WinHttpAddRequestHeadersEx

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

DWORD WinHttpAddRequestHeadersEx(
    void* hRequest,
    DWORD dwModifiers,
    ULONGLONG ullFlags,
    ULONGLONG ullExtra,
    DWORD cHeaders,
    WINHTTP_EXTENDED_HEADER* pHeaders
);

<DllImport("WINHTTP.dll", ExactSpelling:=True)>
Public Shared Function WinHttpAddRequestHeadersEx(
    hRequest As IntPtr,   ' void* in/out
    dwModifiers As UInteger,   ' DWORD
    ullFlags As ULong,   ' ULONGLONG
    ullExtra As ULong,   ' ULONGLONG
    cHeaders As UInteger,   ' DWORD
    pHeaders As IntPtr   ' WINHTTP_EXTENDED_HEADER*
) As UInteger
End Function

' hRequest : void* in/out
' dwModifiers : DWORD
' ullFlags : ULONGLONG
' ullExtra : ULONGLONG
' cHeaders : DWORD
' pHeaders : WINHTTP_EXTENDED_HEADER*
Declare PtrSafe Function WinHttpAddRequestHeadersEx Lib "winhttp" ( _
    ByVal hRequest As LongPtr, _
    ByVal dwModifiers As Long, _
    ByVal ullFlags As LongLong, _
    ByVal ullExtra As LongLong, _
    ByVal cHeaders As Long, _
    ByVal pHeaders 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

WinHttpAddRequestHeadersEx = ctypes.windll.winhttp.WinHttpAddRequestHeadersEx
WinHttpAddRequestHeadersEx.restype = wintypes.DWORD
WinHttpAddRequestHeadersEx.argtypes = [
    ctypes.POINTER(None),  # hRequest : void* in/out
    wintypes.DWORD,  # dwModifiers : DWORD
    ctypes.c_ulonglong,  # ullFlags : ULONGLONG
    ctypes.c_ulonglong,  # ullExtra : ULONGLONG
    wintypes.DWORD,  # cHeaders : DWORD
    ctypes.c_void_p,  # pHeaders : WINHTTP_EXTENDED_HEADER*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINHTTP.dll')
WinHttpAddRequestHeadersEx = Fiddle::Function.new(
  lib['WinHttpAddRequestHeadersEx'],
  [
    Fiddle::TYPE_VOIDP,  # hRequest : void* in/out
    -Fiddle::TYPE_INT,  # dwModifiers : DWORD
    -Fiddle::TYPE_LONG_LONG,  # ullFlags : ULONGLONG
    -Fiddle::TYPE_LONG_LONG,  # ullExtra : ULONGLONG
    -Fiddle::TYPE_INT,  # cHeaders : DWORD
    Fiddle::TYPE_VOIDP,  # pHeaders : WINHTTP_EXTENDED_HEADER*
  ],
  -Fiddle::TYPE_INT)

#[link(name = "winhttp")]
extern "system" {
    fn WinHttpAddRequestHeadersEx(
        hRequest: *mut (),  // void* in/out
        dwModifiers: u32,  // DWORD
        ullFlags: u64,  // ULONGLONG
        ullExtra: u64,  // ULONGLONG
        cHeaders: u32,  // DWORD
        pHeaders: *mut WINHTTP_EXTENDED_HEADER  // WINHTTP_EXTENDED_HEADER*
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WINHTTP.dll")]
public static extern uint WinHttpAddRequestHeadersEx(IntPtr hRequest, uint dwModifiers, ulong ullFlags, ulong ullExtra, uint cHeaders, IntPtr pHeaders);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINHTTP_WinHttpAddRequestHeadersEx' -Namespace Win32 -PassThru
# $api::WinHttpAddRequestHeadersEx(hRequest, dwModifiers, ullFlags, ullExtra, cHeaders, pHeaders)

