HttpInitialize

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

DWORD HttpInitialize(
    HTTPAPI_VERSION Version,
    HTTP_INITIALIZE Flags,
    void* pReserved   // optional
);

<DllImport("HTTPAPI.dll", ExactSpelling:=True)>
Public Shared Function HttpInitialize(
    Version As HTTPAPI_VERSION,   ' HTTPAPI_VERSION
    Flags As UInteger,   ' HTTP_INITIALIZE
    pReserved As IntPtr   ' void* optional, in/out
) As UInteger
End Function

' Version : HTTPAPI_VERSION
' Flags : HTTP_INITIALIZE
' pReserved : void* optional, in/out
Declare PtrSafe Function HttpInitialize Lib "httpapi" ( _
    ByVal Version As LongPtr, _
    ByVal Flags As Long, _
    ByVal pReserved 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

HttpInitialize = ctypes.windll.httpapi.HttpInitialize
HttpInitialize.restype = wintypes.DWORD
HttpInitialize.argtypes = [
    HTTPAPI_VERSION,  # Version : HTTPAPI_VERSION
    wintypes.DWORD,  # Flags : HTTP_INITIALIZE
    ctypes.POINTER(None),  # pReserved : void* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('HTTPAPI.dll')
HttpInitialize = Fiddle::Function.new(
  lib['HttpInitialize'],
  [
    Fiddle::TYPE_VOIDP,  # Version : HTTPAPI_VERSION
    -Fiddle::TYPE_INT,  # Flags : HTTP_INITIALIZE
    Fiddle::TYPE_VOIDP,  # pReserved : void* optional, in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "httpapi")]
extern "system" {
    fn HttpInitialize(
        Version: HTTPAPI_VERSION,  // HTTPAPI_VERSION
        Flags: u32,  // HTTP_INITIALIZE
        pReserved: *mut ()  // void* optional, in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("HTTPAPI.dll")]
public static extern uint HttpInitialize(HTTPAPI_VERSION Version, uint Flags, IntPtr pReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'HTTPAPI_HttpInitialize' -Namespace Win32 -PassThru
# $api::HttpInitialize(Version, Flags, pReserved)

#uselib "HTTPAPI.dll"
#func global HttpInitialize "HttpInitialize" sptr, sptr, sptr
; HttpInitialize Version, Flags, pReserved   ; 戻り値は stat
; Version : HTTPAPI_VERSION -> "sptr"
; Flags : HTTP_INITIALIZE -> "sptr"
; pReserved : void* optional, in/out -> "sptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 "HTTPAPI.dll"
#cfunc global HttpInitialize "HttpInitialize" int, int, sptr
; res = HttpInitialize(Version, Flags, pReserved)
; Version : HTTPAPI_VERSION -> "int"
; Flags : HTTP_INITIALIZE -> "int"
; pReserved : void* optional, in/out -> "sptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。

; DWORD HttpInitialize(HTTPAPI_VERSION Version, HTTP_INITIALIZE Flags, void* pReserved)
#uselib "HTTPAPI.dll"
#cfunc global HttpInitialize "HttpInitialize" int, int, intptr
; res = HttpInitialize(Version, Flags, pReserved)
; Version : HTTPAPI_VERSION -> "int"
; Flags : HTTP_INITIALIZE -> "int"
; pReserved : void* optional, in/out -> "intptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。

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

var (
	httpapi = windows.NewLazySystemDLL("HTTPAPI.dll")
	procHttpInitialize = httpapi.NewProc("HttpInitialize")
)

// Version (HTTPAPI_VERSION), Flags (HTTP_INITIALIZE), pReserved (void* optional, in/out)
r1, _, err := procHttpInitialize.Call(
	uintptr(Version),
	uintptr(Flags),
	uintptr(pReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function HttpInitialize(
  Version: HTTPAPI_VERSION;   // HTTPAPI_VERSION
  Flags: DWORD;   // HTTP_INITIALIZE
  pReserved: Pointer   // void* optional, in/out
): DWORD; stdcall;
  external 'HTTPAPI.dll' name 'HttpInitialize';

result := DllCall("HTTPAPI\HttpInitialize"
    , "Ptr", Version   ; HTTPAPI_VERSION
    , "UInt", Flags   ; HTTP_INITIALIZE
    , "Ptr", pReserved   ; void* optional, in/out
    , "UInt")   ; return: DWORD

●HttpInitialize(Version, Flags, pReserved) = DLL("HTTPAPI.dll", "dword HttpInitialize(void*, dword, void*)")
# 呼び出し: HttpInitialize(Version, Flags, pReserved)
# Version : HTTPAPI_VERSION -> "void*"
# Flags : HTTP_INITIALIZE -> "dword"
# pReserved : void* optional, 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)。