HttpGetExtension

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

DWORD HttpGetExtension(
    HTTPAPI_VERSION Version,
    DWORD Extension,
    void* Buffer,
    DWORD BufferSize
);

<DllImport("HTTPAPI.dll", ExactSpelling:=True)>
Public Shared Function HttpGetExtension(
    Version As HTTPAPI_VERSION,   ' HTTPAPI_VERSION
    Extension As UInteger,   ' DWORD
    Buffer As IntPtr,   ' void* out
    BufferSize As UInteger   ' DWORD
) As UInteger
End Function

' Version : HTTPAPI_VERSION
' Extension : DWORD
' Buffer : void* out
' BufferSize : DWORD
Declare PtrSafe Function HttpGetExtension Lib "httpapi" ( _
    ByVal Version As LongPtr, _
    ByVal Extension As Long, _
    ByVal Buffer As LongPtr, _
    ByVal BufferSize As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

HttpGetExtension = ctypes.windll.httpapi.HttpGetExtension
HttpGetExtension.restype = wintypes.DWORD
HttpGetExtension.argtypes = [
    HTTPAPI_VERSION,  # Version : HTTPAPI_VERSION
    wintypes.DWORD,  # Extension : DWORD
    ctypes.POINTER(None),  # Buffer : void* out
    wintypes.DWORD,  # BufferSize : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('HTTPAPI.dll')
HttpGetExtension = Fiddle::Function.new(
  lib['HttpGetExtension'],
  [
    Fiddle::TYPE_VOIDP,  # Version : HTTPAPI_VERSION
    -Fiddle::TYPE_INT,  # Extension : DWORD
    Fiddle::TYPE_VOIDP,  # Buffer : void* out
    -Fiddle::TYPE_INT,  # BufferSize : DWORD
  ],
  -Fiddle::TYPE_INT)

#[link(name = "httpapi")]
extern "system" {
    fn HttpGetExtension(
        Version: HTTPAPI_VERSION,  // HTTPAPI_VERSION
        Extension: u32,  // DWORD
        Buffer: *mut (),  // void* out
        BufferSize: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("HTTPAPI.dll")]
public static extern uint HttpGetExtension(HTTPAPI_VERSION Version, uint Extension, IntPtr Buffer, uint BufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'HTTPAPI_HttpGetExtension' -Namespace Win32 -PassThru
# $api::HttpGetExtension(Version, Extension, Buffer, BufferSize)

#uselib "HTTPAPI.dll"
#func global HttpGetExtension "HttpGetExtension" sptr, sptr, sptr, sptr
; HttpGetExtension Version, Extension, Buffer, BufferSize   ; 戻り値は stat
; Version : HTTPAPI_VERSION -> "sptr"
; Extension : DWORD -> "sptr"
; Buffer : void* out -> "sptr"
; BufferSize : DWORD -> "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 HttpGetExtension "HttpGetExtension" int, int, sptr, int
; res = HttpGetExtension(Version, Extension, Buffer, BufferSize)
; Version : HTTPAPI_VERSION -> "int"
; Extension : DWORD -> "int"
; Buffer : void* out -> "sptr"
; BufferSize : DWORD -> "int"
; ※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 HttpGetExtension(HTTPAPI_VERSION Version, DWORD Extension, void* Buffer, DWORD BufferSize)
#uselib "HTTPAPI.dll"
#cfunc global HttpGetExtension "HttpGetExtension" int, int, intptr, int
; res = HttpGetExtension(Version, Extension, Buffer, BufferSize)
; Version : HTTPAPI_VERSION -> "int"
; Extension : DWORD -> "int"
; Buffer : void* out -> "intptr"
; BufferSize : DWORD -> "int"
; ※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")
	procHttpGetExtension = httpapi.NewProc("HttpGetExtension")
)

// Version (HTTPAPI_VERSION), Extension (DWORD), Buffer (void* out), BufferSize (DWORD)
r1, _, err := procHttpGetExtension.Call(
	uintptr(Version),
	uintptr(Extension),
	uintptr(Buffer),
	uintptr(BufferSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function HttpGetExtension(
  Version: HTTPAPI_VERSION;   // HTTPAPI_VERSION
  Extension: DWORD;   // DWORD
  Buffer: Pointer;   // void* out
  BufferSize: DWORD   // DWORD
): DWORD; stdcall;
  external 'HTTPAPI.dll' name 'HttpGetExtension';

result := DllCall("HTTPAPI\HttpGetExtension"
    , "Ptr", Version   ; HTTPAPI_VERSION
    , "UInt", Extension   ; DWORD
    , "Ptr", Buffer   ; void* out
    , "UInt", BufferSize   ; DWORD
    , "UInt")   ; return: DWORD

●HttpGetExtension(Version, Extension, Buffer, BufferSize) = DLL("HTTPAPI.dll", "dword HttpGetExtension(void*, dword, void*, dword)")
# 呼び出し: HttpGetExtension(Version, Extension, Buffer, BufferSize)
# Version : HTTPAPI_VERSION -> "void*"
# Extension : DWORD -> "dword"
# Buffer : void* out -> "void*"
# BufferSize : DWORD -> "dword"
# 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)。