FtpFindFirstFileA

// WININET.dll  (ANSI / -A)
#include <windows.h>

void* FtpFindFirstFileA(
    void* hConnect,
    LPCSTR lpszSearchFile,   // optional
    WIN32_FIND_DATAA* lpFindFileData,   // optional
    DWORD dwFlags,
    UINT_PTR dwContext   // optional
);

<DllImport("WININET.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FtpFindFirstFileA(
    hConnect As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPStr)> lpszSearchFile As String,   ' LPCSTR optional
    lpFindFileData As IntPtr,   ' WIN32_FIND_DATAA* optional, out
    dwFlags As UInteger,   ' DWORD
    dwContext As UIntPtr   ' UINT_PTR optional
) As IntPtr
End Function

' hConnect : void*
' lpszSearchFile : LPCSTR optional
' lpFindFileData : WIN32_FIND_DATAA* optional, out
' dwFlags : DWORD
' dwContext : UINT_PTR optional
Declare PtrSafe Function FtpFindFirstFileA Lib "wininet" ( _
    ByVal hConnect As LongPtr, _
    ByVal lpszSearchFile As String, _
    ByVal lpFindFileData As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal dwContext As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

FtpFindFirstFileA = ctypes.windll.wininet.FtpFindFirstFileA
FtpFindFirstFileA.restype = ctypes.c_void_p
FtpFindFirstFileA.argtypes = [
    ctypes.POINTER(None),  # hConnect : void*
    wintypes.LPCSTR,  # lpszSearchFile : LPCSTR optional
    ctypes.c_void_p,  # lpFindFileData : WIN32_FIND_DATAA* optional, out
    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')
FtpFindFirstFileA = Fiddle::Function.new(
  lib['FtpFindFirstFileA'],
  [
    Fiddle::TYPE_VOIDP,  # hConnect : void*
    Fiddle::TYPE_VOIDP,  # lpszSearchFile : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # lpFindFileData : WIN32_FIND_DATAA* optional, out
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_UINTPTR_T,  # dwContext : UINT_PTR optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "wininet")]
extern "system" {
    fn FtpFindFirstFileA(
        hConnect: *mut (),  // void*
        lpszSearchFile: *const u8,  // LPCSTR optional
        lpFindFileData: *mut WIN32_FIND_DATAA,  // WIN32_FIND_DATAA* optional, out
        dwFlags: u32,  // DWORD
        dwContext: usize  // UINT_PTR optional
    ) -> *mut ();
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WININET.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern IntPtr FtpFindFirstFileA(IntPtr hConnect, [MarshalAs(UnmanagedType.LPStr)] string lpszSearchFile, IntPtr lpFindFileData, uint dwFlags, UIntPtr dwContext);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_FtpFindFirstFileA' -Namespace Win32 -PassThru
# $api::FtpFindFirstFileA(hConnect, lpszSearchFile, lpFindFileData, dwFlags, dwContext)

#uselib "WININET.dll"
#func global FtpFindFirstFileA "FtpFindFirstFileA" sptr, sptr, sptr, sptr, sptr
; FtpFindFirstFileA hConnect, lpszSearchFile, varptr(lpFindFileData), dwFlags, dwContext   ; 戻り値は stat
; hConnect : void* -> "sptr"
; lpszSearchFile : LPCSTR optional -> "sptr"
; lpFindFileData : WIN32_FIND_DATAA* optional, out -> "sptr"
; dwFlags : DWORD -> "sptr"
; dwContext : UINT_PTR optional -> "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 FtpFindFirstFileA "FtpFindFirstFileA" sptr, str, var, int, sptr
; res = FtpFindFirstFileA(hConnect, lpszSearchFile, lpFindFileData, dwFlags, dwContext)
; hConnect : void* -> "sptr"
; lpszSearchFile : LPCSTR optional -> "str"
; lpFindFileData : WIN32_FIND_DATAA* optional, out -> "var"
; dwFlags : DWORD -> "int"
; dwContext : UINT_PTR optional -> "sptr"
; ※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。

; void* FtpFindFirstFileA(void* hConnect, LPCSTR lpszSearchFile, WIN32_FIND_DATAA* lpFindFileData, DWORD dwFlags, UINT_PTR dwContext)
#uselib "WININET.dll"
#cfunc global FtpFindFirstFileA "FtpFindFirstFileA" intptr, str, var, int, intptr
; res = FtpFindFirstFileA(hConnect, lpszSearchFile, lpFindFileData, dwFlags, dwContext)
; hConnect : void* -> "intptr"
; lpszSearchFile : LPCSTR optional -> "str"
; lpFindFileData : WIN32_FIND_DATAA* optional, out -> "var"
; dwFlags : DWORD -> "int"
; dwContext : UINT_PTR optional -> "intptr"
; ※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")
	procFtpFindFirstFileA = wininet.NewProc("FtpFindFirstFileA")
)

// hConnect (void*), lpszSearchFile (LPCSTR optional), lpFindFileData (WIN32_FIND_DATAA* optional, out), dwFlags (DWORD), dwContext (UINT_PTR optional)
r1, _, err := procFtpFindFirstFileA.Call(
	uintptr(hConnect),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpszSearchFile))),
	uintptr(lpFindFileData),
	uintptr(dwFlags),
	uintptr(dwContext),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void*

function FtpFindFirstFileA(
  hConnect: Pointer;   // void*
  lpszSearchFile: PAnsiChar;   // LPCSTR optional
  lpFindFileData: Pointer;   // WIN32_FIND_DATAA* optional, out
  dwFlags: DWORD;   // DWORD
  dwContext: NativeUInt   // UINT_PTR optional
): Pointer; stdcall;
  external 'WININET.dll' name 'FtpFindFirstFileA';

result := DllCall("WININET\FtpFindFirstFileA"
    , "Ptr", hConnect   ; void*
    , "AStr", lpszSearchFile   ; LPCSTR optional
    , "Ptr", lpFindFileData   ; WIN32_FIND_DATAA* optional, out
    , "UInt", dwFlags   ; DWORD
    , "UPtr", dwContext   ; UINT_PTR optional
    , "Ptr")   ; return: void*

●FtpFindFirstFileA(hConnect, lpszSearchFile, lpFindFileData, dwFlags, dwContext) = DLL("WININET.dll", "void* FtpFindFirstFileA(void*, char*, void*, dword, int)")
# 呼び出し: FtpFindFirstFileA(hConnect, lpszSearchFile, lpFindFileData, dwFlags, dwContext)
# hConnect : void* -> "void*"
# lpszSearchFile : LPCSTR optional -> "char*"
# lpFindFileData : WIN32_FIND_DATAA* optional, out -> "void*"
# 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)。