OpenFile

// KERNEL32.dll
#include <windows.h>

INT OpenFile(
    LPCSTR lpFileName,
    OFSTRUCT* lpReOpenBuff,
    DWORD uStyle
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function OpenFile(
    <MarshalAs(UnmanagedType.LPStr)> lpFileName As String,   ' LPCSTR
    lpReOpenBuff As IntPtr,   ' OFSTRUCT* in/out
    uStyle As UInteger   ' DWORD
) As Integer
End Function

' lpFileName : LPCSTR
' lpReOpenBuff : OFSTRUCT* in/out
' uStyle : DWORD
Declare PtrSafe Function OpenFile Lib "kernel32" ( _
    ByVal lpFileName As String, _
    ByVal lpReOpenBuff As LongPtr, _
    ByVal uStyle As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

OpenFile = ctypes.windll.kernel32.OpenFile
OpenFile.restype = ctypes.c_int
OpenFile.argtypes = [
    wintypes.LPCSTR,  # lpFileName : LPCSTR
    ctypes.c_void_p,  # lpReOpenBuff : OFSTRUCT* in/out
    wintypes.DWORD,  # uStyle : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
OpenFile = Fiddle::Function.new(
  lib['OpenFile'],
  [
    Fiddle::TYPE_VOIDP,  # lpFileName : LPCSTR
    Fiddle::TYPE_VOIDP,  # lpReOpenBuff : OFSTRUCT* in/out
    -Fiddle::TYPE_INT,  # uStyle : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn OpenFile(
        lpFileName: *const u8,  // LPCSTR
        lpReOpenBuff: *mut OFSTRUCT,  // OFSTRUCT* in/out
        uStyle: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern int OpenFile([MarshalAs(UnmanagedType.LPStr)] string lpFileName, IntPtr lpReOpenBuff, uint uStyle);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_OpenFile' -Namespace Win32 -PassThru
# $api::OpenFile(lpFileName, lpReOpenBuff, uStyle)

#uselib "KERNEL32.dll"
#func global OpenFile "OpenFile" sptr, sptr, sptr
; OpenFile lpFileName, varptr(lpReOpenBuff), uStyle   ; 戻り値は stat
; lpFileName : LPCSTR -> "sptr"
; lpReOpenBuff : OFSTRUCT* in/out -> "sptr"
; uStyle : DWORD -> "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 "KERNEL32.dll"
#cfunc global OpenFile "OpenFile" str, var, int
; res = OpenFile(lpFileName, lpReOpenBuff, uStyle)
; lpFileName : LPCSTR -> "str"
; lpReOpenBuff : OFSTRUCT* in/out -> "var"
; uStyle : DWORD -> "int"
; ※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。

; INT OpenFile(LPCSTR lpFileName, OFSTRUCT* lpReOpenBuff, DWORD uStyle)
#uselib "KERNEL32.dll"
#cfunc global OpenFile "OpenFile" str, var, int
; res = OpenFile(lpFileName, lpReOpenBuff, uStyle)
; lpFileName : LPCSTR -> "str"
; lpReOpenBuff : OFSTRUCT* in/out -> "var"
; uStyle : DWORD -> "int"
; ※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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procOpenFile = kernel32.NewProc("OpenFile")
)

// lpFileName (LPCSTR), lpReOpenBuff (OFSTRUCT* in/out), uStyle (DWORD)
r1, _, err := procOpenFile.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpFileName))),
	uintptr(lpReOpenBuff),
	uintptr(uStyle),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function OpenFile(
  lpFileName: PAnsiChar;   // LPCSTR
  lpReOpenBuff: Pointer;   // OFSTRUCT* in/out
  uStyle: DWORD   // DWORD
): Integer; stdcall;
  external 'KERNEL32.dll' name 'OpenFile';

result := DllCall("KERNEL32\OpenFile"
    , "AStr", lpFileName   ; LPCSTR
    , "Ptr", lpReOpenBuff   ; OFSTRUCT* in/out
    , "UInt", uStyle   ; DWORD
    , "Int")   ; return: INT

●OpenFile(lpFileName, lpReOpenBuff, uStyle) = DLL("KERNEL32.dll", "int OpenFile(char*, void*, dword)")
# 呼び出し: OpenFile(lpFileName, lpReOpenBuff, uStyle)
# lpFileName : LPCSTR -> "char*"
# lpReOpenBuff : OFSTRUCT* in/out -> "void*"
# uStyle : DWORD -> "dword"
# 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)。