW'],
  [
    Fiddle::TYPE_VOIDP,  # UserName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # user : LPWSTR out
    -Fiddle::TYPE_INT,  # userBufferSize : DWORD
    Fiddle::TYPE_VOIDP,  # domain : LPWSTR out
    -Fiddle::TYPE_INT,  # domainBufferSize : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "credui")]
extern "system" {
    fn CredUIParseUserNameW(
        UserName: *const u16,  // LPCWSTR
        user: *mut u16,  // LPWSTR out
        userBufferSize: u32,  // DWORD
        domain: *mut u16,  // LPWSTR out
        domainBufferSize: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("credui.dll", CharSet = CharSet.Unicode)]
public static extern uint CredUIParseUserNameW([MarshalAs(UnmanagedType.LPWStr)] string UserName, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder user, uint userBufferSize, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder domain, uint domainBufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'credui_CredUIParseUserNameW' -Namespace Win32 -PassThru
# $api::CredUIParseUserNameW(UserName, user, userBufferSize, domain, domainBufferSize)

#uselib "credui.dll"
#func global CredUIParseUserNameW "CredUIParseUserNameW" wptr, wptr, wptr, wptr, wptr
; CredUIParseUserNameW UserName, varptr(user), userBufferSize, varptr(domain), domainBufferSize   ; 戻り値は stat
; UserName : LPCWSTR -> "wptr"
; user : LPWSTR out -> "wptr"
; userBufferSize : DWORD -> "wptr"
; domain : LPWSTR out -> "wptr"
; domainBufferSize : 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 "credui.dll"
#cfunc global CredUIParseUserNameW "CredUIParseUserNameW" wstr, var, int, var, int
; res = CredUIParseUserNameW(UserName, user, userBufferSize, domain, domainBufferSize)
; UserName : LPCWSTR -> "wstr"
; user : LPWSTR out -> "var"
; userBufferSize : DWORD -> "int"
; domain : LPWSTR out -> "var"
; domainBufferSize : 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。

; WIN32_ERROR CredUIParseUserNameW(LPCWSTR UserName, LPWSTR user, DWORD userBufferSize, LPWSTR domain, DWORD domainBufferSize)
#uselib "credui.dll"
#cfunc global CredUIParseUserNameW "CredUIParseUserNameW" wstr, var, int, var, int
; res = CredUIParseUserNameW(UserName, user, userBufferSize, domain, domainBufferSize)
; UserName : LPCWSTR -> "wstr"
; user : LPWSTR out -> "var"
; userBufferSize : DWORD -> "int"
; domain : LPWSTR out -> "var"
; domainBufferSize : 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 (
	credui = windows.NewLazySystemDLL("credui.dll")
	procCredUIParseUserNameW = credui.NewProc("CredUIParseUserNameW")
)

// UserName (LPCWSTR), user (LPWSTR out), userBufferSize (DWORD), domain (LPWSTR out), domainBufferSize (DWORD)
r1, _, err := procCredUIParseUserNameW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(UserName))),
	uintptr(user),
	uintptr(userBufferSize),
	uintptr(domain),
	uintptr(domainBufferSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function CredUIParseUserNameW(
  UserName: PWideChar;   // LPCWSTR
  user: PWideChar;   // LPWSTR out
  userBufferSize: DWORD;   // DWORD
  domain: PWideChar;   // LPWSTR out
  domainBufferSize: DWORD   // DWORD
): DWORD; stdcall;
  external 'credui.dll' name 'CredUIParseUserNameW';

result := DllCall("credui\CredUIParseUserNameW"
    , "WStr", UserName   ; LPCWSTR
    , "Ptr", user   ; LPWSTR out
    , "UInt", userBufferSize   ; DWORD
    , "Ptr", domain   ; LPWSTR out
    , "UInt", domainBufferSize   ; DWORD
    , "UInt")   ; return: WIN32_ERROR

●CredUIParseUserNameW(UserName, user, userBufferSize, domain, domainBufferSize) = DLL("credui.dll", "dword CredUIParseUserNameW(char*, char*, dword, char*, dword)")
# 呼び出し: CredUIParseUserNameW(UserName, user, userBufferSize, domain, domainBufferSize)
# UserName : LPCWSTR -> "char*"
# user : LPWSTR out -> "char*"
# userBufferSize : DWORD -> "dword"
# domain : LPWSTR out -> "char*"
# domainBufferSize : 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。