WinHttpQueryDataAvailable

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

BOOL WinHttpQueryDataAvailable(
    void* hRequest,
    DWORD* lpdwNumberOfBytesAvailable
);

<DllImport("WINHTTP.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WinHttpQueryDataAvailable(
    hRequest As IntPtr,   ' void* in/out
    ByRef lpdwNumberOfBytesAvailable As UInteger   ' DWORD* in/out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hRequest : void* in/out
' lpdwNumberOfBytesAvailable : DWORD* in/out
Declare PtrSafe Function WinHttpQueryDataAvailable Lib "winhttp" ( _
    ByVal hRequest As LongPtr, _
    ByRef lpdwNumberOfBytesAvailable 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

WinHttpQueryDataAvailable = ctypes.windll.winhttp.WinHttpQueryDataAvailable
WinHttpQueryDataAvailable.restype = wintypes.BOOL
WinHttpQueryDataAvailable.argtypes = [
    ctypes.POINTER(None),  # hRequest : void* in/out
    ctypes.POINTER(wintypes.DWORD),  # lpdwNumberOfBytesAvailable : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINHTTP.dll')
WinHttpQueryDataAvailable = Fiddle::Function.new(
  lib['WinHttpQueryDataAvailable'],
  [
    Fiddle::TYPE_VOIDP,  # hRequest : void* in/out
    Fiddle::TYPE_VOIDP,  # lpdwNumberOfBytesAvailable : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "winhttp")]
extern "system" {
    fn WinHttpQueryDataAvailable(
        hRequest: *mut (),  // void* in/out
        lpdwNumberOfBytesAvailable: *mut u32  // DWORD* 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 WinHttpQueryDataAvailable(IntPtr hRequest, ref uint lpdwNumberOfBytesAvailable);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINHTTP_WinHttpQueryDataAvailable' -Namespace Win32 -PassThru
# $api::WinHttpQueryDataAvailable(hRequest, lpdwNumberOfBytesAvailable)

#uselib "WINHTTP.dll"
#func global WinHttpQueryDataAvailable "WinHttpQueryDataAvailable" sptr, sptr
; WinHttpQueryDataAvailable hRequest, varptr(lpdwNumberOfBytesAvailable)   ; 戻り値は stat
; hRequest : void* in/out -> "sptr"
; lpdwNumberOfBytesAvailable : DWORD* 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。

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

var (
	winhttp = windows.NewLazySystemDLL("WINHTTP.dll")
	procWinHttpQueryDataAvailable = winhttp.NewProc("WinHttpQueryDataAvailable")
)

// hRequest (void* in/out), lpdwNumberOfBytesAvailable (DWORD* in/out)
r1, _, err := procWinHttpQueryDataAvailable.Call(
	uintptr(hRequest),
	uintptr(lpdwNumberOfBytesAvailable),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function WinHttpQueryDataAvailable(
  hRequest: Pointer;   // void* in/out
  lpdwNumberOfBytesAvailable: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'WINHTTP.dll' name 'WinHttpQueryDataAvailable';

result := DllCall("WINHTTP\WinHttpQueryDataAvailable"
    , "Ptr", hRequest   ; void* in/out
    , "Ptr", lpdwNumberOfBytesAvailable   ; DWORD* in/out
    , "Int")   ; return: BOOL

●WinHttpQueryDataAvailable(hRequest, lpdwNumberOfBytesAvailable) = DLL("WINHTTP.dll", "bool WinHttpQueryDataAvailable(void*, void*)")
# 呼び出し: WinHttpQueryDataAvailable(hRequest, lpdwNumberOfBytesAvailable)
# hRequest : void* in/out -> "void*"
# lpdwNumberOfBytesAvailable : DWORD* 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)。

const std = @import("std");

extern "winhttp" fn WinHttpQueryDataAvailable(
    hRequest: ?*anyopaque, // void* in/out
    lpdwNumberOfBytesAvailable: [*c]u32 // DWORD* in/out
) callconv(std.os.windows.WINAPI) i32;

proc WinHttpQueryDataAvailable(
    hRequest: pointer,  # void* in/out
    lpdwNumberOfBytesAvailable: ptr uint32  # DWORD* in/out
): int32 {.importc: "WinHttpQueryDataAvailable", stdcall, dynlib: "WINHTTP.dll".}

pragma(lib, "winhttp");
extern(Windows)
int WinHttpQueryDataAvailable(
    void* hRequest,   // void* in/out
    uint* lpdwNumberOfBytesAvailable   // DWORD* in/out
);

