CredEnumerateW

// ADVAPI32.dll  (Unicode / -W)
#include <windows.h>

BOOL CredEnumerateW(
    LPCWSTR Filter,   // optional
    CRED_ENUMERATE_FLAGS Flags,   // optional
    DWORD* Count,
    CREDENTIALW*** Credential
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CredEnumerateW(
    <MarshalAs(UnmanagedType.LPWStr)> Filter As String,   ' LPCWSTR optional
    Flags As UInteger,   ' CRED_ENUMERATE_FLAGS optional
    <Out> ByRef Count As UInteger,   ' DWORD* out
    Credential As IntPtr   ' CREDENTIALW*** out
) As Boolean
End Function

' Filter : LPCWSTR optional
' Flags : CRED_ENUMERATE_FLAGS optional
' Count : DWORD* out
' Credential : CREDENTIALW*** out
Declare PtrSafe Function CredEnumerateW Lib "advapi32" ( _
    ByVal Filter As LongPtr, _
    ByVal Flags As Long, _
    ByRef Count As Long, _
    ByVal Credential 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

CredEnumerateW = ctypes.windll.advapi32.CredEnumerateW
CredEnumerateW.restype = wintypes.BOOL
CredEnumerateW.argtypes = [
    wintypes.LPCWSTR,  # Filter : LPCWSTR optional
    wintypes.DWORD,  # Flags : CRED_ENUMERATE_FLAGS optional
    ctypes.POINTER(wintypes.DWORD),  # Count : DWORD* out
    ctypes.c_void_p,  # Credential : CREDENTIALW*** out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
CredEnumerateW = Fiddle::Function.new(
  lib['CredEnumerateW'],
  [
    Fiddle::TYPE_VOIDP,  # Filter : LPCWSTR optional
    -Fiddle::TYPE_INT,  # Flags : CRED_ENUMERATE_FLAGS optional
    Fiddle::TYPE_VOIDP,  # Count : DWORD* out
    Fiddle::TYPE_VOIDP,  # Credential : CREDENTIALW*** out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn CredEnumerateW(
        Filter: *const u16,  // LPCWSTR optional
        Flags: u32,  // CRED_ENUMERATE_FLAGS optional
        Count: *mut u32,  // DWORD* out
        Credential: *mut *mut *mut CREDENTIALW  // CREDENTIALW*** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("ADVAPI32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool CredEnumerateW([MarshalAs(UnmanagedType.LPWStr)] string Filter, uint Flags, out uint Count, IntPtr Credential);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_CredEnumerateW' -Namespace Win32 -PassThru
# $api::CredEnumerateW(Filter, Flags, Count, Credential)

#uselib "ADVAPI32.dll"
#func global CredEnumerateW "CredEnumerateW" wptr, wptr, wptr, wptr
; CredEnumerateW Filter, Flags, varptr(Count), varptr(Credential)   ; 戻り値は stat
; Filter : LPCWSTR optional -> "wptr"
; Flags : CRED_ENUMERATE_FLAGS optional -> "wptr"
; Count : DWORD* out -> "wptr"
; Credential : CREDENTIALW*** 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 "ADVAPI32.dll"
#cfunc global CredEnumerateW "CredEnumerateW" wstr, int, var, var
; res = CredEnumerateW(Filter, Flags, Count, Credential)
; Filter : LPCWSTR optional -> "wstr"
; Flags : CRED_ENUMERATE_FLAGS optional -> "int"
; Count : DWORD* out -> "var"
; Credential : CREDENTIALW*** 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。

; BOOL CredEnumerateW(LPCWSTR Filter, CRED_ENUMERATE_FLAGS Flags, DWORD* Count, CREDENTIALW*** Credential)
#uselib "ADVAPI32.dll"
#cfunc global CredEnumerateW "CredEnumerateW" wstr, int, var, var
; res = CredEnumerateW(Filter, Flags, Count, Credential)
; Filter : LPCWSTR optional -> "wstr"
; Flags : CRED_ENUMERATE_FLAGS optional -> "int"
; Count : DWORD* out -> "var"
; Credential : CREDENTIALW*** 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 (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procCredEnumerateW = advapi32.NewProc("CredEnumerateW")
)

// Filter (LPCWSTR optional), Flags (CRED_ENUMERATE_FLAGS optional), Count (DWORD* out), Credential (CREDENTIALW*** out)
r1, _, err := procCredEnumerateW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(Filter))),
	uintptr(Flags),
	uintptr(Count),
	uintptr(Credential),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CredEnumerateW(
  Filter: PWideChar;   // LPCWSTR optional
  Flags: DWORD;   // CRED_ENUMERATE_FLAGS optional
  Count: Pointer;   // DWORD* out
  Credential: Pointer   // CREDENTIALW*** out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredEnumerateW';

result := DllCall("ADVAPI32\CredEnumerateW"
    , "WStr", Filter   ; LPCWSTR optional
    , "UInt", Flags   ; CRED_ENUMERATE_FLAGS optional
    , "Ptr", Count   ; DWORD* out
    , "Ptr", Credential   ; CREDENTIALW*** out
    , "Int")   ; return: BOOL

●CredEnumerateW(Filter, Flags, Count, Credential) = DLL("ADVAPI32.dll", "bool CredEnumerateW(char*, dword, void*, void*)")
# 呼び出し: CredEnumerateW(Filter, Flags, Count, Credential)
# Filter : LPCWSTR optional -> "char*"
# Flags : CRED_ENUMERATE_FLAGS optional -> "dword"
# Count : DWORD* out -> "void*"
# Credential : CREDENTIALW*** 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。