FtpOpenFileW

// WININET.dll  (Unicode / -W)
#include <windows.h>

void* FtpOpenFileW(
    void* hConnect,
    LPCWSTR lpszFileName,
    DWORD dwAccess,
    FTP_FLAGS dwFlags,
    UINT_PTR dwContext   // optional
);

<DllImport("WININET.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FtpOpenFileW(
    hConnect As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPWStr)> lpszFileName As String,   ' LPCWSTR
    dwAccess As UInteger,   ' DWORD
    dwFlags As UInteger,   ' FTP_FLAGS
    dwContext As UIntPtr   ' UINT_PTR optional
) As IntPtr
End Function

' hConnect : void*
' lpszFileName : LPCWSTR
' dwAccess : DWORD
' dwFlags : FTP_FLAGS
' dwContext : UINT_PTR optional
Declare PtrSafe Function FtpOpenFileW Lib "wininet" ( _
    ByVal hConnect As LongPtr, _
    ByVal lpszFileName As LongPtr, _
    ByVal dwAccess As Long, _
    ByVal dwFlags As Long, _
    ByVal dwContext As LongPtr) As LongPtr
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

FtpOpenFileW = ctypes.windll.wininet.FtpOpenFileW
FtpOpenFileW.restype = ctypes.c_void_p
FtpOpenFileW.argtypes = [
    ctypes.POINTER(None),  # hConnect : void*
    wintypes.LPCWSTR,  # lpszFileName : LPCWSTR
    wintypes.DWORD,  # dwAccess : DWORD
    wintypes.DWORD,  # dwFlags : FTP_FLAGS
    ctypes.c_size_t,  # dwContext : UINT_PTR optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
FtpOpenFileW = Fiddle::Function.new(
  lib['FtpOpenFileW'],
  [
    Fiddle::TYPE_VOIDP,  # hConnect : void*
    Fiddle::TYPE_VOIDP,  # lpszFileName : LPCWSTR
    -Fiddle::TYPE_INT,  # dwAccess : DWORD
    -Fiddle::TYPE_INT,  # dwFlags : FTP_FLAGS
    Fiddle::TYPE_UINTPTR_T,  # dwContext : UINT_PTR optional
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "wininet")]
extern "system" {
    fn FtpOpenFileW(
        hConnect: *mut (),  // void*
        lpszFileName: *const u16,  // LPCWSTR
        dwAccess: u32,  // DWORD
        dwFlags: u32,  // FTP_FLAGS
        dwContext: usize  // UINT_PTR optional
    ) -> *mut ();
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WININET.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr FtpOpenFileW(IntPtr hConnect, [MarshalAs(UnmanagedType.LPWStr)] string lpszFileName, uint dwAccess, uint dwFlags, UIntPtr dwContext);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_FtpOpenFileW' -Namespace Win32 -PassThru
# $api::FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext)

#uselib "WININET.dll"
#func global FtpOpenFileW "FtpOpenFileW" wptr, wptr, wptr, wptr, wptr
; FtpOpenFileW hConnect, lpszFileName, dwAccess, dwFlags, dwContext   ; 戻り値は stat
; hConnect : void* -> "wptr"
; lpszFileName : LPCWSTR -> "wptr"
; dwAccess : DWORD -> "wptr"
; dwFlags : FTP_FLAGS -> "wptr"
; dwContext : UINT_PTR optional -> "wptr"
; ※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 FtpOpenFileW "FtpOpenFileW" sptr, wstr, int, int, sptr
; res = FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext)
; hConnect : void* -> "sptr"
; lpszFileName : LPCWSTR -> "wstr"
; dwAccess : DWORD -> "int"
; dwFlags : FTP_FLAGS -> "int"
; dwContext : UINT_PTR optional -> "sptr"

; void* FtpOpenFileW(void* hConnect, LPCWSTR lpszFileName, DWORD dwAccess, FTP_FLAGS dwFlags, UINT_PTR dwContext)
#uselib "WININET.dll"
#cfunc global FtpOpenFileW "FtpOpenFileW" intptr, wstr, int, int, intptr
; res = FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext)
; hConnect : void* -> "intptr"
; lpszFileName : LPCWSTR -> "wstr"
; dwAccess : DWORD -> "int"
; dwFlags : FTP_FLAGS -> "int"
; dwContext : UINT_PTR optional -> "intptr"

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procFtpOpenFileW = wininet.NewProc("FtpOpenFileW")
)

