CredMarshalCredentialW

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

BOOL CredMarshalCredentialW(
    CRED_MARSHAL_TYPE CredType,
    void* Credential,
    LPWSTR* MarshaledCredential
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CredMarshalCredentialW(
    CredType As Integer,   ' CRED_MARSHAL_TYPE
    Credential As IntPtr,   ' void*
    MarshaledCredential As IntPtr   ' LPWSTR* out
) As Boolean
End Function

' CredType : CRED_MARSHAL_TYPE
' Credential : void*
' MarshaledCredential : LPWSTR* out
Declare PtrSafe Function CredMarshalCredentialW Lib "advapi32" ( _
    ByVal CredType As Long, _
    ByVal Credential As LongPtr, _
    ByVal MarshaledCredential 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

CredMarshalCredentialW = ctypes.windll.advapi32.CredMarshalCredentialW
CredMarshalCredentialW.restype = wintypes.BOOL
CredMarshalCredentialW.argtypes = [
    ctypes.c_int,  # CredType : CRED_MARSHAL_TYPE
    ctypes.POINTER(None),  # Credential : void*
    ctypes.c_void_p,  # MarshaledCredential : LPWSTR* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
CredMarshalCredentialW = Fiddle::Function.new(
  lib['CredMarshalCredentialW'],
  [
    Fiddle::TYPE_INT,  # CredType : CRED_MARSHAL_TYPE
    Fiddle::TYPE_VOIDP,  # Credential : void*
    Fiddle::TYPE_VOIDP,  # MarshaledCredential : LPWSTR* out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn CredMarshalCredentialW(
        CredType: i32,  // CRED_MARSHAL_TYPE
        Credential: *mut (),  // void*
        MarshaledCredential: *mut *mut u16  // LPWSTR* 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 CredMarshalCredentialW(int CredType, IntPtr Credential, IntPtr MarshaledCredential);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_CredMarshalCredentialW' -Namespace Win32 -PassThru
# $api::CredMarshalCredentialW(CredType, Credential, MarshaledCredential)

#uselib "ADVAPI32.dll"
#func global CredMarshalCredentialW "CredMarshalCredentialW" wptr, wptr, wptr
; CredMarshalCredentialW CredType, Credential, varptr(MarshaledCredential)   ; 戻り値は stat
; CredType : CRED_MARSHAL_TYPE -> "wptr"
; Credential : void* -> "wptr"
; MarshaledCredential : LPWSTR* 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 CredMarshalCredentialW "CredMarshalCredentialW" int, sptr, var
; res = CredMarshalCredentialW(CredType, Credential, MarshaledCredential)
; CredType : CRED_MARSHAL_TYPE -> "int"
; Credential : void* -> "sptr"
; MarshaledCredential : LPWSTR* 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 CredMarshalCredentialW(CRED_MARSHAL_TYPE CredType, void* Credential, LPWSTR* MarshaledCredential)
#uselib "ADVAPI32.dll"
#cfunc global CredMarshalCredentialW "CredMarshalCredentialW" int, intptr, var
; res = CredMarshalCredentialW(CredType, Credential, MarshaledCredential)
; CredType : CRED_MARSHAL_TYPE -> "int"
; Credential : void* -> "intptr"
; MarshaledCredential : LPWSTR* 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")
	procCredMarshalCredentialW = advapi32.NewProc("CredMarshalCredentialW")
)

// CredType (CRED_MARSHAL_TYPE), Credential (void*), MarshaledCredential (LPWSTR* out)
r1, _, err := procCredMarshalCredentialW.Call(
	uintptr(CredType),
	uintptr(Credential),
	uintptr(MarshaledCredential),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CredMarshalCredentialW(
  CredType: Integer;   // CRED_MARSHAL_TYPE
  Credential: Pointer;   // void*
  MarshaledCredential: PPWideChar   // LPWSTR* out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredMarshalCredentialW';

result := DllCall("ADVAPI32\CredMarshalCredentialW"
    , "Int", CredType   ; CRED_MARSHAL_TYPE
    , "Ptr", Credential   ; void*
    , "Ptr", MarshaledCredential   ; LPWSTR* out
    , "Int")   ; return: BOOL

●CredMarshalCredentialW(CredType, Credential, MarshaledCredential) = DLL("ADVAPI32.dll", "bool CredMarshalCredentialW(int, void*, void*)")
# 呼び出し: CredMarshalCredentialW(CredType, Credential, MarshaledCredential)
# CredType : CRED_MARSHAL_TYPE -> "int"
# Credential : void* -> "void*"
# MarshaledCredential : LPWSTR* 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。