HttpAddRequestHeadersW

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

BOOL HttpAddRequestHeadersW(
    void* hRequest,
    LPCWSTR lpszHeaders,
    DWORD dwHeadersLength,
    HTTP_ADDREQ_FLAG dwModifiers
);

<DllImport("WININET.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function HttpAddRequestHeadersW(
    hRequest As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPWStr)> lpszHeaders As String,   ' LPCWSTR
    dwHeadersLength As UInteger,   ' DWORD
    dwModifiers As UInteger   ' HTTP_ADDREQ_FLAG
) As Boolean
End Function

' hRequest : void*
' lpszHeaders : LPCWSTR
' dwHeadersLength : DWORD
' dwModifiers : HTTP_ADDREQ_FLAG
Declare PtrSafe Function HttpAddRequestHeadersW Lib "wininet" ( _
    ByVal hRequest As LongPtr, _
    ByVal lpszHeaders As LongPtr, _
    ByVal dwHeadersLength As Long, _
    ByVal dwModifiers As Long) 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

HttpAddRequestHeadersW = ctypes.windll.wininet.HttpAddRequestHeadersW
HttpAddRequestHeadersW.restype = wintypes.BOOL
HttpAddRequestHeadersW.argtypes = [
    ctypes.POINTER(None),  # hRequest : void*
    wintypes.LPCWSTR,  # lpszHeaders : LPCWSTR
    wintypes.DWORD,  # dwHeadersLength : DWORD
    wintypes.DWORD,  # dwModifiers : HTTP_ADDREQ_FLAG
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
HttpAddRequestHeadersW = Fiddle::Function.new(
  lib['HttpAddRequestHeadersW'],
  [
    Fiddle::TYPE_VOIDP,  # hRequest : void*
    Fiddle::TYPE_VOIDP,  # lpszHeaders : LPCWSTR
    -Fiddle::TYPE_INT,  # dwHeadersLength : DWORD
    -Fiddle::TYPE_INT,  # dwModifiers : HTTP_ADDREQ_FLAG
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "wininet")]
extern "system" {
    fn HttpAddRequestHeadersW(
        hRequest: *mut (),  // void*
        lpszHeaders: *const u16,  // LPCWSTR
        dwHeadersLength: u32,  // DWORD
        dwModifiers: u32  // HTTP_ADDREQ_FLAG
    ) -> 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 HttpAddRequestHeadersW(IntPtr hRequest, [MarshalAs(UnmanagedType.LPWStr)] string lpszHeaders, uint dwHeadersLength, uint dwModifiers);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_HttpAddRequestHeadersW' -Namespace Win32 -PassThru
# $api::HttpAddRequestHeadersW(hRequest, lpszHeaders, dwHeadersLength, dwModifiers)

#uselib "WININET.dll"
#func global HttpAddRequestHeadersW "HttpAddRequestHeadersW" wptr, wptr, wptr, wptr
; HttpAddRequestHeadersW hRequest, lpszHeaders, dwHeadersLength, dwModifiers   ; 戻り値は stat
; hRequest : void* -> "wptr"
; lpszHeaders : LPCWSTR -> "wptr"
; dwHeadersLength : DWORD -> "wptr"
; dwModifiers : HTTP_ADDREQ_FLAG -> "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 HttpAddRequestHeadersW "HttpAddRequestHeadersW" sptr, wstr, int, int
; res = HttpAddRequestHeadersW(hRequest, lpszHeaders, dwHeadersLength, dwModifiers)
; hRequest : void* -> "sptr"
; lpszHeaders : LPCWSTR -> "wstr"
; dwHeadersLength : DWORD -> "int"
; dwModifiers : HTTP_ADDREQ_FLAG -> "int"

; BOOL HttpAddRequestHeadersW(void* hRequest, LPCWSTR lpszHeaders, DWORD dwHeadersLength, HTTP_ADDREQ_FLAG dwModifiers)
#uselib "WININET.dll"
#cfunc global HttpAddRequestHeadersW "HttpAddRequestHeadersW" intptr, wstr, int, int
; res = HttpAddRequestHeadersW(hRequest, lpszHeaders, dwHeadersLength, dwModifiers)
; hRequest : void* -> "intptr"
; lpszHeaders : LPCWSTR -> "wstr"
; dwHeadersLength : DWORD -> "int"
; dwModifiers : HTTP_ADDREQ_FLAG -> "int"

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procHttpAddRequestHeadersW = wininet.NewProc("HttpAddRequestHeadersW")
)

// hRequest (void*), lpszHeaders (LPCWSTR), dwHeadersLength (DWORD), dwModifiers (HTTP_ADDREQ_FLAG)
r1, _, err := procHttpAddRequestHeadersW.Call(
	uintptr(hRequest),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszHeaders))),
	uintptr(dwHeadersLength),
	uintptr(dwModifiers),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function HttpAddRequestHeadersW(
  hRequest: Pointer;   // void*
  lpszHeaders: PWideChar;   // LPCWSTR
  dwHeadersLength: DWORD;   // DWORD
  dwModifiers: DWORD   // HTTP_ADDREQ_FLAG
): BOOL; stdcall;
  external 'WININET.dll' name 'HttpAddRequestHeadersW';

result := DllCall("WININET\HttpAddRequestHeadersW"
    , "Ptr", hRequest   ; void*
    , "WStr", lpszHeaders   ; LPCWSTR
    , "UInt", dwHeadersLength   ; DWORD
    , "UInt", dwModifiers   ; HTTP_ADDREQ_FLAG
    , "Int")   ; return: BOOL

●HttpAddRequestHeadersW(hRequest, lpszHeaders, dwHeadersLength, dwModifiers) = DLL("WININET.dll", "bool HttpAddRequestHeadersW(void*, char*, dword, dword)")
# 呼び出し: HttpAddRequestHeadersW(hRequest, lpszHeaders, dwHeadersLength, dwModifiers)
# hRequest : void* -> "void*"
# lpszHeaders : LPCWSTR -> "char*"
# dwHeadersLength : DWORD -> "dword"
# dwModifiers : HTTP_ADDREQ_FLAG -> "dword"
# 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。