FtpDeleteFileW

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

BOOL FtpDeleteFileW(
    void* hConnect,
    LPCWSTR lpszFileName
);

<DllImport("WININET.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FtpDeleteFileW(
    hConnect As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPWStr)> lpszFileName As String   ' LPCWSTR
) As Boolean
End Function

' hConnect : void*
' lpszFileName : LPCWSTR
Declare PtrSafe Function FtpDeleteFileW Lib "wininet" ( _
    ByVal hConnect As LongPtr, _
    ByVal lpszFileName 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

FtpDeleteFileW = ctypes.windll.wininet.FtpDeleteFileW
FtpDeleteFileW.restype = wintypes.BOOL
FtpDeleteFileW.argtypes = [
    ctypes.POINTER(None),  # hConnect : void*
    wintypes.LPCWSTR,  # lpszFileName : LPCWSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
FtpDeleteFileW = Fiddle::Function.new(
  lib['FtpDeleteFileW'],
  [
    Fiddle::TYPE_VOIDP,  # hConnect : void*
    Fiddle::TYPE_VOIDP,  # lpszFileName : LPCWSTR
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "wininet")]
extern "system" {
    fn FtpDeleteFileW(
        hConnect: *mut (),  // void*
        lpszFileName: *const u16  // LPCWSTR
    ) -> 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 FtpDeleteFileW(IntPtr hConnect, [MarshalAs(UnmanagedType.LPWStr)] string lpszFileName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_FtpDeleteFileW' -Namespace Win32 -PassThru
# $api::FtpDeleteFileW(hConnect, lpszFileName)

#uselib "WININET.dll"
#func global FtpDeleteFileW "FtpDeleteFileW" wptr, wptr
; FtpDeleteFileW hConnect, lpszFileName   ; 戻り値は stat
; hConnect : void* -> "wptr"
; lpszFileName : LPCWSTR -> "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 FtpDeleteFileW "FtpDeleteFileW" sptr, wstr
; res = FtpDeleteFileW(hConnect, lpszFileName)
; hConnect : void* -> "sptr"
; lpszFileName : LPCWSTR -> "wstr"

; BOOL FtpDeleteFileW(void* hConnect, LPCWSTR lpszFileName)
#uselib "WININET.dll"
#cfunc global FtpDeleteFileW "FtpDeleteFileW" intptr, wstr
; res = FtpDeleteFileW(hConnect, lpszFileName)
; hConnect : void* -> "intptr"
; lpszFileName : LPCWSTR -> "wstr"

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procFtpDeleteFileW = wininet.NewProc("FtpDeleteFileW")
)

// hConnect (void*), lpszFileName (LPCWSTR)
r1, _, err := procFtpDeleteFileW.Call(
	uintptr(hConnect),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszFileName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function FtpDeleteFileW(
  hConnect: Pointer;   // void*
  lpszFileName: PWideChar   // LPCWSTR
): BOOL; stdcall;
  external 'WININET.dll' name 'FtpDeleteFileW';

result := DllCall("WININET\FtpDeleteFileW"
    , "Ptr", hConnect   ; void*
    , "WStr", lpszFileName   ; LPCWSTR
    , "Int")   ; return: BOOL

●FtpDeleteFileW(hConnect, lpszFileName) = DLL("WININET.dll", "bool FtpDeleteFileW(void*, char*)")
# 呼び出し: FtpDeleteFileW(hConnect, lpszFileName)
# hConnect : void* -> "void*"
# lpszFileName : LPCWSTR -> "char*"
# 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。