WinHttpRegisterProxyChangeNotification

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

DWORD WinHttpRegisterProxyChangeNotification(
    ULONGLONG ullFlags,
    WINHTTP_PROXY_CHANGE_CALLBACK pfnCallback,
    void* pvContext,
    void** hRegistration
);

<DllImport("WINHTTP.dll", ExactSpelling:=True)>
Public Shared Function WinHttpRegisterProxyChangeNotification(
    ullFlags As ULong,   ' ULONGLONG
    pfnCallback As IntPtr,   ' WINHTTP_PROXY_CHANGE_CALLBACK
    pvContext As IntPtr,   ' void*
    hRegistration As IntPtr   ' void** out
) As UInteger
End Function

' ullFlags : ULONGLONG
' pfnCallback : WINHTTP_PROXY_CHANGE_CALLBACK
' pvContext : void*
' hRegistration : void** out
Declare PtrSafe Function WinHttpRegisterProxyChangeNotification Lib "winhttp" ( _
    ByVal ullFlags As LongLong, _
    ByVal pfnCallback As LongPtr, _
    ByVal pvContext As LongPtr, _
    ByVal hRegistration 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

WinHttpRegisterProxyChangeNotification = ctypes.windll.winhttp.WinHttpRegisterProxyChangeNotification
WinHttpRegisterProxyChangeNotification.restype = wintypes.DWORD
WinHttpRegisterProxyChangeNotification.argtypes = [
    ctypes.c_ulonglong,  # ullFlags : ULONGLONG
    ctypes.c_void_p,  # pfnCallback : WINHTTP_PROXY_CHANGE_CALLBACK
    ctypes.POINTER(None),  # pvContext : void*
    ctypes.c_void_p,  # hRegistration : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINHTTP.dll')
WinHttpRegisterProxyChangeNotification = Fiddle::Function.new(
  lib['WinHttpRegisterProxyChangeNotification'],
  [
    -Fiddle::TYPE_LONG_LONG,  # ullFlags : ULONGLONG
    Fiddle::TYPE_VOIDP,  # pfnCallback : WINHTTP_PROXY_CHANGE_CALLBACK
    Fiddle::TYPE_VOIDP,  # pvContext : void*
    Fiddle::TYPE_VOIDP,  # hRegistration : void** out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "winhttp")]
extern "system" {
    fn WinHttpRegisterProxyChangeNotification(
        ullFlags: u64,  // ULONGLONG
        pfnCallback: *const core::ffi::c_void,  // WINHTTP_PROXY_CHANGE_CALLBACK
        pvContext: *mut (),  // void*
        hRegistration: *mut *mut ()  // void** out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WINHTTP.dll")]
public static extern uint WinHttpRegisterProxyChangeNotification(ulong ullFlags, IntPtr pfnCallback, IntPtr pvContext, IntPtr hRegistration);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINHTTP_WinHttpRegisterProxyChangeNotification' -Namespace Win32 -PassThru
# $api::WinHttpRegisterProxyChangeNotification(ullFlags, pfnCallback, pvContext, hRegistration)

#uselib "WINHTTP.dll"
#func global WinHttpRegisterProxyChangeNotification "WinHttpRegisterProxyChangeNotification" sptr, sptr, sptr, sptr
; WinHttpRegisterProxyChangeNotification ullFlags, pfnCallback, pvContext, hRegistration   ; 戻り値は stat
; ullFlags : ULONGLONG -> "sptr"
; pfnCallback : WINHTTP_PROXY_CHANGE_CALLBACK -> "sptr"
; pvContext : void* -> "sptr"
; hRegistration : void** out -> "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 WinHttpRegisterProxyChangeNotification "WinHttpRegisterProxyChangeNotification" int64, sptr, sptr, sptr
; res = WinHttpRegisterProxyChangeNotification(ullFlags, pfnCallback, pvContext, hRegistration)
; ullFlags : ULONGLONG -> "int64"
; pfnCallback : WINHTTP_PROXY_CHANGE_CALLBACK -> "sptr"
; pvContext : void* -> "sptr"
; hRegistration : void** out -> "sptr"
; ※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 WinHttpRegisterProxyChangeNotification(ULONGLONG ullFlags, WINHTTP_PROXY_CHANGE_CALLBACK pfnCallback, void* pvContext, void** hRegistration)
#uselib "WINHTTP.dll"
#cfunc global WinHttpRegisterProxyChangeNotification "WinHttpRegisterProxyChangeNotification" int64, intptr, intptr, intptr
; res = WinHttpRegisterProxyChangeNotification(ullFlags, pfnCallback, pvContext, hRegistration)
; ullFlags : ULONGLONG -> "int64"
; pfnCallback : WINHTTP_PROXY_CHANGE_CALLBACK -> "intptr"
; pvContext : void* -> "intptr"
; hRegistration : void** out -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	winhttp = windows.NewLazySystemDLL("WINHTTP.dll")
	procWinHttpRegisterProxyChangeNotification = winhttp.NewProc("WinHttpRegisterProxyChangeNotification")
)

// ullFlags (ULONGLONG), pfnCallback (WINHTTP_PROXY_CHANGE_CALLBACK), pvContext (void*), hRegistration (void** out)
r1, _, err := procWinHttpRegisterProxyChangeNotification.Call(
	uintptr(ullFlags),
	uintptr(pfnCallback),
	uintptr(pvContext),
	uintptr(hRegistration),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function WinHttpRegisterProxyChangeNotification(
  ullFlags: UInt64;   // ULONGLONG
  pfnCallback: Pointer;   // WINHTTP_PROXY_CHANGE_CALLBACK
  pvContext: Pointer;   // void*
  hRegistration: Pointer   // void** out
): DWORD; stdcall;
  external 'WINHTTP.dll' name 'WinHttpRegisterProxyChangeNotification';

result := DllCall("WINHTTP\WinHttpRegisterProxyChangeNotification"
    , "Int64", ullFlags   ; ULONGLONG
    , "Ptr", pfnCallback   ; WINHTTP_PROXY_CHANGE_CALLBACK
    , "Ptr", pvContext   ; void*
    , "Ptr", hRegistration   ; void** out
    , "UInt")   ; return: DWORD

●WinHttpRegisterProxyChangeNotification(ullFlags, pfnCallback, pvContext, hRegistration) = DLL("WINHTTP.dll", "dword WinHttpRegisterProxyChangeNotification(qword, void*, void*, void*)")
# 呼び出し: WinHttpRegisterProxyChangeNotification(ullFlags, pfnCallback, pvContext, hRegistration)
# ullFlags : ULONGLONG -> "qword"
# pfnCallback : WINHTTP_PROXY_CHANGE_CALLBACK -> "void*"
# pvContext : void* -> "void*"
# hRegistration : void** 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)。