InternetSetCookieEx2

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

DWORD InternetSetCookieEx2(
    LPCWSTR pcwszUrl,
    const INTERNET_COOKIE2* pCookie,
    LPCWSTR pcwszP3PPolicy,   // optional
    DWORD dwFlags,
    DWORD* pdwCookieState
);

<DllImport("WININET.dll", ExactSpelling:=True)>
Public Shared Function InternetSetCookieEx2(
    <MarshalAs(UnmanagedType.LPWStr)> pcwszUrl As String,   ' LPCWSTR
    pCookie As IntPtr,   ' INTERNET_COOKIE2*
    <MarshalAs(UnmanagedType.LPWStr)> pcwszP3PPolicy As String,   ' LPCWSTR optional
    dwFlags As UInteger,   ' DWORD
    <Out> ByRef pdwCookieState As UInteger   ' DWORD* out
) As UInteger
End Function

' pcwszUrl : LPCWSTR
' pCookie : INTERNET_COOKIE2*
' pcwszP3PPolicy : LPCWSTR optional
' dwFlags : DWORD
' pdwCookieState : DWORD* out
Declare PtrSafe Function InternetSetCookieEx2 Lib "wininet" ( _
    ByVal pcwszUrl As LongPtr, _
    ByVal pCookie As LongPtr, _
    ByVal pcwszP3PPolicy As LongPtr, _
    ByVal dwFlags As Long, _
    ByRef pdwCookieState As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

InternetSetCookieEx2 = ctypes.windll.wininet.InternetSetCookieEx2
InternetSetCookieEx2.restype = wintypes.DWORD
InternetSetCookieEx2.argtypes = [
    wintypes.LPCWSTR,  # pcwszUrl : LPCWSTR
    ctypes.c_void_p,  # pCookie : INTERNET_COOKIE2*
    wintypes.LPCWSTR,  # pcwszP3PPolicy : LPCWSTR optional
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pdwCookieState : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
InternetSetCookieEx2 = Fiddle::Function.new(
  lib['InternetSetCookieEx2'],
  [
    Fiddle::TYPE_VOIDP,  # pcwszUrl : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pCookie : INTERNET_COOKIE2*
    Fiddle::TYPE_VOIDP,  # pcwszP3PPolicy : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pdwCookieState : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "wininet")]
extern "system" {
    fn InternetSetCookieEx2(
        pcwszUrl: *const u16,  // LPCWSTR
        pCookie: *const INTERNET_COOKIE2,  // INTERNET_COOKIE2*
        pcwszP3PPolicy: *const u16,  // LPCWSTR optional
        dwFlags: u32,  // DWORD
        pdwCookieState: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WININET.dll")]
public static extern uint InternetSetCookieEx2([MarshalAs(UnmanagedType.LPWStr)] string pcwszUrl, IntPtr pCookie, [MarshalAs(UnmanagedType.LPWStr)] string pcwszP3PPolicy, uint dwFlags, out uint pdwCookieState);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetSetCookieEx2' -Namespace Win32 -PassThru
# $api::InternetSetCookieEx2(pcwszUrl, pCookie, pcwszP3PPolicy, dwFlags, pdwCookieState)

#uselib "WININET.dll"
#func global InternetSetCookieEx2 "InternetSetCookieEx2" sptr, sptr, sptr, sptr, sptr
; InternetSetCookieEx2 pcwszUrl, varptr(pCookie), pcwszP3PPolicy, dwFlags, varptr(pdwCookieState)   ; 戻り値は stat
; pcwszUrl : LPCWSTR -> "sptr"
; pCookie : INTERNET_COOKIE2* -> "sptr"
; pcwszP3PPolicy : LPCWSTR optional -> "sptr"
; dwFlags : DWORD -> "sptr"
; pdwCookieState : DWORD* 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 "WININET.dll"
#cfunc global InternetSetCookieEx2 "InternetSetCookieEx2" wstr, var, wstr, int, var
; res = InternetSetCookieEx2(pcwszUrl, pCookie, pcwszP3PPolicy, dwFlags, pdwCookieState)
; pcwszUrl : LPCWSTR -> "wstr"
; pCookie : INTERNET_COOKIE2* -> "var"
; pcwszP3PPolicy : LPCWSTR optional -> "wstr"
; dwFlags : DWORD -> "int"
; pdwCookieState : DWORD* 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 InternetSetCookieEx2(LPCWSTR pcwszUrl, INTERNET_COOKIE2* pCookie, LPCWSTR pcwszP3PPolicy, DWORD dwFlags, DWORD* pdwCookieState)
#uselib "WININET.dll"
#cfunc global InternetSetCookieEx2 "InternetSetCookieEx2" wstr, var, wstr, int, var
; res = InternetSetCookieEx2(pcwszUrl, pCookie, pcwszP3PPolicy, dwFlags, pdwCookieState)
; pcwszUrl : LPCWSTR -> "wstr"
; pCookie : INTERNET_COOKIE2* -> "var"
; pcwszP3PPolicy : LPCWSTR optional -> "wstr"
; dwFlags : DWORD -> "int"
; pdwCookieState : DWORD* 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 (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetSetCookieEx2 = wininet.NewProc("InternetSetCookieEx2")
)

// pcwszUrl (LPCWSTR), pCookie (INTERNET_COOKIE2*), pcwszP3PPolicy (LPCWSTR optional), dwFlags (DWORD), pdwCookieState (DWORD* out)
r1, _, err := procInternetSetCookieEx2.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pcwszUrl))),
	uintptr(pCookie),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pcwszP3PPolicy))),
	uintptr(dwFlags),
	uintptr(pdwCookieState),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function InternetSetCookieEx2(
  pcwszUrl: PWideChar;   // LPCWSTR
  pCookie: Pointer;   // INTERNET_COOKIE2*
  pcwszP3PPolicy: PWideChar;   // LPCWSTR optional
  dwFlags: DWORD;   // DWORD
  pdwCookieState: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'WININET.dll' name 'InternetSetCookieEx2';

result := DllCall("WININET\InternetSetCookieEx2"
    , "WStr", pcwszUrl   ; LPCWSTR
    , "Ptr", pCookie   ; INTERNET_COOKIE2*
    , "WStr", pcwszP3PPolicy   ; LPCWSTR optional
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pdwCookieState   ; DWORD* out
    , "UInt")   ; return: DWORD

●InternetSetCookieEx2(pcwszUrl, pCookie, pcwszP3PPolicy, dwFlags, pdwCookieState) = DLL("WININET.dll", "dword InternetSetCookieEx2(char*, void*, char*, dword, void*)")
# 呼び出し: InternetSetCookieEx2(pcwszUrl, pCookie, pcwszP3PPolicy, dwFlags, pdwCookieState)
# pcwszUrl : LPCWSTR -> "char*"
# pCookie : INTERNET_COOKIE2* -> "void*"
# pcwszP3PPolicy : LPCWSTR optional -> "char*"
# dwFlags : DWORD -> "dword"
# pdwCookieState : DWORD* 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)。