WinHttpQueryHeaders

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

BOOL WinHttpQueryHeaders(
    void* hRequest,
    DWORD dwInfoLevel,
    LPCWSTR pwszName,
    void* lpBuffer,   // optional
    DWORD* lpdwBufferLength,
    DWORD* lpdwIndex
);

<DllImport("WINHTTP.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WinHttpQueryHeaders(
    hRequest As IntPtr,   ' void* in/out
    dwInfoLevel As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pwszName As String,   ' LPCWSTR
    lpBuffer As IntPtr,   ' void* optional, out
    ByRef lpdwBufferLength As UInteger,   ' DWORD* in/out
    ByRef lpdwIndex As UInteger   ' DWORD* in/out
) As Boolean
End Function

' hRequest : void* in/out
' dwInfoLevel : DWORD
' pwszName : LPCWSTR
' lpBuffer : void* optional, out
' lpdwBufferLength : DWORD* in/out
' lpdwIndex : DWORD* in/out
Declare PtrSafe Function WinHttpQueryHeaders Lib "winhttp" ( _
    ByVal hRequest As LongPtr, _
    ByVal dwInfoLevel As Long, _
    ByVal pwszName As LongPtr, _
    ByVal lpBuffer As LongPtr, _
    ByRef lpdwBufferLength As Long, _
    ByRef lpdwIndex 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

WinHttpQueryHeaders = ctypes.windll.winhttp.WinHttpQueryHeaders
WinHttpQueryHeaders.restype = wintypes.BOOL
WinHttpQueryHeaders.argtypes = [
    ctypes.POINTER(None),  # hRequest : void* in/out
    wintypes.DWORD,  # dwInfoLevel : DWORD
    wintypes.LPCWSTR,  # pwszName : LPCWSTR
    ctypes.POINTER(None),  # lpBuffer : void* optional, out
    ctypes.POINTER(wintypes.DWORD),  # lpdwBufferLength : DWORD* in/out
    ctypes.POINTER(wintypes.DWORD),  # lpdwIndex : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINHTTP.dll')
WinHttpQueryHeaders = Fiddle::Function.new(
  lib['WinHttpQueryHeaders'],
  [
    Fiddle::TYPE_VOIDP,  # hRequest : void* in/out
    -Fiddle::TYPE_INT,  # dwInfoLevel : DWORD
    Fiddle::TYPE_VOIDP,  # pwszName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpBuffer : void* optional, out
    Fiddle::TYPE_VOIDP,  # lpdwBufferLength : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # lpdwIndex : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "winhttp")]
extern "system" {
    fn WinHttpQueryHeaders(
        hRequest: *mut (),  // void* in/out
        dwInfoLevel: u32,  // DWORD
        pwszName: *const u16,  // LPCWSTR
        lpBuffer: *mut (),  // void* optional, out
        lpdwBufferLength: *mut u32,  // DWORD* in/out
        lpdwIndex: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WINHTTP.dll", SetLastError = true)]
public static extern bool WinHttpQueryHeaders(IntPtr hRequest, uint dwInfoLevel, [MarshalAs(UnmanagedType.LPWStr)] string pwszName, IntPtr lpBuffer, ref uint lpdwBufferLength, ref uint lpdwIndex);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINHTTP_WinHttpQueryHeaders' -Namespace Win32 -PassThru
# $api::WinHttpQueryHeaders(hRequest, dwInfoLevel, pwszName, lpBuffer, lpdwBufferLength, lpdwIndex)