#uselib "WINHTTP.dll"
#func global WinHttpAddRequestHeadersEx "WinHttpAddRequestHeadersEx" sptr, sptr, sptr, sptr, sptr, sptr
; WinHttpAddRequestHeadersEx hRequest, dwModifiers, ullFlags, ullExtra, cHeaders, varptr(pHeaders)   ; 戻り値は stat
; hRequest : void* in/out -> "sptr"
; dwModifiers : DWORD -> "sptr"
; ullFlags : ULONGLONG -> "sptr"
; ullExtra : ULONGLONG -> "sptr"
; cHeaders : DWORD -> "sptr"
; pHeaders : WINHTTP_EXTENDED_HEADER* -> "sptr"
; ※HSP3.7は int64 引数(64bit値渡し)に非対応です。
; ※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 "WINHTTP.dll"
#cfunc global WinHttpAddRequestHeadersEx "WinHttpAddRequestHeadersEx" sptr, int, int64, int64, int, var
; res = WinHttpAddRequestHeadersEx(hRequest, dwModifiers, ullFlags, ullExtra, cHeaders, pHeaders)
; hRequest : void* in/out -> "sptr"
; dwModifiers : DWORD -> "int"
; ullFlags : ULONGLONG -> "int64"
; ullExtra : ULONGLONG -> "int64"
; cHeaders : DWORD -> "int"
; pHeaders : WINHTTP_EXTENDED_HEADER* -> "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。
; ※int64 引数の DLL 値渡しは x64 ランタイム(hsp3_64)のみ対応(x86 は未対応)。

; DWORD WinHttpAddRequestHeadersEx(void* hRequest, DWORD dwModifiers, ULONGLONG ullFlags, ULONGLONG ullExtra, DWORD cHeaders, WINHTTP_EXTENDED_HEADER* pHeaders)
#uselib "WINHTTP.dll"
#cfunc global WinHttpAddRequestHeadersEx "WinHttpAddRequestHeadersEx" intptr, int, int64, int64, int, var
; res = WinHttpAddRequestHeadersEx(hRequest, dwModifiers, ullFlags, ullExtra, cHeaders, pHeaders)
; hRequest : void* in/out -> "intptr"
; dwModifiers : DWORD -> "int"
; ullFlags : ULONGLONG -> "int64"
; ullExtra : ULONGLONG -> "int64"
; cHeaders : DWORD -> "int"
; pHeaders : WINHTTP_EXTENDED_HEADER* -> "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 (
	winhttp = windows.NewLazySystemDLL("WINHTTP.dll")
	procWinHttpAddRequestHeadersEx = winhttp.NewProc("WinHttpAddRequestHeadersEx")
)

// hRequest (void* in/out), dwModifiers (DWORD), ullFlags (ULONGLONG), ullExtra (ULONGLONG), cHeaders (DWORD), pHeaders (WINHTTP_EXTENDED_HEADER*)
r1, _, err := procWinHttpAddRequestHeadersEx.Call(
	uintptr(hRequest),
	uintptr(dwModifiers),
	uintptr(ullFlags),
	uintptr(ullExtra),
	uintptr(cHeaders),
	uintptr(pHeaders),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function WinHttpAddRequestHeadersEx(
  hRequest: Pointer;   // void* in/out
  dwModifiers: DWORD;   // DWORD
  ullFlags: UInt64;   // ULONGLONG
  ullExtra: UInt64;   // ULONGLONG
  cHeaders: DWORD;   // DWORD
  pHeaders: Pointer   // WINHTTP_EXTENDED_HEADER*
): DWORD; stdcall;
  external 'WINHTTP.dll' name 'WinHttpAddRequestHeadersEx';

result := DllCall("WINHTTP\WinHttpAddRequestHeadersEx"
    , "Ptr", hRequest   ; void* in/out
    , "UInt", dwModifiers   ; DWORD
    , "Int64", ullFlags   ; ULONGLONG
    , "Int64", ullExtra   ; ULONGLONG
    , "UInt", cHeaders   ; DWORD
    , "Ptr", pHeaders   ; WINHTTP_EXTENDED_HEADER*
    , "UInt")   ; return: DWORD

●WinHttpAddRequestHeadersEx(hRequest, dwModifiers, ullFlags, ullExtra, cHeaders, pHeaders) = DLL("WINHTTP.dll", "dword WinHttpAddRequestHeadersEx(void*, dword, qword, qword, dword, void*)")
# 呼び出し: WinHttpAddRequestHeadersEx(hRequest, dwModifiers, ullFlags, ullExtra, cHeaders, pHeaders)
# hRequest : void* in/out -> "void*"
# dwModifiers : DWORD -> "dword"
# ullFlags : ULONGLONG -> "qword"
# ullExtra : ULONGLONG -> "qword"
# cHeaders : DWORD -> "dword"
# pHeaders : WINHTTP_EXTENDED_HEADER* -> "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)。