// hConnect (void*), lpszFileName (LPCWSTR), dwAccess (DWORD), dwFlags (FTP_FLAGS), dwContext (UINT_PTR optional)
r1, _, err := procFtpOpenFileW.Call(
	uintptr(hConnect),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszFileName))),
	uintptr(dwAccess),
	uintptr(dwFlags),
	uintptr(dwContext),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void*

function FtpOpenFileW(
  hConnect: Pointer;   // void*
  lpszFileName: PWideChar;   // LPCWSTR
  dwAccess: DWORD;   // DWORD
  dwFlags: DWORD;   // FTP_FLAGS
  dwContext: NativeUInt   // UINT_PTR optional
): Pointer; stdcall;
  external 'WININET.dll' name 'FtpOpenFileW';

result := DllCall("WININET\FtpOpenFileW"
    , "Ptr", hConnect   ; void*
    , "WStr", lpszFileName   ; LPCWSTR
    , "UInt", dwAccess   ; DWORD
    , "UInt", dwFlags   ; FTP_FLAGS
    , "UPtr", dwContext   ; UINT_PTR optional
    , "Ptr")   ; return: void*

●FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext) = DLL("WININET.dll", "void* FtpOpenFileW(void*, char*, dword, dword, int)")
# 呼び出し: FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext)
# hConnect : void* -> "void*"
# lpszFileName : LPCWSTR -> "char*"
# dwAccess : DWORD -> "dword"
# dwFlags : FTP_FLAGS -> "dword"
# dwContext : UINT_PTR optional -> "int"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。

const std = @import("std");

extern "wininet" fn FtpOpenFileW(
    hConnect: ?*anyopaque, // void*
    lpszFileName: [*c]const u16, // LPCWSTR
    dwAccess: u32, // DWORD
    dwFlags: u32, // FTP_FLAGS
    dwContext: usize // UINT_PTR optional
) callconv(std.os.windows.WINAPI) ?*anyopaque;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc FtpOpenFileW(
    hConnect: pointer,  # void*
    lpszFileName: WideCString,  # LPCWSTR
    dwAccess: uint32,  # DWORD
    dwFlags: uint32,  # FTP_FLAGS
    dwContext: uint  # UINT_PTR optional
): pointer {.importc: "FtpOpenFileW", stdcall, dynlib: "WININET.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "wininet");
extern(Windows)
void* FtpOpenFileW(
    void* hConnect,   // void*
    const(wchar)* lpszFileName,   // LPCWSTR
    uint dwAccess,   // DWORD
    uint dwFlags,   // FTP_FLAGS
    size_t dwContext   // UINT_PTR optional
);