ccall((:WinHttpQueryDataAvailable, "WINHTTP.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Ptr{UInt32}),
      hRequest, lpdwNumberOfBytesAvailable)
# hRequest : void* in/out -> Ptr{Cvoid}
# lpdwNumberOfBytesAvailable : DWORD* in/out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t WinHttpQueryDataAvailable(
    void* hRequest,
    uint32_t* lpdwNumberOfBytesAvailable);
]]
local winhttp = ffi.load("winhttp")
-- winhttp.WinHttpQueryDataAvailable(hRequest, lpdwNumberOfBytesAvailable)
-- hRequest : void* in/out
-- lpdwNumberOfBytesAvailable : DWORD* in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('WINHTTP.dll');
const WinHttpQueryDataAvailable = lib.func('__stdcall', 'WinHttpQueryDataAvailable', 'int32_t', ['void *', 'uint32_t *']);
// WinHttpQueryDataAvailable(hRequest, lpdwNumberOfBytesAvailable)
// hRequest : void* in/out -> 'void *'
// lpdwNumberOfBytesAvailable : DWORD* in/out -> 'uint32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("WINHTTP.dll", {
  WinHttpQueryDataAvailable: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.WinHttpQueryDataAvailable(hRequest, lpdwNumberOfBytesAvailable)
// hRequest : void* in/out -> "pointer"
// lpdwNumberOfBytesAvailable : DWORD* in/out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t WinHttpQueryDataAvailable(
    void* hRequest,
    uint32_t* lpdwNumberOfBytesAvailable);
C, "WINHTTP.dll");
// $ffi->WinHttpQueryDataAvailable(hRequest, lpdwNumberOfBytesAvailable);
// hRequest : void* in/out
// lpdwNumberOfBytesAvailable : DWORD* in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Winhttp extends StdCallLibrary {
    Winhttp INSTANCE = Native.load("winhttp", Winhttp.class);
    boolean WinHttpQueryDataAvailable(
        Pointer hRequest,   // void* in/out
        IntByReference lpdwNumberOfBytesAvailable   // DWORD* in/out
    );
}

@[Link("winhttp")]
lib LibWINHTTP
  fun WinHttpQueryDataAvailable = WinHttpQueryDataAvailable(
    hRequest : Void*,   # void* in/out
    lpdwNumberOfBytesAvailable : UInt32*   # DWORD* in/out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef WinHttpQueryDataAvailableNative = Int32 Function(Pointer<Void>, Pointer<Uint32>);
typedef WinHttpQueryDataAvailableDart = int Function(Pointer<Void>, Pointer<Uint32>);
final WinHttpQueryDataAvailable = DynamicLibrary.open('WINHTTP.dll')
    .lookupFunction<WinHttpQueryDataAvailableNative, WinHttpQueryDataAvailableDart>('WinHttpQueryDataAvailable');
// hRequest : void* in/out -> Pointer<Void>
// lpdwNumberOfBytesAvailable : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function WinHttpQueryDataAvailable(
  hRequest: Pointer;   // void* in/out
  lpdwNumberOfBytesAvailable: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'WINHTTP.dll' name 'WinHttpQueryDataAvailable';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "WinHttpQueryDataAvailable"
  c_WinHttpQueryDataAvailable :: Ptr () -> Ptr Word32 -> IO CInt
-- hRequest : void* in/out -> Ptr ()
-- lpdwNumberOfBytesAvailable : DWORD* in/out -> Ptr Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let winhttpquerydataavailable =
  foreign "WinHttpQueryDataAvailable"
    ((ptr void) @-> (ptr uint32_t) @-> returning int32_t)
(* hRequest : void* in/out -> (ptr void) *)
(* lpdwNumberOfBytesAvailable : DWORD* in/out -> (ptr uint32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library winhttp (t "WINHTTP.dll"))
(cffi:use-foreign-library winhttp)

(cffi:defcfun ("WinHttpQueryDataAvailable" win-http-query-data-available :convention :stdcall) :int32
  (h-request :pointer)   ; void* in/out
  (lpdw-number-of-bytes-available :pointer))   ; DWORD* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $WinHttpQueryDataAvailable = Win32::API::More->new('WINHTTP',
    'BOOL WinHttpQueryDataAvailable(LPVOID hRequest, LPVOID lpdwNumberOfBytesAvailable)');
# my $ret = $WinHttpQueryDataAvailable->Call($hRequest, $lpdwNumberOfBytesAvailable);
# hRequest : void* in/out -> LPVOID
# lpdwNumberOfBytesAvailable : DWORD* in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。