InternetGetProxyForUrl

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

DWORD InternetGetProxyForUrl(
    void* hInternet,
    LPCWSTR pcwszUrl,
    WININET_PROXY_INFO_LIST* pProxyInfoList
);

<DllImport("WININET.dll", ExactSpelling:=True)>
Public Shared Function InternetGetProxyForUrl(
    hInternet As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPWStr)> pcwszUrl As String,   ' LPCWSTR
    pProxyInfoList As IntPtr   ' WININET_PROXY_INFO_LIST* out
) As UInteger
End Function

' hInternet : void*
' pcwszUrl : LPCWSTR
' pProxyInfoList : WININET_PROXY_INFO_LIST* out
Declare PtrSafe Function InternetGetProxyForUrl Lib "wininet" ( _
    ByVal hInternet As LongPtr, _
    ByVal pcwszUrl As LongPtr, _
    ByVal pProxyInfoList 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

InternetGetProxyForUrl = ctypes.windll.wininet.InternetGetProxyForUrl
InternetGetProxyForUrl.restype = wintypes.DWORD
InternetGetProxyForUrl.argtypes = [
    ctypes.POINTER(None),  # hInternet : void*
    wintypes.LPCWSTR,  # pcwszUrl : LPCWSTR
    ctypes.c_void_p,  # pProxyInfoList : WININET_PROXY_INFO_LIST* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
InternetGetProxyForUrl = Fiddle::Function.new(
  lib['InternetGetProxyForUrl'],
  [
    Fiddle::TYPE_VOIDP,  # hInternet : void*
    Fiddle::TYPE_VOIDP,  # pcwszUrl : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pProxyInfoList : WININET_PROXY_INFO_LIST* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "wininet")]
extern "system" {
    fn InternetGetProxyForUrl(
        hInternet: *mut (),  // void*
        pcwszUrl: *const u16,  // LPCWSTR
        pProxyInfoList: *mut WININET_PROXY_INFO_LIST  // WININET_PROXY_INFO_LIST* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WININET.dll")]
public static extern uint InternetGetProxyForUrl(IntPtr hInternet, [MarshalAs(UnmanagedType.LPWStr)] string pcwszUrl, IntPtr pProxyInfoList);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetGetProxyForUrl' -Namespace Win32 -PassThru
# $api::InternetGetProxyForUrl(hInternet, pcwszUrl, pProxyInfoList)

#uselib "WININET.dll"
#func global InternetGetProxyForUrl "InternetGetProxyForUrl" sptr, sptr, sptr
; InternetGetProxyForUrl hInternet, pcwszUrl, varptr(pProxyInfoList)   ; 戻り値は stat
; hInternet : void* -> "sptr"
; pcwszUrl : LPCWSTR -> "sptr"
; pProxyInfoList : WININET_PROXY_INFO_LIST* 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 "WININET.dll"
#cfunc global InternetGetProxyForUrl "InternetGetProxyForUrl" sptr, wstr, var
; res = InternetGetProxyForUrl(hInternet, pcwszUrl, pProxyInfoList)
; hInternet : void* -> "sptr"
; pcwszUrl : LPCWSTR -> "wstr"
; pProxyInfoList : WININET_PROXY_INFO_LIST* 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。

; DWORD InternetGetProxyForUrl(void* hInternet, LPCWSTR pcwszUrl, WININET_PROXY_INFO_LIST* pProxyInfoList)
#uselib "WININET.dll"
#cfunc global InternetGetProxyForUrl "InternetGetProxyForUrl" intptr, wstr, var
; res = InternetGetProxyForUrl(hInternet, pcwszUrl, pProxyInfoList)
; hInternet : void* -> "intptr"
; pcwszUrl : LPCWSTR -> "wstr"
; pProxyInfoList : WININET_PROXY_INFO_LIST* 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 (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetGetProxyForUrl = wininet.NewProc("InternetGetProxyForUrl")
)

// hInternet (void*), pcwszUrl (LPCWSTR), pProxyInfoList (WININET_PROXY_INFO_LIST* out)
r1, _, err := procInternetGetProxyForUrl.Call(
	uintptr(hInternet),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pcwszUrl))),
	uintptr(pProxyInfoList),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function InternetGetProxyForUrl(
  hInternet: Pointer;   // void*
  pcwszUrl: PWideChar;   // LPCWSTR
  pProxyInfoList: Pointer   // WININET_PROXY_INFO_LIST* out
): DWORD; stdcall;
  external 'WININET.dll' name 'InternetGetProxyForUrl';

result := DllCall("WININET\InternetGetProxyForUrl"
    , "Ptr", hInternet   ; void*
    , "WStr", pcwszUrl   ; LPCWSTR
    , "Ptr", pProxyInfoList   ; WININET_PROXY_INFO_LIST* out
    , "UInt")   ; return: DWORD

●InternetGetProxyForUrl(hInternet, pcwszUrl, pProxyInfoList) = DLL("WININET.dll", "dword InternetGetProxyForUrl(void*, char*, void*)")
# 呼び出し: InternetGetProxyForUrl(hInternet, pcwszUrl, pProxyInfoList)
# hInternet : void* -> "void*"
# pcwszUrl : LPCWSTR -> "char*"
# pProxyInfoList : WININET_PROXY_INFO_LIST* 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)。