CredEnumerateA

// ADVAPI32.dll  (ANSI / -A)
#include <windows.h>

BOOL CredEnumerateA(
    LPCSTR Filter,   // optional
    CRED_ENUMERATE_FLAGS Flags,   // optional
    DWORD* Count,
    CREDENTIALA*** Credential
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CredEnumerateA(
    <MarshalAs(UnmanagedType.LPStr)> Filter As String,   ' LPCSTR optional
    Flags As UInteger,   ' CRED_ENUMERATE_FLAGS optional
    <Out> ByRef Count As UInteger,   ' DWORD* out
    Credential As IntPtr   ' CREDENTIALA*** out
) As Boolean
End Function

' Filter : LPCSTR optional
' Flags : CRED_ENUMERATE_FLAGS optional
' Count : DWORD* out
' Credential : CREDENTIALA*** out
Declare PtrSafe Function CredEnumerateA Lib "advapi32" ( _
    ByVal Filter As String, _
    ByVal Flags As Long, _
    ByRef Count As Long, _
    ByVal Credential As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
CredEnumerateA = Fiddle::Function.new(
  lib['CredEnumerateA'],
  [
    Fiddle::TYPE_VOIDP,  # Filter : LPCSTR optional
    -Fiddle::TYPE_INT,  # Flags : CRED_ENUMERATE_FLAGS optional
    Fiddle::TYPE_VOIDP,  # Count : DWORD* out
    Fiddle::TYPE_VOIDP,  # Credential : CREDENTIALA*** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "advapi32")]
extern "system" {
    fn CredEnumerateA(
        Filter: *const u8,  // LPCSTR optional
        Flags: u32,  // CRED_ENUMERATE_FLAGS optional
        Count: *mut u32,  // DWORD* out
        Credential: *mut *mut *mut CREDENTIALA  // CREDENTIALA*** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool CredEnumerateA([MarshalAs(UnmanagedType.LPStr)] string Filter, uint Flags, out uint Count, IntPtr Credential);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_CredEnumerateA' -Namespace Win32 -PassThru
# $api::CredEnumerateA(Filter, Flags, Count, Credential)

#uselib "ADVAPI32.dll"
#func global CredEnumerateA "CredEnumerateA" sptr, sptr, sptr, sptr
; CredEnumerateA Filter, Flags, varptr(Count), varptr(Credential)   ; 戻り値は stat
; Filter : LPCSTR optional -> "sptr"
; Flags : CRED_ENUMERATE_FLAGS optional -> "sptr"
; Count : DWORD* out -> "sptr"
; Credential : CREDENTIALA*** 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 "ADVAPI32.dll"
#cfunc global CredEnumerateA "CredEnumerateA" str, int, var, var
; res = CredEnumerateA(Filter, Flags, Count, Credential)
; Filter : LPCSTR optional -> "str"
; Flags : CRED_ENUMERATE_FLAGS optional -> "int"
; Count : DWORD* out -> "var"
; Credential : CREDENTIALA*** 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 CredEnumerateA(LPCSTR Filter, CRED_ENUMERATE_FLAGS Flags, DWORD* Count, CREDENTIALA*** Credential)
#uselib "ADVAPI32.dll"
#cfunc global CredEnumerateA "CredEnumerateA" str, int, var, var
; res = CredEnumerateA(Filter, Flags, Count, Credential)
; Filter : LPCSTR optional -> "str"
; Flags : CRED_ENUMERATE_FLAGS optional -> "int"
; Count : DWORD* out -> "var"
; Credential : CREDENTIALA*** 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")
	procCredEnumerateA = advapi32.NewProc("CredEnumerateA")
)

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

function CredEnumerateA(
  Filter: PAnsiChar;   // LPCSTR optional
  Flags: DWORD;   // CRED_ENUMERATE_FLAGS optional
  Count: Pointer;   // DWORD* out
  Credential: Pointer   // CREDENTIALA*** out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredEnumerateA';

result := DllCall("ADVAPI32\CredEnumerateA"
    , "AStr", Filter   ; LPCSTR optional
    , "UInt", Flags   ; CRED_ENUMERATE_FLAGS optional
    , "Ptr", Count   ; DWORD* out
    , "Ptr", Credential   ; CREDENTIALA*** out
    , "Int")   ; return: BOOL

●CredEnumerateA(Filter, Flags, Count, Credential) = DLL("ADVAPI32.dll", "bool CredEnumerateA(char*, dword, void*, void*)")
# 呼び出し: CredEnumerateA(Filter, Flags, Count, Credential)
# Filter : LPCSTR optional -> "char*"
# Flags : CRED_ENUMERATE_FLAGS optional -> "dword"
# Count : DWORD* out -> "void*"
# Credential : CREDENTIALA*** 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)。