ホーム › Storage.FileSystem › CompareFileTime

CompareFileTime

関数

二つのファイル時刻を比較し前後関係を返す。

DLLKERNEL32.dll呼出規約winapi対応OSWindows XP 以降

シグネチャ

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

INT CompareFileTime(
    const FILETIME* lpFileTime1,
    const FILETIME* lpFileTime2
);

パラメーター

名前	型	方向
lpFileTime1	FILETIME*	in
lpFileTime2	FILETIME*	in

戻り値の型: INT

各言語での呼び出し定義

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

INT CompareFileTime(
    const FILETIME* lpFileTime1,
    const FILETIME* lpFileTime2
);

[DllImport("KERNEL32.dll", ExactSpelling = true)]
static extern int CompareFileTime(
    IntPtr lpFileTime1,   // FILETIME*
    IntPtr lpFileTime2   // FILETIME*
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function CompareFileTime(
    lpFileTime1 As IntPtr,   ' FILETIME*
    lpFileTime2 As IntPtr   ' FILETIME*
) As Integer
End Function

' lpFileTime1 : FILETIME*
' lpFileTime2 : FILETIME*
Declare PtrSafe Function CompareFileTime Lib "kernel32" ( _
    ByVal lpFileTime1 As LongPtr, _
    ByVal lpFileTime2 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

CompareFileTime = ctypes.windll.kernel32.CompareFileTime
CompareFileTime.restype = ctypes.c_int
CompareFileTime.argtypes = [
    ctypes.c_void_p,  # lpFileTime1 : FILETIME*
    ctypes.c_void_p,  # lpFileTime2 : FILETIME*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
CompareFileTime = Fiddle::Function.new(
  lib['CompareFileTime'],
  [
    Fiddle::TYPE_VOIDP,  # lpFileTime1 : FILETIME*
    Fiddle::TYPE_VOIDP,  # lpFileTime2 : FILETIME*
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn CompareFileTime(
        lpFileTime1: *const FILETIME,  // FILETIME*
        lpFileTime2: *const FILETIME  // FILETIME*
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern int CompareFileTime(IntPtr lpFileTime1, IntPtr lpFileTime2);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_CompareFileTime' -Namespace Win32 -PassThru
# $api::CompareFileTime(lpFileTime1, lpFileTime2)

#uselib "KERNEL32.dll"
#func global CompareFileTime "CompareFileTime" sptr, sptr
; CompareFileTime varptr(lpFileTime1), varptr(lpFileTime2)   ; 戻り値は stat
; lpFileTime1 : FILETIME* -> "sptr"
; lpFileTime2 : FILETIME* -> "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。

出力引数:

#uselib "KERNEL32.dll"
#cfunc global CompareFileTime "CompareFileTime" var, var
; res = CompareFileTime(lpFileTime1, lpFileTime2)
; lpFileTime1 : FILETIME* -> "var"
; lpFileTime2 : FILETIME* -> "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。#uselib "KERNEL32.dll"
#cfunc global CompareFileTime "CompareFileTime" sptr, sptr
; res = CompareFileTime(varptr(lpFileTime1), varptr(lpFileTime2))
; lpFileTime1 : FILETIME* -> "sptr"
; lpFileTime2 : FILETIME* -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; INT CompareFileTime(FILETIME* lpFileTime1, FILETIME* lpFileTime2)
#uselib "KERNEL32.dll"
#cfunc global CompareFileTime "CompareFileTime" var, var
; res = CompareFileTime(lpFileTime1, lpFileTime2)
; lpFileTime1 : FILETIME* -> "var"
; lpFileTime2 : FILETIME* -> "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。; INT CompareFileTime(FILETIME* lpFileTime1, FILETIME* lpFileTime2)
#uselib "KERNEL32.dll"
#cfunc global CompareFileTime "CompareFileTime" intptr, intptr
; res = CompareFileTime(varptr(lpFileTime1), varptr(lpFileTime2))
; lpFileTime1 : FILETIME* -> "intptr"
; lpFileTime2 : FILETIME* -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procCompareFileTime = kernel32.NewProc("CompareFileTime")
)

// lpFileTime1 (FILETIME*), lpFileTime2 (FILETIME*)
r1, _, err := procCompareFileTime.Call(
	uintptr(lpFileTime1),
	uintptr(lpFileTime2),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function CompareFileTime(
  lpFileTime1: Pointer;   // FILETIME*
  lpFileTime2: Pointer   // FILETIME*
): Integer; stdcall;
  external 'KERNEL32.dll' name 'CompareFileTime';

result := DllCall("KERNEL32\CompareFileTime"
    , "Ptr", lpFileTime1   ; FILETIME*
    , "Ptr", lpFileTime2   ; FILETIME*
    , "Int")   ; return: INT

●CompareFileTime(lpFileTime1, lpFileTime2) = DLL("KERNEL32.dll", "int CompareFileTime(void*, void*)")
# 呼び出し: CompareFileTime(lpFileTime1, lpFileTime2)
# lpFileTime1 : FILETIME* -> "void*"
# lpFileTime2 : FILETIME* -> "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)。