CredUIReadSSOCredW

// credui.dll
#include <windows.h>

DWORD CredUIReadSSOCredW(
    LPCWSTR pszRealm,   // optional
    LPWSTR* ppszUsername
);

<DllImport("credui.dll", ExactSpelling:=True)>
Public Shared Function CredUIReadSSOCredW(
    <MarshalAs(UnmanagedType.LPWStr)> pszRealm As String,   ' LPCWSTR optional
    ppszUsername As IntPtr   ' LPWSTR* out
) As UInteger
End Function

' pszRealm : LPCWSTR optional
' ppszUsername : LPWSTR* out
Declare PtrSafe Function CredUIReadSSOCredW Lib "credui" ( _
    ByVal pszRealm As LongPtr, _
    ByVal ppszUsername 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

CredUIReadSSOCredW = ctypes.windll.credui.CredUIReadSSOCredW
CredUIReadSSOCredW.restype = wintypes.DWORD
CredUIReadSSOCredW.argtypes = [
    wintypes.LPCWSTR,  # pszRealm : LPCWSTR optional
    ctypes.c_void_p,  # ppszUsername : LPWSTR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('credui.dll')
CredUIReadSSOCredW = Fiddle::Function.new(
  lib['CredUIReadSSOCredW'],
  [
    Fiddle::TYPE_VOIDP,  # pszRealm : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # ppszUsername : LPWSTR* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "credui")]
extern "system" {
    fn CredUIReadSSOCredW(
        pszRealm: *const u16,  // LPCWSTR optional
        ppszUsername: *mut *mut u16  // LPWSTR* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("credui.dll")]
public static extern uint CredUIReadSSOCredW([MarshalAs(UnmanagedType.LPWStr)] string pszRealm, IntPtr ppszUsername);
"@
$api = Add-Type -MemberDefinition $sig -Name 'credui_CredUIReadSSOCredW' -Namespace Win32 -PassThru
# $api::CredUIReadSSOCredW(pszRealm, ppszUsername)

#uselib "credui.dll"
#func global CredUIReadSSOCredW "CredUIReadSSOCredW" sptr, sptr
; CredUIReadSSOCredW pszRealm, varptr(ppszUsername)   ; 戻り値は stat
; pszRealm : LPCWSTR optional -> "sptr"
; ppszUsername : LPWSTR* 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 "credui.dll"
#cfunc global CredUIReadSSOCredW "CredUIReadSSOCredW" wstr, var
; res = CredUIReadSSOCredW(pszRealm, ppszUsername)
; pszRealm : LPCWSTR optional -> "wstr"
; ppszUsername : 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。

; DWORD CredUIReadSSOCredW(LPCWSTR pszRealm, LPWSTR* ppszUsername)
#uselib "credui.dll"
#cfunc global CredUIReadSSOCredW "CredUIReadSSOCredW" wstr, var
; res = CredUIReadSSOCredW(pszRealm, ppszUsername)
; pszRealm : LPCWSTR optional -> "wstr"
; ppszUsername : 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 (
	credui = windows.NewLazySystemDLL("credui.dll")
	procCredUIReadSSOCredW = credui.NewProc("CredUIReadSSOCredW")
)

// pszRealm (LPCWSTR optional), ppszUsername (LPWSTR* out)
r1, _, err := procCredUIReadSSOCredW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszRealm))),
	uintptr(ppszUsername),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function CredUIReadSSOCredW(
  pszRealm: PWideChar;   // LPCWSTR optional
  ppszUsername: PPWideChar   // LPWSTR* out
): DWORD; stdcall;
  external 'credui.dll' name 'CredUIReadSSOCredW';

result := DllCall("credui\CredUIReadSSOCredW"
    , "WStr", pszRealm   ; LPCWSTR optional
    , "Ptr", ppszUsername   ; LPWSTR* out
    , "UInt")   ; return: DWORD

●CredUIReadSSOCredW(pszRealm, ppszUsername) = DLL("credui.dll", "dword CredUIReadSSOCredW(char*, void*)")
# 呼び出し: CredUIReadSSOCredW(pszRealm, ppszUsername)
# pszRealm : LPCWSTR optional -> "char*"
# ppszUsername : 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)。