InternetSetCookieW

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

BOOL InternetSetCookieW(
    LPCWSTR lpszUrl,
    LPCWSTR lpszCookieName,   // optional
    LPCWSTR lpszCookieData
);

<DllImport("WININET.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InternetSetCookieW(
    <MarshalAs(UnmanagedType.LPWStr)> lpszUrl As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpszCookieName As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> lpszCookieData As String   ' LPCWSTR
) As Boolean
End Function

' lpszUrl : LPCWSTR
' lpszCookieName : LPCWSTR optional
' lpszCookieData : LPCWSTR
Declare PtrSafe Function InternetSetCookieW Lib "wininet" ( _
    ByVal lpszUrl As LongPtr, _
    ByVal lpszCookieName As LongPtr, _
    ByVal lpszCookieData 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

InternetSetCookieW = ctypes.windll.wininet.InternetSetCookieW
InternetSetCookieW.restype = wintypes.BOOL
InternetSetCookieW.argtypes = [
    wintypes.LPCWSTR,  # lpszUrl : LPCWSTR
    wintypes.LPCWSTR,  # lpszCookieName : LPCWSTR optional
    wintypes.LPCWSTR,  # lpszCookieData : LPCWSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
InternetSetCookieW = Fiddle::Function.new(
  lib['InternetSetCookieW'],
  [
    Fiddle::TYPE_VOIDP,  # lpszUrl : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpszCookieName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # lpszCookieData : LPCWSTR
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "wininet")]
extern "system" {
    fn InternetSetCookieW(
        lpszUrl: *const u16,  // LPCWSTR
        lpszCookieName: *const u16,  // LPCWSTR optional
        lpszCookieData: *const u16  // LPCWSTR
    ) -> 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 InternetSetCookieW([MarshalAs(UnmanagedType.LPWStr)] string lpszUrl, [MarshalAs(UnmanagedType.LPWStr)] string lpszCookieName, [MarshalAs(UnmanagedType.LPWStr)] string lpszCookieData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetSetCookieW' -Namespace Win32 -PassThru
# $api::InternetSetCookieW(lpszUrl, lpszCookieName, lpszCookieData)

#uselib "WININET.dll"
#func global InternetSetCookieW "InternetSetCookieW" wptr, wptr, wptr
; InternetSetCookieW lpszUrl, lpszCookieName, lpszCookieData   ; 戻り値は stat
; lpszUrl : LPCWSTR -> "wptr"
; lpszCookieName : LPCWSTR optional -> "wptr"
; lpszCookieData : LPCWSTR -> "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 InternetSetCookieW "InternetSetCookieW" wstr, wstr, wstr
; res = InternetSetCookieW(lpszUrl, lpszCookieName, lpszCookieData)
; lpszUrl : LPCWSTR -> "wstr"
; lpszCookieName : LPCWSTR optional -> "wstr"
; lpszCookieData : LPCWSTR -> "wstr"

; BOOL InternetSetCookieW(LPCWSTR lpszUrl, LPCWSTR lpszCookieName, LPCWSTR lpszCookieData)
#uselib "WININET.dll"
#cfunc global InternetSetCookieW "InternetSetCookieW" wstr, wstr, wstr
; res = InternetSetCookieW(lpszUrl, lpszCookieName, lpszCookieData)
; lpszUrl : LPCWSTR -> "wstr"
; lpszCookieName : LPCWSTR optional -> "wstr"
; lpszCookieData : LPCWSTR -> "wstr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetSetCookieW = wininet.NewProc("InternetSetCookieW")
)

// lpszUrl (LPCWSTR), lpszCookieName (LPCWSTR optional), lpszCookieData (LPCWSTR)
r1, _, err := procInternetSetCookieW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszUrl))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszCookieName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszCookieData))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function InternetSetCookieW(
  lpszUrl: PWideChar;   // LPCWSTR
  lpszCookieName: PWideChar;   // LPCWSTR optional
  lpszCookieData: PWideChar   // LPCWSTR
): BOOL; stdcall;
  external 'WININET.dll' name 'InternetSetCookieW';

result := DllCall("WININET\InternetSetCookieW"
    , "WStr", lpszUrl   ; LPCWSTR
    , "WStr", lpszCookieName   ; LPCWSTR optional
    , "WStr", lpszCookieData   ; LPCWSTR
    , "Int")   ; return: BOOL

●InternetSetCookieW(lpszUrl, lpszCookieName, lpszCookieData) = DLL("WININET.dll", "bool InternetSetCookieW(char*, char*, char*)")
# 呼び出し: InternetSetCookieW(lpszUrl, lpszCookieName, lpszCookieData)
# lpszUrl : LPCWSTR -> "char*"
# lpszCookieName : LPCWSTR optional -> "char*"
# lpszCookieData : LPCWSTR -> "char*"
# 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。