WinHttpGetProxyForUrl

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

BOOL WinHttpGetProxyForUrl(
    void* hSession,
    LPCWSTR lpcwszUrl,
    WINHTTP_AUTOPROXY_OPTIONS* pAutoProxyOptions,
    WINHTTP_PROXY_INFO* pProxyInfo
);

<DllImport("WINHTTP.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WinHttpGetProxyForUrl(
    hSession As IntPtr,   ' void* in/out
    <MarshalAs(UnmanagedType.LPWStr)> lpcwszUrl As String,   ' LPCWSTR
    pAutoProxyOptions As IntPtr,   ' WINHTTP_AUTOPROXY_OPTIONS* in/out
    pProxyInfo As IntPtr   ' WINHTTP_PROXY_INFO* in/out
) As Boolean
End Function

' hSession : void* in/out
' lpcwszUrl : LPCWSTR
' pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* in/out
' pProxyInfo : WINHTTP_PROXY_INFO* in/out
Declare PtrSafe Function WinHttpGetProxyForUrl Lib "winhttp" ( _
    ByVal hSession As LongPtr, _
    ByVal lpcwszUrl As LongPtr, _
    ByVal pAutoProxyOptions As LongPtr, _
    ByVal pProxyInfo 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

WinHttpGetProxyForUrl = ctypes.windll.winhttp.WinHttpGetProxyForUrl
WinHttpGetProxyForUrl.restype = wintypes.BOOL
WinHttpGetProxyForUrl.argtypes = [
    ctypes.POINTER(None),  # hSession : void* in/out
    wintypes.LPCWSTR,  # lpcwszUrl : LPCWSTR
    ctypes.c_void_p,  # pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* in/out
    ctypes.c_void_p,  # pProxyInfo : WINHTTP_PROXY_INFO* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINHTTP.dll')
WinHttpGetProxyForUrl = Fiddle::Function.new(
  lib['WinHttpGetProxyForUrl'],
  [
    Fiddle::TYPE_VOIDP,  # hSession : void* in/out
    Fiddle::TYPE_VOIDP,  # lpcwszUrl : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* in/out
    Fiddle::TYPE_VOIDP,  # pProxyInfo : WINHTTP_PROXY_INFO* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "winhttp")]
extern "system" {
    fn WinHttpGetProxyForUrl(
        hSession: *mut (),  // void* in/out
        lpcwszUrl: *const u16,  // LPCWSTR
        pAutoProxyOptions: *mut WINHTTP_AUTOPROXY_OPTIONS,  // WINHTTP_AUTOPROXY_OPTIONS* in/out
        pProxyInfo: *mut WINHTTP_PROXY_INFO  // WINHTTP_PROXY_INFO* 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 WinHttpGetProxyForUrl(IntPtr hSession, [MarshalAs(UnmanagedType.LPWStr)] string lpcwszUrl, IntPtr pAutoProxyOptions, IntPtr pProxyInfo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINHTTP_WinHttpGetProxyForUrl' -Namespace Win32 -PassThru
# $api::WinHttpGetProxyForUrl(hSession, lpcwszUrl, pAutoProxyOptions, pProxyInfo)

#uselib "WINHTTP.dll"
#func global WinHttpGetProxyForUrl "WinHttpGetProxyForUrl" sptr, sptr, sptr, sptr
; WinHttpGetProxyForUrl hSession, lpcwszUrl, varptr(pAutoProxyOptions), varptr(pProxyInfo)   ; 戻り値は stat
; hSession : void* in/out -> "sptr"
; lpcwszUrl : LPCWSTR -> "sptr"
; pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* in/out -> "sptr"
; pProxyInfo : WINHTTP_PROXY_INFO* 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 WinHttpGetProxyForUrl "WinHttpGetProxyForUrl" sptr, wstr, var, var
; res = WinHttpGetProxyForUrl(hSession, lpcwszUrl, pAutoProxyOptions, pProxyInfo)
; hSession : void* in/out -> "sptr"
; lpcwszUrl : LPCWSTR -> "wstr"
; pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* in/out -> "var"
; pProxyInfo : WINHTTP_PROXY_INFO* 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 WinHttpGetProxyForUrl(void* hSession, LPCWSTR lpcwszUrl, WINHTTP_AUTOPROXY_OPTIONS* pAutoProxyOptions, WINHTTP_PROXY_INFO* pProxyInfo)
#uselib "WINHTTP.dll"
#cfunc global WinHttpGetProxyForUrl "WinHttpGetProxyForUrl" intptr, wstr, var, var
; res = WinHttpGetProxyForUrl(hSession, lpcwszUrl, pAutoProxyOptions, pProxyInfo)
; hSession : void* in/out -> "intptr"
; lpcwszUrl : LPCWSTR -> "wstr"
; pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* in/out -> "var"
; pProxyInfo : WINHTTP_PROXY_INFO* 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")
	procWinHttpGetProxyForUrl = winhttp.NewProc("WinHttpGetProxyForUrl")
)

// hSession (void* in/out), lpcwszUrl (LPCWSTR), pAutoProxyOptions (WINHTTP_AUTOPROXY_OPTIONS* in/out), pProxyInfo (WINHTTP_PROXY_INFO* in/out)
r1, _, err := procWinHttpGetProxyForUrl.Call(
	uintptr(hSession),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpcwszUrl))),
	uintptr(pAutoProxyOptions),
	uintptr(pProxyInfo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function WinHttpGetProxyForUrl(
  hSession: Pointer;   // void* in/out
  lpcwszUrl: PWideChar;   // LPCWSTR
  pAutoProxyOptions: Pointer;   // WINHTTP_AUTOPROXY_OPTIONS* in/out
  pProxyInfo: Pointer   // WINHTTP_PROXY_INFO* in/out
): BOOL; stdcall;
  external 'WINHTTP.dll' name 'WinHttpGetProxyForUrl';

result := DllCall("WINHTTP\WinHttpGetProxyForUrl"
    , "Ptr", hSession   ; void* in/out
    , "WStr", lpcwszUrl   ; LPCWSTR
    , "Ptr", pAutoProxyOptions   ; WINHTTP_AUTOPROXY_OPTIONS* in/out
    , "Ptr", pProxyInfo   ; WINHTTP_PROXY_INFO* in/out
    , "Int")   ; return: BOOL

●WinHttpGetProxyForUrl(hSession, lpcwszUrl, pAutoProxyOptions, pProxyInfo) = DLL("WINHTTP.dll", "bool WinHttpGetProxyForUrl(void*, char*, void*, void*)")
# 呼び出し: WinHttpGetProxyForUrl(hSession, lpcwszUrl, pAutoProxyOptions, pProxyInfo)
# hSession : void* in/out -> "void*"
# lpcwszUrl : LPCWSTR -> "char*"
# pAutoProxyOptions : WINHTTP_AUTOPROXY_OPTIONS* in/out -> "void*"
# pProxyInfo : WINHTTP_PROXY_INFO* 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)。