CredUIParseUserNameA

// credui.dll  (ANSI / -A)
#include <windows.h>

WIN32_ERROR CredUIParseUserNameA(
    LPCSTR userName,
    LPSTR user,
    DWORD userBufferSize,
    LPSTR domain,
    DWORD domainBufferSize
);

<DllImport("credui.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function CredUIParseUserNameA(
    <MarshalAs(UnmanagedType.LPStr)> userName As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> user As System.Text.StringBuilder,   ' LPSTR out
    userBufferSize As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> domain As System.Text.StringBuilder,   ' LPSTR out
    domainBufferSize As UInteger   ' DWORD
) As UInteger
End Function

' userName : LPCSTR
' user : LPSTR out
' userBufferSize : DWORD
' domain : LPSTR out
' domainBufferSize : DWORD
Declare PtrSafe Function CredUIParseUserNameA Lib "credui" ( _
    ByVal userName As String, _
    ByVal user As String, _
    ByVal userBufferSize As Long, _
    ByVal domain As String, _
    ByVal domainBufferSize 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

CredUIParseUserNameA = ctypes.windll.credui.CredUIParseUserNameA
CredUIParseUserNameA.restype = wintypes.DWORD
CredUIParseUserNameA.argtypes = [
    wintypes.LPCSTR,  # userName : LPCSTR
    wintypes.LPSTR,  # user : LPSTR out
    wintypes.DWORD,  # userBufferSize : DWORD
    wintypes.LPSTR,  # domain : LPSTR out
    wintypes.DWORD,  # domainBufferSize : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('credui.dll')
CredUIParseUserNameA = Fiddle::Function.new(
  lib['CredUIParseUserNameA'],
  [
    Fiddle::TYPE_VOIDP,  # userName : LPCSTR
    Fiddle::TYPE_VOIDP,  # user : LPSTR out
    -Fiddle::TYPE_INT,  # userBufferSize : DWORD
    Fiddle::TYPE_VOIDP,  # domain : LPSTR out
    -Fiddle::TYPE_INT,  # domainBufferSize : DWORD
  ],
  -Fiddle::TYPE_INT)

#[link(name = "credui")]
extern "system" {
    fn CredUIParseUserNameA(
        userName: *const u8,  // LPCSTR
        user: *mut u8,  // LPSTR out
        userBufferSize: u32,  // DWORD
        domain: *mut u8,  // LPSTR out
        domainBufferSize: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "credui.dll"
#func global CredUIParseUserNameA "CredUIParseUserNameA" sptr, sptr, sptr, sptr, sptr
; CredUIParseUserNameA userName, varptr(user), userBufferSize, varptr(domain), domainBufferSize   ; 戻り値は stat
; userName : LPCSTR -> "sptr"
; user : LPSTR out -> "sptr"
; userBufferSize : DWORD -> "sptr"
; domain : LPSTR out -> "sptr"
; domainBufferSize : DWORD -> "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 "credui.dll"
#cfunc global CredUIParseUserNameA "CredUIParseUserNameA" str, var, int, var, int
; res = CredUIParseUserNameA(userName, user, userBufferSize, domain, domainBufferSize)
; userName : LPCSTR -> "str"
; user : LPSTR out -> "var"
; userBufferSize : DWORD -> "int"
; domain : LPSTR 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 CredUIParseUserNameA(LPCSTR userName, LPSTR user, DWORD userBufferSize, LPSTR domain, DWORD domainBufferSize)
#uselib "credui.dll"
#cfunc global CredUIParseUserNameA "CredUIParseUserNameA" str, var, int, var, int
; res = CredUIParseUserNameA(userName, user, userBufferSize, domain, domainBufferSize)
; userName : LPCSTR -> "str"
; user : LPSTR out -> "var"
; userBufferSize : DWORD -> "int"
; domain : LPSTR 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")
	procCredUIParseUserNameA = credui.NewProc("CredUIParseUserNameA")
)

// userName (LPCSTR), user (LPSTR out), userBufferSize (DWORD), domain (LPSTR out), domainBufferSize (DWORD)
r1, _, err := procCredUIParseUserNameA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(userName))),
	uintptr(user),
	uintptr(userBufferSize),
	uintptr(domain),
	uintptr(domainBufferSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function CredUIParseUserNameA(
  userName: PAnsiChar;   // LPCSTR
  user: PAnsiChar;   // LPSTR out
  userBufferSize: DWORD;   // DWORD
  domain: PAnsiChar;   // LPSTR out
  domainBufferSize: DWORD   // DWORD
): DWORD; stdcall;
  external 'credui.dll' name 'CredUIParseUserNameA';

result := DllCall("credui\CredUIParseUserNameA"
    , "AStr", userName   ; LPCSTR
    , "Ptr", user   ; LPSTR out
    , "UInt", userBufferSize   ; DWORD
    , "Ptr", domain   ; LPSTR out
    , "UInt", domainBufferSize   ; DWORD
    , "UInt")   ; return: WIN32_ERROR

●CredUIParseUserNameA(userName, user, userBufferSize, domain, domainBufferSize) = DLL("credui.dll", "dword CredUIParseUserNameA(char*, char*, dword, char*, dword)")
# 呼び出し: CredUIParseUserNameA(userName, user, userBufferSize, domain, domainBufferSize)
# userName : LPCSTR -> "char*"
# user : LPSTR out -> "char*"
# userBufferSize : DWORD -> "dword"
# domain : LPSTR 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)。