CredIsProtectedW

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

BOOL CredIsProtectedW(
    LPWSTR pszProtectedCredentials,
    CRED_PROTECTION_TYPE* pProtectionType
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CredIsProtectedW(
    <MarshalAs(UnmanagedType.LPWStr)> pszProtectedCredentials As String,   ' LPWSTR
    <Out> ByRef pProtectionType As Integer   ' CRED_PROTECTION_TYPE* out
) As Boolean
End Function

' pszProtectedCredentials : LPWSTR
' pProtectionType : CRED_PROTECTION_TYPE* out
Declare PtrSafe Function CredIsProtectedW Lib "advapi32" ( _
    ByVal pszProtectedCredentials As LongPtr, _
    ByRef pProtectionType 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

CredIsProtectedW = ctypes.windll.advapi32.CredIsProtectedW
CredIsProtectedW.restype = wintypes.BOOL
CredIsProtectedW.argtypes = [
    wintypes.LPCWSTR,  # pszProtectedCredentials : LPWSTR
    ctypes.c_void_p,  # pProtectionType : CRED_PROTECTION_TYPE* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
CredIsProtectedW = Fiddle::Function.new(
  lib['CredIsProtectedW'],
  [
    Fiddle::TYPE_VOIDP,  # pszProtectedCredentials : LPWSTR
    Fiddle::TYPE_VOIDP,  # pProtectionType : CRED_PROTECTION_TYPE* out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn CredIsProtectedW(
        pszProtectedCredentials: *mut u16,  // LPWSTR
        pProtectionType: *mut i32  // CRED_PROTECTION_TYPE* 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 CredIsProtectedW([MarshalAs(UnmanagedType.LPWStr)] string pszProtectedCredentials, out int pProtectionType);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_CredIsProtectedW' -Namespace Win32 -PassThru
# $api::CredIsProtectedW(pszProtectedCredentials, pProtectionType)

#uselib "ADVAPI32.dll"
#func global CredIsProtectedW "CredIsProtectedW" wptr, wptr
; CredIsProtectedW pszProtectedCredentials, pProtectionType   ; 戻り値は stat
; pszProtectedCredentials : LPWSTR -> "wptr"
; pProtectionType : CRED_PROTECTION_TYPE* 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 CredIsProtectedW "CredIsProtectedW" wstr, int
; res = CredIsProtectedW(pszProtectedCredentials, pProtectionType)
; pszProtectedCredentials : LPWSTR -> "wstr"
; pProtectionType : CRED_PROTECTION_TYPE* out -> "int"

; BOOL CredIsProtectedW(LPWSTR pszProtectedCredentials, CRED_PROTECTION_TYPE* pProtectionType)
#uselib "ADVAPI32.dll"
#cfunc global CredIsProtectedW "CredIsProtectedW" wstr, int
; res = CredIsProtectedW(pszProtectedCredentials, pProtectionType)
; pszProtectedCredentials : LPWSTR -> "wstr"
; pProtectionType : CRED_PROTECTION_TYPE* out -> "int"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procCredIsProtectedW = advapi32.NewProc("CredIsProtectedW")
)

// pszProtectedCredentials (LPWSTR), pProtectionType (CRED_PROTECTION_TYPE* out)
r1, _, err := procCredIsProtectedW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszProtectedCredentials))),
	uintptr(pProtectionType),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CredIsProtectedW(
  pszProtectedCredentials: PWideChar;   // LPWSTR
  pProtectionType: Pointer   // CRED_PROTECTION_TYPE* out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredIsProtectedW';

result := DllCall("ADVAPI32\CredIsProtectedW"
    , "WStr", pszProtectedCredentials   ; LPWSTR
    , "Ptr", pProtectionType   ; CRED_PROTECTION_TYPE* out
    , "Int")   ; return: BOOL

●CredIsProtectedW(pszProtectedCredentials, pProtectionType) = DLL("ADVAPI32.dll", "bool CredIsProtectedW(char*, void*)")
# 呼び出し: CredIsProtectedW(pszProtectedCredentials, pProtectionType)
# pszProtectedCredentials : LPWSTR -> "char*"
# pProtectionType : CRED_PROTECTION_TYPE* 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。