FtpGetFileW

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

BOOL FtpGetFileW(
    void* hConnect,
    LPCWSTR lpszRemoteFile,
    LPCWSTR lpszNewFile,
    BOOL fFailIfExists,
    DWORD dwFlagsAndAttributes,
    DWORD dwFlags,
    UINT_PTR dwContext   // optional
);

<DllImport("WININET.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FtpGetFileW(
    hConnect As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPWStr)> lpszRemoteFile As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpszNewFile As String,   ' LPCWSTR
    fFailIfExists As Boolean,   ' BOOL
    dwFlagsAndAttributes As UInteger,   ' DWORD
    dwFlags As UInteger,   ' DWORD
    dwContext As UIntPtr   ' UINT_PTR optional
) As Boolean
End Function

' hConnect : void*
' lpszRemoteFile : LPCWSTR
' lpszNewFile : LPCWSTR
' fFailIfExists : BOOL
' dwFlagsAndAttributes : DWORD
' dwFlags : DWORD
' dwContext : UINT_PTR optional
Declare PtrSafe Function FtpGetFileW Lib "wininet" ( _
    ByVal hConnect As LongPtr, _
    ByVal lpszRemoteFile As LongPtr, _
    ByVal lpszNewFile As LongPtr, _
    ByVal fFailIfExists As Long, _
    ByVal dwFlagsAndAttributes As Long, _
    ByVal dwFlags As Long, _
    ByVal dwContext As LongPtr) As Long
' 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

FtpGetFileW = ctypes.windll.wininet.FtpGetFileW
FtpGetFileW.restype = wintypes.BOOL
FtpGetFileW.argtypes = [
    ctypes.POINTER(None),  # hConnect : void*
    wintypes.LPCWSTR,  # lpszRemoteFile : LPCWSTR
    wintypes.LPCWSTR,  # lpszNewFile : LPCWSTR
    wintypes.BOOL,  # fFailIfExists : BOOL
    wintypes.DWORD,  # dwFlagsAndAttributes : DWORD
    wintypes.DWORD,  # dwFlags : DWORD
    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')
FtpGetFileW = Fiddle::Function.new(
  lib['FtpGetFileW'],
  [
    Fiddle::TYPE_VOIDP,  # hConnect : void*
    Fiddle::TYPE_VOIDP,  # lpszRemoteFile : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpszNewFile : LPCWSTR
    Fiddle::TYPE_INT,  # fFailIfExists : BOOL
    -Fiddle::TYPE_INT,  # dwFlagsAndAttributes : DWORD
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_UINTPTR_T,  # dwContext : UINT_PTR optional
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "wininet")]
extern "system" {
    fn FtpGetFileW(
        hConnect: *mut (),  // void*
        lpszRemoteFile: *const u16,  // LPCWSTR
        lpszNewFile: *const u16,  // LPCWSTR
        fFailIfExists: i32,  // BOOL
        dwFlagsAndAttributes: u32,  // DWORD
        dwFlags: u32,  // DWORD
        dwContext: usize  // UINT_PTR optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WININET.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool FtpGetFileW(IntPtr hConnect, [MarshalAs(UnmanagedType.LPWStr)] string lpszRemoteFile, [MarshalAs(UnmanagedType.LPWStr)] string lpszNewFile, bool fFailIfExists, uint dwFlagsAndAttributes, uint dwFlags, UIntPtr dwContext);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_FtpGetFileW' -Namespace Win32 -PassThru
# $api::FtpGetFileW(hConnect, lpszRemoteFile, lpszNewFile, fFailIfExists, dwFlagsAndAttributes, dwFlags, dwContext)