ccall((:FtpOpenFileW, "WININET.dll"), stdcall, Ptr{Cvoid},
      (Ptr{Cvoid}, Cwstring, UInt32, UInt32, Csize_t),
      hConnect, lpszFileName, dwAccess, dwFlags, dwContext)
# hConnect : void* -> Ptr{Cvoid}
# lpszFileName : LPCWSTR -> Cwstring
# dwAccess : DWORD -> UInt32
# dwFlags : FTP_FLAGS -> UInt32
# dwContext : UINT_PTR optional -> Csize_t
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
void* FtpOpenFileW(
    void* hConnect,
    const uint16_t* lpszFileName,
    uint32_t dwAccess,
    uint32_t dwFlags,
    uintptr_t dwContext);
]]
local wininet = ffi.load("wininet")
-- wininet.FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext)
-- hConnect : void*
-- lpszFileName : LPCWSTR
-- dwAccess : DWORD
-- dwFlags : FTP_FLAGS
-- dwContext : UINT_PTR optional
-- 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。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('WININET.dll');
const FtpOpenFileW = lib.func('__stdcall', 'FtpOpenFileW', 'void *', ['void *', 'str16', 'uint32_t', 'uint32_t', 'uintptr_t']);
// FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext)
// hConnect : void* -> 'void *'
// lpszFileName : LPCWSTR -> 'str16'
// dwAccess : DWORD -> 'uint32_t'
// dwFlags : FTP_FLAGS -> 'uint32_t'
// dwContext : UINT_PTR optional -> 'uintptr_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("WININET.dll", {
  FtpOpenFileW: { parameters: ["pointer", "buffer", "u32", "u32", "usize"], result: "pointer" },
});
// lib.symbols.FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext)
// hConnect : void* -> "pointer"
// lpszFileName : LPCWSTR -> "buffer"
// dwAccess : DWORD -> "u32"
// dwFlags : FTP_FLAGS -> "u32"
// dwContext : UINT_PTR optional -> "usize"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)を Uint8Array で渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
void* FtpOpenFileW(
    void* hConnect,
    const uint16_t* lpszFileName,
    uint32_t dwAccess,
    uint32_t dwFlags,
    size_t dwContext);
C, "WININET.dll");
// $ffi->FtpOpenFileW(hConnect, lpszFileName, dwAccess, dwFlags, dwContext);
// hConnect : void*
// lpszFileName : LPCWSTR
// dwAccess : DWORD
// dwFlags : FTP_FLAGS
// dwContext : UINT_PTR optional
// 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 Wininet extends StdCallLibrary {
    Wininet INSTANCE = Native.load("wininet", Wininet.class, W32APIOptions.UNICODE_OPTIONS);
    Pointer FtpOpenFileW(
        Pointer hConnect,   // void*
        WString lpszFileName,   // LPCWSTR
        int dwAccess,   // DWORD
        int dwFlags,   // FTP_FLAGS
        long dwContext   // UINT_PTR optional
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("wininet")]
lib LibWININET
  fun FtpOpenFileW = FtpOpenFileW(
    hConnect : Void*,   # void*
    lpszFileName : UInt16*,   # LPCWSTR
    dwAccess : UInt32,   # DWORD
    dwFlags : UInt32,   # FTP_FLAGS
    dwContext : LibC::SizeT   # UINT_PTR optional
  ) : Void*
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 FtpOpenFileWNative = Pointer<Void> Function(Pointer<Void>, Pointer<Utf16>, Uint32, Uint32, UintPtr);
typedef FtpOpenFileWDart = Pointer<Void> Function(Pointer<Void>, Pointer<Utf16>, int, int, int);
final FtpOpenFileW = DynamicLibrary.open('WININET.dll')
    .lookupFunction<FtpOpenFileWNative, FtpOpenFileWDart>('FtpOpenFileW');
// hConnect : void* -> Pointer<Void>
// lpszFileName : LPCWSTR -> Pointer<Utf16>
// dwAccess : DWORD -> Uint32
// dwFlags : FTP_FLAGS -> Uint32
// dwContext : UINT_PTR optional -> UintPtr
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function FtpOpenFileW(
  hConnect: Pointer;   // void*
  lpszFileName: PWideChar;   // LPCWSTR
  dwAccess: DWORD;   // DWORD
  dwFlags: DWORD;   // FTP_FLAGS
  dwContext: NativeUInt   // UINT_PTR optional
): Pointer; stdcall;
  external 'WININET.dll' name 'FtpOpenFileW';

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

foreign import stdcall safe "FtpOpenFileW"
  c_FtpOpenFileW :: Ptr () -> CWString -> Word32 -> Word32 -> CUIntPtr -> IO (Ptr ())
-- hConnect : void* -> Ptr ()
-- lpszFileName : LPCWSTR -> CWString
-- dwAccess : DWORD -> Word32
-- dwFlags : FTP_FLAGS -> Word32
-- dwContext : UINT_PTR optional -> CUIntPtr
-- 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 ftpopenfilew =
  foreign "FtpOpenFileW"
    ((ptr void) @-> (ptr uint16_t) @-> uint32_t @-> uint32_t @-> size_t @-> returning (ptr void))
(* hConnect : void* -> (ptr void) *)
(* lpszFileName : LPCWSTR -> (ptr uint16_t) *)
(* dwAccess : DWORD -> uint32_t *)
(* dwFlags : FTP_FLAGS -> uint32_t *)
(* dwContext : UINT_PTR optional -> size_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 wininet (t "WININET.dll"))
(cffi:use-foreign-library wininet)

(cffi:defcfun ("FtpOpenFileW" ftp-open-file-w :convention :stdcall) :pointer
  (h-connect :pointer)   ; void*
  (lpsz-file-name (:string :encoding :utf-16le))   ; LPCWSTR
  (dw-access :uint32)   ; DWORD
  (dw-flags :uint32)   ; FTP_FLAGS
  (dw-context :uint64))   ; UINT_PTR optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $FtpOpenFileW = Win32::API::More->new('WININET',
    'LPVOID FtpOpenFileW(LPVOID hConnect, LPCWSTR lpszFileName, DWORD dwAccess, DWORD dwFlags, WPARAM dwContext)');
# my $ret = $FtpOpenFileW->Call($hConnect, $lpszFileName, $dwAccess, $dwFlags, $dwContext);
# hConnect : void* -> LPVOID
# lpszFileName : LPCWSTR -> LPCWSTR
# dwAccess : DWORD -> DWORD
# dwFlags : FTP_FLAGS -> DWORD
# dwContext : UINT_PTR optional -> WPARAM
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。