InternetGetCookieExW

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

BOOL InternetGetCookieExW(
    LPCWSTR lpszUrl,
    LPCWSTR lpszCookieName,   // optional
    LPWSTR lpszCookieData,   // optional
    DWORD* lpdwSize,
    INTERNET_COOKIE_FLAGS dwFlags,
    void* lpReserved   // optional
);

<DllImport("WININET.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InternetGetCookieExW(
    <MarshalAs(UnmanagedType.LPWStr)> lpszUrl As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpszCookieName As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> lpszCookieData As String,   ' LPWSTR optional
    ByRef lpdwSize As UInteger,   ' DWORD* in/out
    dwFlags As UInteger,   ' INTERNET_COOKIE_FLAGS
    lpReserved As IntPtr   ' void* optional
) As Boolean
End Function

' lpszUrl : LPCWSTR
' lpszCookieName : LPCWSTR optional
' lpszCookieData : LPWSTR optional
' lpdwSize : DWORD* in/out
' dwFlags : INTERNET_COOKIE_FLAGS
' lpReserved : void* optional
Declare PtrSafe Function InternetGetCookieExW Lib "wininet" ( _
    ByVal lpszUrl As LongPtr, _
    ByVal lpszCookieName As LongPtr, _
    ByVal lpszCookieData As LongPtr, _
    ByRef lpdwSize As Long, _
    ByVal dwFlags As Long, _
    ByVal lpReserved 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

InternetGetCookieExW = ctypes.windll.wininet.InternetGetCookieExW
InternetGetCookieExW.restype = wintypes.BOOL
InternetGetCookieExW.argtypes = [
    wintypes.LPCWSTR,  # lpszUrl : LPCWSTR
    wintypes.LPCWSTR,  # lpszCookieName : LPCWSTR optional
    wintypes.LPCWSTR,  # lpszCookieData : LPWSTR optional
    ctypes.POINTER(wintypes.DWORD),  # lpdwSize : DWORD* in/out
    wintypes.DWORD,  # dwFlags : INTERNET_COOKIE_FLAGS
    ctypes.POINTER(None),  # lpReserved : void* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
InternetGetCookieExW = Fiddle::Function.new(
  lib['InternetGetCookieExW'],
  [
    Fiddle::TYPE_VOIDP,  # lpszUrl : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpszCookieName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # lpszCookieData : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # lpdwSize : DWORD* in/out
    -Fiddle::TYPE_INT,  # dwFlags : INTERNET_COOKIE_FLAGS
    Fiddle::TYPE_VOIDP,  # lpReserved : void* optional
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "wininet")]
extern "system" {
    fn InternetGetCookieExW(
        lpszUrl: *const u16,  // LPCWSTR
        lpszCookieName: *const u16,  // LPCWSTR optional
        lpszCookieData: *mut u16,  // LPWSTR optional
        lpdwSize: *mut u32,  // DWORD* in/out
        dwFlags: u32,  // INTERNET_COOKIE_FLAGS
        lpReserved: *mut ()  // void* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WININET.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool InternetGetCookieExW([MarshalAs(UnmanagedType.LPWStr)] string lpszUrl, [MarshalAs(UnmanagedType.LPWStr)] string lpszCookieName, [MarshalAs(UnmanagedType.LPWStr)] string lpszCookieData, ref uint lpdwSize, uint dwFlags, IntPtr lpReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetGetCookieExW' -Namespace Win32 -PassThru
# $api::InternetGetCookieExW(lpszUrl, lpszCookieName, lpszCookieData, lpdwSize, dwFlags, lpReserved)