#uselib "WININET.dll"
#func global FtpGetFileW "FtpGetFileW" wptr, wptr, wptr, wptr, wptr, wptr, wptr
; FtpGetFileW hConnect, lpszRemoteFile, lpszNewFile, fFailIfExists, dwFlagsAndAttributes, dwFlags, dwContext   ; 戻り値は stat
; hConnect : void* -> "wptr"
; lpszRemoteFile : LPCWSTR -> "wptr"
; lpszNewFile : LPCWSTR -> "wptr"
; fFailIfExists : BOOL -> "wptr"
; dwFlagsAndAttributes : DWORD -> "wptr"
; dwFlags : DWORD -> "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 FtpGetFileW "FtpGetFileW" sptr, wstr, wstr, int, int, int, sptr
; res = FtpGetFileW(hConnect, lpszRemoteFile, lpszNewFile, fFailIfExists, dwFlagsAndAttributes, dwFlags, dwContext)
; hConnect : void* -> "sptr"
; lpszRemoteFile : LPCWSTR -> "wstr"
; lpszNewFile : LPCWSTR -> "wstr"
; fFailIfExists : BOOL -> "int"
; dwFlagsAndAttributes : DWORD -> "int"
; dwFlags : DWORD -> "int"
; dwContext : UINT_PTR optional -> "sptr"

; BOOL FtpGetFileW(void* hConnect, LPCWSTR lpszRemoteFile, LPCWSTR lpszNewFile, BOOL fFailIfExists, DWORD dwFlagsAndAttributes, DWORD dwFlags, UINT_PTR dwContext)
#uselib "WININET.dll"
#cfunc global FtpGetFileW "FtpGetFileW" intptr, wstr, wstr, int, int, int, intptr
; res = FtpGetFileW(hConnect, lpszRemoteFile, lpszNewFile, fFailIfExists, dwFlagsAndAttributes, dwFlags, dwContext)
; hConnect : void* -> "intptr"
; lpszRemoteFile : LPCWSTR -> "wstr"
; lpszNewFile : LPCWSTR -> "wstr"
; fFailIfExists : BOOL -> "int"
; dwFlagsAndAttributes : DWORD -> "int"
; dwFlags : DWORD -> "int"
; dwContext : UINT_PTR optional -> "intptr"

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procFtpGetFileW = wininet.NewProc("FtpGetFileW")
)

// hConnect (void*), lpszRemoteFile (LPCWSTR), lpszNewFile (LPCWSTR), fFailIfExists (BOOL), dwFlagsAndAttributes (DWORD), dwFlags (DWORD), dwContext (UINT_PTR optional)
r1, _, err := procFtpGetFileW.Call(
	uintptr(hConnect),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszRemoteFile))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszNewFile))),
	uintptr(fFailIfExists),
	uintptr(dwFlagsAndAttributes),
	uintptr(dwFlags),
	uintptr(dwContext),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function FtpGetFileW(
  hConnect: Pointer;   // void*
  lpszRemoteFile: PWideChar;   // LPCWSTR
  lpszNewFile: PWideChar;   // LPCWSTR
  fFailIfExists: BOOL;   // BOOL
  dwFlagsAndAttributes: DWORD;   // DWORD
  dwFlags: DWORD;   // DWORD
  dwContext: NativeUInt   // UINT_PTR optional
): BOOL; stdcall;
  external 'WININET.dll' name 'FtpGetFileW';

result := DllCall("WININET\FtpGetFileW"
    , "Ptr", hConnect   ; void*
    , "WStr", lpszRemoteFile   ; LPCWSTR
    , "WStr", lpszNewFile   ; LPCWSTR
    , "Int", fFailIfExists   ; BOOL
    , "UInt", dwFlagsAndAttributes   ; DWORD
    , "UInt", dwFlags   ; DWORD
    , "UPtr", dwContext   ; UINT_PTR optional
    , "Int")   ; return: BOOL

●FtpGetFileW(hConnect, lpszRemoteFile, lpszNewFile, fFailIfExists, dwFlagsAndAttributes, dwFlags, dwContext) = DLL("WININET.dll", "bool FtpGetFileW(void*, char*, char*, bool, dword, dword, int)")
# 呼び出し: FtpGetFileW(hConnect, lpszRemoteFile, lpszNewFile, fFailIfExists, dwFlagsAndAttributes, dwFlags, dwContext)
# hConnect : void* -> "void*"
# lpszRemoteFile : LPCWSTR -> "char*"
# lpszNewFile : LPCWSTR -> "char*"
# fFailIfExists : BOOL -> "bool"
# dwFlagsAndAttributes : DWORD -> "dword"
# dwFlags : DWORD -> "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。