RasGetCredentialsW

// RASAPI32.dll  (Unicode / -W)
#include <windows.h>

DWORD RasGetCredentialsW(
    LPCWSTR param0,   // optional
    LPCWSTR param1,
    RASCREDENTIALSW* param2
);

<DllImport("RASAPI32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function RasGetCredentialsW(
    <MarshalAs(UnmanagedType.LPWStr)> param0 As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> param1 As String,   ' LPCWSTR
    param2 As IntPtr   ' RASCREDENTIALSW* in/out
) As UInteger
End Function

' param0 : LPCWSTR optional
' param1 : LPCWSTR
' param2 : RASCREDENTIALSW* in/out
Declare PtrSafe Function RasGetCredentialsW Lib "rasapi32" ( _
    ByVal param0 As LongPtr, _
    ByVal param1 As LongPtr, _
    ByVal param2 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

RasGetCredentialsW = ctypes.windll.rasapi32.RasGetCredentialsW
RasGetCredentialsW.restype = wintypes.DWORD
RasGetCredentialsW.argtypes = [
    wintypes.LPCWSTR,  # param0 : LPCWSTR optional
    wintypes.LPCWSTR,  # param1 : LPCWSTR
    ctypes.c_void_p,  # param2 : RASCREDENTIALSW* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('RASAPI32.dll')
RasGetCredentialsW = Fiddle::Function.new(
  lib['RasGetCredentialsW'],
  [
    Fiddle::TYPE_VOIDP,  # param0 : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # param1 : LPCWSTR
    Fiddle::TYPE_VOIDP,  # param2 : RASCREDENTIALSW* in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "rasapi32")]
extern "system" {
    fn RasGetCredentialsW(
        param0: *const u16,  // LPCWSTR optional
        param1: *const u16,  // LPCWSTR
        param2: *mut RASCREDENTIALSW  // RASCREDENTIALSW* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("RASAPI32.dll", CharSet = CharSet.Unicode)]
public static extern uint RasGetCredentialsW([MarshalAs(UnmanagedType.LPWStr)] string param0, [MarshalAs(UnmanagedType.LPWStr)] string param1, IntPtr param2);
"@
$api = Add-Type -MemberDefinition $sig -Name 'RASAPI32_RasGetCredentialsW' -Namespace Win32 -PassThru
# $api::RasGetCredentialsW(param0, param1, param2)

#uselib "RASAPI32.dll"
#func global RasGetCredentialsW "RasGetCredentialsW" wptr, wptr, wptr
; RasGetCredentialsW param0, param1, varptr(param2)   ; 戻り値は stat
; param0 : LPCWSTR optional -> "wptr"
; param1 : LPCWSTR -> "wptr"
; param2 : RASCREDENTIALSW* in/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 "RASAPI32.dll"
#cfunc global RasGetCredentialsW "RasGetCredentialsW" wstr, wstr, var
; res = RasGetCredentialsW(param0, param1, param2)
; param0 : LPCWSTR optional -> "wstr"
; param1 : LPCWSTR -> "wstr"
; param2 : RASCREDENTIALSW* in/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。

; DWORD RasGetCredentialsW(LPCWSTR param0, LPCWSTR param1, RASCREDENTIALSW* param2)
#uselib "RASAPI32.dll"
#cfunc global RasGetCredentialsW "RasGetCredentialsW" wstr, wstr, var
; res = RasGetCredentialsW(param0, param1, param2)
; param0 : LPCWSTR optional -> "wstr"
; param1 : LPCWSTR -> "wstr"
; param2 : RASCREDENTIALSW* in/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 (
	rasapi32 = windows.NewLazySystemDLL("RASAPI32.dll")
	procRasGetCredentialsW = rasapi32.NewProc("RasGetCredentialsW")
)

// param0 (LPCWSTR optional), param1 (LPCWSTR), param2 (RASCREDENTIALSW* in/out)
r1, _, err := procRasGetCredentialsW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(param0))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(param1))),
	uintptr(param2),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function RasGetCredentialsW(
  param0: PWideChar;   // LPCWSTR optional
  param1: PWideChar;   // LPCWSTR
  param2: Pointer   // RASCREDENTIALSW* in/out
): DWORD; stdcall;
  external 'RASAPI32.dll' name 'RasGetCredentialsW';

result := DllCall("RASAPI32\RasGetCredentialsW"
    , "WStr", param0   ; LPCWSTR optional
    , "WStr", param1   ; LPCWSTR
    , "Ptr", param2   ; RASCREDENTIALSW* in/out
    , "UInt")   ; return: DWORD

●RasGetCredentialsW(param0, param1, param2) = DLL("RASAPI32.dll", "dword RasGetCredentialsW(char*, char*, void*)")
# 呼び出し: RasGetCredentialsW(param0, param1, param2)
# param0 : LPCWSTR optional -> "char*"
# param1 : LPCWSTR -> "char*"
# param2 : RASCREDENTIALSW* in/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。