#uselib "WININET.dll"
#func global InternetGetCookieExW "InternetGetCookieExW" wptr, wptr, wptr, wptr, wptr, wptr
; InternetGetCookieExW lpszUrl, lpszCookieName, lpszCookieData, varptr(lpdwSize), dwFlags, lpReserved   ; 戻り値は stat
; lpszUrl : LPCWSTR -> "wptr"
; lpszCookieName : LPCWSTR optional -> "wptr"
; lpszCookieData : LPWSTR optional -> "wptr"
; lpdwSize : DWORD* in/out -> "wptr"
; dwFlags : INTERNET_COOKIE_FLAGS -> "wptr"
; lpReserved : void* optional -> "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 "WININET.dll"
#cfunc global InternetGetCookieExW "InternetGetCookieExW" wstr, wstr, wstr, var, int, sptr
; res = InternetGetCookieExW(lpszUrl, lpszCookieName, lpszCookieData, lpdwSize, dwFlags, lpReserved)
; lpszUrl : LPCWSTR -> "wstr"
; lpszCookieName : LPCWSTR optional -> "wstr"
; lpszCookieData : LPWSTR optional -> "wstr"
; lpdwSize : DWORD* in/out -> "var"
; dwFlags : INTERNET_COOKIE_FLAGS -> "int"
; lpReserved : void* optional -> "sptr"
; ※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 InternetGetCookieExW(LPCWSTR lpszUrl, LPCWSTR lpszCookieName, LPWSTR lpszCookieData, DWORD* lpdwSize, INTERNET_COOKIE_FLAGS dwFlags, void* lpReserved)
#uselib "WININET.dll"
#cfunc global InternetGetCookieExW "InternetGetCookieExW" wstr, wstr, wstr, var, int, intptr
; res = InternetGetCookieExW(lpszUrl, lpszCookieName, lpszCookieData, lpdwSize, dwFlags, lpReserved)
; lpszUrl : LPCWSTR -> "wstr"
; lpszCookieName : LPCWSTR optional -> "wstr"
; lpszCookieData : LPWSTR optional -> "wstr"
; lpdwSize : DWORD* in/out -> "var"
; dwFlags : INTERNET_COOKIE_FLAGS -> "int"
; lpReserved : void* optional -> "intptr"
; ※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 (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetGetCookieExW = wininet.NewProc("InternetGetCookieExW")
)

// lpszUrl (LPCWSTR), lpszCookieName (LPCWSTR optional), lpszCookieData (LPWSTR optional), lpdwSize (DWORD* in/out), dwFlags (INTERNET_COOKIE_FLAGS), lpReserved (void* optional)
r1, _, err := procInternetGetCookieExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszUrl))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszCookieName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszCookieData))),
	uintptr(lpdwSize),
	uintptr(dwFlags),
	uintptr(lpReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function InternetGetCookieExW(
  lpszUrl: PWideChar;   // LPCWSTR
  lpszCookieName: PWideChar;   // LPCWSTR optional
  lpszCookieData: PWideChar;   // LPWSTR optional
  lpdwSize: Pointer;   // DWORD* in/out
  dwFlags: DWORD;   // INTERNET_COOKIE_FLAGS
  lpReserved: Pointer   // void* optional
): BOOL; stdcall;
  external 'WININET.dll' name 'InternetGetCookieExW';

result := DllCall("WININET\InternetGetCookieExW"
    , "WStr", lpszUrl   ; LPCWSTR
    , "WStr", lpszCookieName   ; LPCWSTR optional
    , "WStr", lpszCookieData   ; LPWSTR optional
    , "Ptr", lpdwSize   ; DWORD* in/out
    , "UInt", dwFlags   ; INTERNET_COOKIE_FLAGS
    , "Ptr", lpReserved   ; void* optional
    , "Int")   ; return: BOOL

●InternetGetCookieExW(lpszUrl, lpszCookieName, lpszCookieData, lpdwSize, dwFlags, lpReserved) = DLL("WININET.dll", "bool InternetGetCookieExW(char*, char*, char*, void*, dword, void*)")
# 呼び出し: InternetGetCookieExW(lpszUrl, lpszCookieName, lpszCookieData, lpdwSize, dwFlags, lpReserved)
# lpszUrl : LPCWSTR -> "char*"
# lpszCookieName : LPCWSTR optional -> "char*"
# lpszCookieData : LPWSTR optional -> "char*"
# lpdwSize : DWORD* in/out -> "void*"
# dwFlags : INTERNET_COOKIE_FLAGS -> "dword"
# lpReserved : void* optional -> "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。