FtpGetFileSize

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

DWORD FtpGetFileSize(
    void* hFile,
    DWORD* lpdwFileSizeHigh   // optional
);

<DllImport("WININET.dll", ExactSpelling:=True)>
Public Shared Function FtpGetFileSize(
    hFile As IntPtr,   ' void*
    lpdwFileSizeHigh As IntPtr   ' DWORD* optional, out
) As UInteger
End Function

' hFile : void*
' lpdwFileSizeHigh : DWORD* optional, out
Declare PtrSafe Function FtpGetFileSize Lib "wininet" ( _
    ByVal hFile As LongPtr, _
    ByVal lpdwFileSizeHigh 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

FtpGetFileSize = ctypes.windll.wininet.FtpGetFileSize
FtpGetFileSize.restype = wintypes.DWORD
FtpGetFileSize.argtypes = [
    ctypes.POINTER(None),  # hFile : void*
    ctypes.POINTER(wintypes.DWORD),  # lpdwFileSizeHigh : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
FtpGetFileSize = Fiddle::Function.new(
  lib['FtpGetFileSize'],
  [
    Fiddle::TYPE_VOIDP,  # hFile : void*
    Fiddle::TYPE_VOIDP,  # lpdwFileSizeHigh : DWORD* optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "wininet")]
extern "system" {
    fn FtpGetFileSize(
        hFile: *mut (),  // void*
        lpdwFileSizeHigh: *mut u32  // DWORD* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WININET.dll")]
public static extern uint FtpGetFileSize(IntPtr hFile, IntPtr lpdwFileSizeHigh);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_FtpGetFileSize' -Namespace Win32 -PassThru
# $api::FtpGetFileSize(hFile, lpdwFileSizeHigh)

#uselib "WININET.dll"
#func global FtpGetFileSize "FtpGetFileSize" sptr, sptr
; FtpGetFileSize hFile, varptr(lpdwFileSizeHigh)   ; 戻り値は stat
; hFile : void* -> "sptr"
; lpdwFileSizeHigh : DWORD* optional, 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。

#uselib "WININET.dll"
#cfunc global FtpGetFileSize "FtpGetFileSize" sptr, var
; res = FtpGetFileSize(hFile, lpdwFileSizeHigh)
; hFile : void* -> "sptr"
; lpdwFileSizeHigh : DWORD* optional, out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; DWORD FtpGetFileSize(void* hFile, DWORD* lpdwFileSizeHigh)
#uselib "WININET.dll"
#cfunc global FtpGetFileSize "FtpGetFileSize" intptr, var
; res = FtpGetFileSize(hFile, lpdwFileSizeHigh)
; hFile : void* -> "intptr"
; lpdwFileSizeHigh : DWORD* optional, out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procFtpGetFileSize = wininet.NewProc("FtpGetFileSize")
)

// hFile (void*), lpdwFileSizeHigh (DWORD* optional, out)
r1, _, err := procFtpGetFileSize.Call(
	uintptr(hFile),
	uintptr(lpdwFileSizeHigh),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function FtpGetFileSize(
  hFile: Pointer;   // void*
  lpdwFileSizeHigh: Pointer   // DWORD* optional, out
): DWORD; stdcall;
  external 'WININET.dll' name 'FtpGetFileSize';

result := DllCall("WININET\FtpGetFileSize"
    , "Ptr", hFile   ; void*
    , "Ptr", lpdwFileSizeHigh   ; DWORD* optional, out
    , "UInt")   ; return: DWORD

●FtpGetFileSize(hFile, lpdwFileSizeHigh) = DLL("WININET.dll", "dword FtpGetFileSize(void*, void*)")
# 呼び出し: FtpGetFileSize(hFile, lpdwFileSizeHigh)
# hFile : void* -> "void*"
# lpdwFileSizeHigh : DWORD* optional, 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)。