CredReadW

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

BOOL CredReadW(
    LPCWSTR TargetName,
    CRED_TYPE Type,
    DWORD Flags,   // optional
    CREDENTIALW** Credential
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CredReadW(
    <MarshalAs(UnmanagedType.LPWStr)> TargetName As String,   ' LPCWSTR
    Type As UInteger,   ' CRED_TYPE
    Flags As UInteger,   ' DWORD optional
    Credential As IntPtr   ' CREDENTIALW** out
) As Boolean
End Function

' TargetName : LPCWSTR
' Type : CRED_TYPE
' Flags : DWORD optional
' Credential : CREDENTIALW** out
Declare PtrSafe Function CredReadW Lib "advapi32" ( _
    ByVal TargetName As LongPtr, _
    ByVal Type As Long, _
    ByVal Flags 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

CredReadW = ctypes.windll.advapi32.CredReadW
CredReadW.restype = wintypes.BOOL
CredReadW.argtypes = [
    wintypes.LPCWSTR,  # TargetName : LPCWSTR
    wintypes.DWORD,  # Type : CRED_TYPE
    wintypes.DWORD,  # Flags : DWORD optional
    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')
CredReadW = Fiddle::Function.new(
  lib['CredReadW'],
  [
    Fiddle::TYPE_VOIDP,  # TargetName : LPCWSTR
    -Fiddle::TYPE_INT,  # Type : CRED_TYPE
    -Fiddle::TYPE_INT,  # Flags : DWORD optional
    Fiddle::TYPE_VOIDP,  # Credential : CREDENTIALW** out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn CredReadW(
        TargetName: *const u16,  // LPCWSTR
        Type: u32,  // CRED_TYPE
        Flags: u32,  // DWORD optional
        Credential: *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 CredReadW([MarshalAs(UnmanagedType.LPWStr)] string TargetName, uint Type, uint Flags, IntPtr Credential);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_CredReadW' -Namespace Win32 -PassThru
# $api::CredReadW(TargetName, Type, Flags, Credential)

#uselib "ADVAPI32.dll"
#func global CredReadW "CredReadW" wptr, wptr, wptr, wptr
; CredReadW TargetName, Type, Flags, varptr(Credential)   ; 戻り値は stat
; TargetName : LPCWSTR -> "wptr"
; Type : CRED_TYPE -> "wptr"
; Flags : DWORD optional -> "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 CredReadW "CredReadW" wstr, int, int, var
; res = CredReadW(TargetName, Type, Flags, Credential)
; TargetName : LPCWSTR -> "wstr"
; Type : CRED_TYPE -> "int"
; Flags : DWORD optional -> "int"
; 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 CredReadW(LPCWSTR TargetName, CRED_TYPE Type, DWORD Flags, CREDENTIALW** Credential)
#uselib "ADVAPI32.dll"
#cfunc global CredReadW "CredReadW" wstr, int, int, var
; res = CredReadW(TargetName, Type, Flags, Credential)
; TargetName : LPCWSTR -> "wstr"
; Type : CRED_TYPE -> "int"
; Flags : DWORD optional -> "int"
; 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")
	procCredReadW = advapi32.NewProc("CredReadW")
)

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

function CredReadW(
  TargetName: PWideChar;   // LPCWSTR
  Type: DWORD;   // CRED_TYPE
  Flags: DWORD;   // DWORD optional
  Credential: Pointer   // CREDENTIALW** out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredReadW';

result := DllCall("ADVAPI32\CredReadW"
    , "WStr", TargetName   ; LPCWSTR
    , "UInt", Type   ; CRED_TYPE
    , "UInt", Flags   ; DWORD optional
    , "Ptr", Credential   ; CREDENTIALW** out
    , "Int")   ; return: BOOL

●CredReadW(TargetName, Type, Flags, Credential) = DLL("ADVAPI32.dll", "bool CredReadW(char*, dword, dword, void*)")
# 呼び出し: CredReadW(TargetName, Type, Flags, Credential)
# TargetName : LPCWSTR -> "char*"
# Type : CRED_TYPE -> "dword"
# Flags : DWORD optional -> "dword"
# 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。