WinHttpGetProxyForUrlEx

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

DWORD WinHttpGetProxyForUrlEx(
    void* hResolver,
    LPCWSTR pcwszUrl,
    WINHTTP_AUTOPROXY_OPTIONS* pAutoProxyOptions,
    UINT_PTR pContext   // optional
);

<DllImport("WINHTTP.dll", ExactSpelling:=True)>
Public Shared Function WinHttpGetProxyForUrlEx(
    hResolver As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPWStr)> pcwszUrl As String,   ' LPCWSTR
    pAutoProxyOptions As IntPtr,   ' WINHTTP_AUTOPROXY_OPTIONS*
    pContext As UIntPtr   ' UINT_PTR optional
) As UInteger
End Function

' hResolver : void*
' pcwszUrl : LPCWSTR
' pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS*
' pContext : UINT_PTR optional
Declare PtrSafe Function WinHttpGetProxyForUrlEx Lib "winhttp" ( _
    ByVal hResolver As LongPtr, _
    ByVal pcwszUrl As LongPtr, _
    ByVal pAutoProxyOptions As LongPtr, _
    ByVal pContext 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

WinHttpGetProxyForUrlEx = ctypes.windll.winhttp.WinHttpGetProxyForUrlEx
WinHttpGetProxyForUrlEx.restype = wintypes.DWORD
WinHttpGetProxyForUrlEx.argtypes = [
    ctypes.POINTER(None),  # hResolver : void*
    wintypes.LPCWSTR,  # pcwszUrl : LPCWSTR
    ctypes.c_void_p,  # pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS*
    ctypes.c_size_t,  # pContext : UINT_PTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINHTTP.dll')
WinHttpGetProxyForUrlEx = Fiddle::Function.new(
  lib['WinHttpGetProxyForUrlEx'],
  [
    Fiddle::TYPE_VOIDP,  # hResolver : void*
    Fiddle::TYPE_VOIDP,  # pcwszUrl : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS*
    Fiddle::TYPE_UINTPTR_T,  # pContext : UINT_PTR optional
  ],
  -Fiddle::TYPE_INT)

#[link(name = "winhttp")]
extern "system" {
    fn WinHttpGetProxyForUrlEx(
        hResolver: *mut (),  // void*
        pcwszUrl: *const u16,  // LPCWSTR
        pAutoProxyOptions: *mut WINHTTP_AUTOPROXY_OPTIONS,  // WINHTTP_AUTOPROXY_OPTIONS*
        pContext: usize  // UINT_PTR optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WINHTTP.dll")]
public static extern uint WinHttpGetProxyForUrlEx(IntPtr hResolver, [MarshalAs(UnmanagedType.LPWStr)] string pcwszUrl, IntPtr pAutoProxyOptions, UIntPtr pContext);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINHTTP_WinHttpGetProxyForUrlEx' -Namespace Win32 -PassThru
# $api::WinHttpGetProxyForUrlEx(hResolver, pcwszUrl, pAutoProxyOptions, pContext)

#uselib "WINHTTP.dll"
#func global WinHttpGetProxyForUrlEx "WinHttpGetProxyForUrlEx" sptr, sptr, sptr, sptr
; WinHttpGetProxyForUrlEx hResolver, pcwszUrl, varptr(pAutoProxyOptions), pContext   ; 戻り値は stat
; hResolver : void* -> "sptr"
; pcwszUrl : LPCWSTR -> "sptr"
; pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* -> "sptr"
; pContext : UINT_PTR optional -> "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 WinHttpGetProxyForUrlEx "WinHttpGetProxyForUrlEx" sptr, wstr, var, sptr
; res = WinHttpGetProxyForUrlEx(hResolver, pcwszUrl, pAutoProxyOptions, pContext)
; hResolver : void* -> "sptr"
; pcwszUrl : LPCWSTR -> "wstr"
; pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* -> "var"
; pContext : UINT_PTR optional -> "sptr"
; ※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 WinHttpGetProxyForUrlEx(void* hResolver, LPCWSTR pcwszUrl, WINHTTP_AUTOPROXY_OPTIONS* pAutoProxyOptions, UINT_PTR pContext)
#uselib "WINHTTP.dll"
#cfunc global WinHttpGetProxyForUrlEx "WinHttpGetProxyForUrlEx" intptr, wstr, var, intptr
; res = WinHttpGetProxyForUrlEx(hResolver, pcwszUrl, pAutoProxyOptions, pContext)
; hResolver : void* -> "intptr"
; pcwszUrl : LPCWSTR -> "wstr"
; pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* -> "var"
; pContext : UINT_PTR optional -> "intptr"
; ※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")
	procWinHttpGetProxyForUrlEx = winhttp.NewProc("WinHttpGetProxyForUrlEx")
)

// hResolver (void*), pcwszUrl (LPCWSTR), pAutoProxyOptions (WINHTTP_AUTOPROXY_OPTIONS*), pContext (UINT_PTR optional)
r1, _, err := procWinHttpGetProxyForUrlEx.Call(
	uintptr(hResolver),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pcwszUrl))),
	uintptr(pAutoProxyOptions),
	uintptr(pContext),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function WinHttpGetProxyForUrlEx(
  hResolver: Pointer;   // void*
  pcwszUrl: PWideChar;   // LPCWSTR
  pAutoProxyOptions: Pointer;   // WINHTTP_AUTOPROXY_OPTIONS*
  pContext: NativeUInt   // UINT_PTR optional
): DWORD; stdcall;
  external 'WINHTTP.dll' name 'WinHttpGetProxyForUrlEx';

result := DllCall("WINHTTP\WinHttpGetProxyForUrlEx"
    , "Ptr", hResolver   ; void*
    , "WStr", pcwszUrl   ; LPCWSTR
    , "Ptr", pAutoProxyOptions   ; WINHTTP_AUTOPROXY_OPTIONS*
    , "UPtr", pContext   ; UINT_PTR optional
    , "UInt")   ; return: DWORD

●WinHttpGetProxyForUrlEx(hResolver, pcwszUrl, pAutoProxyOptions, pContext) = DLL("WINHTTP.dll", "dword WinHttpGetProxyForUrlEx(void*, char*, void*, int)")
# 呼び出し: WinHttpGetProxyForUrlEx(hResolver, pcwszUrl, pAutoProxyOptions, pContext)
# hResolver : void* -> "void*"
# pcwszUrl : LPCWSTR -> "char*"
# pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* -> "void*"
# pContext : UINT_PTR optional -> "int"
# 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)。