#uselib "WINHTTP.dll"
#func global WinHttpQueryHeaders "WinHttpQueryHeaders" sptr, sptr, sptr, sptr, sptr, sptr
; WinHttpQueryHeaders hRequest, dwInfoLevel, pwszName, lpBuffer, varptr(lpdwBufferLength), varptr(lpdwIndex)   ; 戻り値は stat
; hRequest : void* in/out -> "sptr"
; dwInfoLevel : DWORD -> "sptr"
; pwszName : LPCWSTR -> "sptr"
; lpBuffer : void* optional, out -> "sptr"
; lpdwBufferLength : DWORD* in/out -> "sptr"
; lpdwIndex : DWORD* in/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 "WINHTTP.dll"
#cfunc global WinHttpQueryHeaders "WinHttpQueryHeaders" sptr, int, wstr, sptr, var, var
; res = WinHttpQueryHeaders(hRequest, dwInfoLevel, pwszName, lpBuffer, lpdwBufferLength, lpdwIndex)
; hRequest : void* in/out -> "sptr"
; dwInfoLevel : DWORD -> "int"
; pwszName : LPCWSTR -> "wstr"
; lpBuffer : void* optional, out -> "sptr"
; lpdwBufferLength : DWORD* in/out -> "var"
; lpdwIndex : DWORD* in/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。

; BOOL WinHttpQueryHeaders(void* hRequest, DWORD dwInfoLevel, LPCWSTR pwszName, void* lpBuffer, DWORD* lpdwBufferLength, DWORD* lpdwIndex)
#uselib "WINHTTP.dll"
#cfunc global WinHttpQueryHeaders "WinHttpQueryHeaders" intptr, int, wstr, intptr, var, var
; res = WinHttpQueryHeaders(hRequest, dwInfoLevel, pwszName, lpBuffer, lpdwBufferLength, lpdwIndex)
; hRequest : void* in/out -> "intptr"
; dwInfoLevel : DWORD -> "int"
; pwszName : LPCWSTR -> "wstr"
; lpBuffer : void* optional, out -> "intptr"
; lpdwBufferLength : DWORD* in/out -> "var"
; lpdwIndex : DWORD* in/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 (
	winhttp = windows.NewLazySystemDLL("WINHTTP.dll")
	procWinHttpQueryHeaders = winhttp.NewProc("WinHttpQueryHeaders")
)

// hRequest (void* in/out), dwInfoLevel (DWORD), pwszName (LPCWSTR), lpBuffer (void* optional, out), lpdwBufferLength (DWORD* in/out), lpdwIndex (DWORD* in/out)
r1, _, err := procWinHttpQueryHeaders.Call(
	uintptr(hRequest),
	uintptr(dwInfoLevel),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwszName))),
	uintptr(lpBuffer),
	uintptr(lpdwBufferLength),
	uintptr(lpdwIndex),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function WinHttpQueryHeaders(
  hRequest: Pointer;   // void* in/out
  dwInfoLevel: DWORD;   // DWORD
  pwszName: PWideChar;   // LPCWSTR
  lpBuffer: Pointer;   // void* optional, out
  lpdwBufferLength: Pointer;   // DWORD* in/out
  lpdwIndex: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'WINHTTP.dll' name 'WinHttpQueryHeaders';

result := DllCall("WINHTTP\WinHttpQueryHeaders"
    , "Ptr", hRequest   ; void* in/out
    , "UInt", dwInfoLevel   ; DWORD
    , "WStr", pwszName   ; LPCWSTR
    , "Ptr", lpBuffer   ; void* optional, out
    , "Ptr", lpdwBufferLength   ; DWORD* in/out
    , "Ptr", lpdwIndex   ; DWORD* in/out
    , "Int")   ; return: BOOL

●WinHttpQueryHeaders(hRequest, dwInfoLevel, pwszName, lpBuffer, lpdwBufferLength, lpdwIndex) = DLL("WINHTTP.dll", "bool WinHttpQueryHeaders(void*, dword, char*, void*, void*, void*)")
# 呼び出し: WinHttpQueryHeaders(hRequest, dwInfoLevel, pwszName, lpBuffer, lpdwBufferLength, lpdwIndex)
# hRequest : void* in/out -> "void*"
# dwInfoLevel : DWORD -> "dword"
# pwszName : LPCWSTR -> "char*"
# lpBuffer : void* optional, out -> "void*"
# lpdwBufferLength : DWORD* in/out -> "void*"
# lpdwIndex : DWORD* in/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)。