ホーム › System.Memory › GetSystemFileCacheSize

GetSystemFileCacheSize

関数

システムファイルキャッシュの最小・最大サイズを取得する。

DLLKERNEL32.dll呼出規約winapiSetLastErrorあり対応OSWindows Vista 以降

シグネチャ

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

BOOL GetSystemFileCacheSize(
    UINT_PTR* lpMinimumFileCacheSize,
    UINT_PTR* lpMaximumFileCacheSize,
    DWORD* lpFlags
);

パラメーター

名前	型	方向
lpMinimumFileCacheSize	UINT_PTR*	out
lpMaximumFileCacheSize	UINT_PTR*	out
lpFlags	DWORD*	out

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL GetSystemFileCacheSize(
    UINT_PTR* lpMinimumFileCacheSize,
    UINT_PTR* lpMaximumFileCacheSize,
    DWORD* lpFlags
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true, ExactSpelling = true)]
static extern bool GetSystemFileCacheSize(
    out UIntPtr lpMinimumFileCacheSize,   // UINT_PTR* out
    out UIntPtr lpMaximumFileCacheSize,   // UINT_PTR* out
    out uint lpFlags   // DWORD* out
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetSystemFileCacheSize(
    <Out> ByRef lpMinimumFileCacheSize As UIntPtr,   ' UINT_PTR* out
    <Out> ByRef lpMaximumFileCacheSize As UIntPtr,   ' UINT_PTR* out
    <Out> ByRef lpFlags As UInteger   ' DWORD* out
) As Boolean
End Function

' lpMinimumFileCacheSize : UINT_PTR* out
' lpMaximumFileCacheSize : UINT_PTR* out
' lpFlags : DWORD* out
Declare PtrSafe Function GetSystemFileCacheSize Lib "kernel32" ( _
    ByRef lpMinimumFileCacheSize As LongPtr, _
    ByRef lpMaximumFileCacheSize As LongPtr, _
    ByRef lpFlags 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

GetSystemFileCacheSize = ctypes.windll.kernel32.GetSystemFileCacheSize
GetSystemFileCacheSize.restype = wintypes.BOOL
GetSystemFileCacheSize.argtypes = [
    ctypes.POINTER(ctypes.c_size_t),  # lpMinimumFileCacheSize : UINT_PTR* out
    ctypes.POINTER(ctypes.c_size_t),  # lpMaximumFileCacheSize : UINT_PTR* out
    ctypes.POINTER(wintypes.DWORD),  # lpFlags : DWORD* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetSystemFileCacheSize = Fiddle::Function.new(
  lib['GetSystemFileCacheSize'],
  [
    Fiddle::TYPE_VOIDP,  # lpMinimumFileCacheSize : UINT_PTR* out
    Fiddle::TYPE_VOIDP,  # lpMaximumFileCacheSize : UINT_PTR* out
    Fiddle::TYPE_VOIDP,  # lpFlags : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetSystemFileCacheSize(
        lpMinimumFileCacheSize: *mut usize,  // UINT_PTR* out
        lpMaximumFileCacheSize: *mut usize,  // UINT_PTR* out
        lpFlags: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool GetSystemFileCacheSize(out UIntPtr lpMinimumFileCacheSize, out UIntPtr lpMaximumFileCacheSize, out uint lpFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetSystemFileCacheSize' -Namespace Win32 -PassThru
# $api::GetSystemFileCacheSize(lpMinimumFileCacheSize, lpMaximumFileCacheSize, lpFlags)

#uselib "KERNEL32.dll"
#func global GetSystemFileCacheSize "GetSystemFileCacheSize" sptr, sptr, sptr
; GetSystemFileCacheSize varptr(lpMinimumFileCacheSize), varptr(lpMaximumFileCacheSize), varptr(lpFlags)   ; 戻り値は stat
; lpMinimumFileCacheSize : UINT_PTR* out -> "sptr"
; lpMaximumFileCacheSize : UINT_PTR* out -> "sptr"
; lpFlags : DWORD* 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。

出力引数:

#uselib "KERNEL32.dll"
#cfunc global GetSystemFileCacheSize "GetSystemFileCacheSize" var, var, var
; res = GetSystemFileCacheSize(lpMinimumFileCacheSize, lpMaximumFileCacheSize, lpFlags)
; lpMinimumFileCacheSize : UINT_PTR* out -> "var"
; lpMaximumFileCacheSize : UINT_PTR* out -> "var"
; lpFlags : DWORD* 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。#uselib "KERNEL32.dll"
#cfunc global GetSystemFileCacheSize "GetSystemFileCacheSize" sptr, sptr, sptr
; res = GetSystemFileCacheSize(varptr(lpMinimumFileCacheSize), varptr(lpMaximumFileCacheSize), varptr(lpFlags))
; lpMinimumFileCacheSize : UINT_PTR* out -> "sptr"
; lpMaximumFileCacheSize : UINT_PTR* out -> "sptr"
; lpFlags : DWORD* out -> "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:

; BOOL GetSystemFileCacheSize(UINT_PTR* lpMinimumFileCacheSize, UINT_PTR* lpMaximumFileCacheSize, DWORD* lpFlags)
#uselib "KERNEL32.dll"
#cfunc global GetSystemFileCacheSize "GetSystemFileCacheSize" var, var, var
; res = GetSystemFileCacheSize(lpMinimumFileCacheSize, lpMaximumFileCacheSize, lpFlags)
; lpMinimumFileCacheSize : UINT_PTR* out -> "var"
; lpMaximumFileCacheSize : UINT_PTR* out -> "var"
; lpFlags : DWORD* 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。; BOOL GetSystemFileCacheSize(UINT_PTR* lpMinimumFileCacheSize, UINT_PTR* lpMaximumFileCacheSize, DWORD* lpFlags)
#uselib "KERNEL32.dll"
#cfunc global GetSystemFileCacheSize "GetSystemFileCacheSize" intptr, intptr, intptr
; res = GetSystemFileCacheSize(varptr(lpMinimumFileCacheSize), varptr(lpMaximumFileCacheSize), varptr(lpFlags))
; lpMinimumFileCacheSize : UINT_PTR* out -> "intptr"
; lpMaximumFileCacheSize : UINT_PTR* out -> "intptr"
; lpFlags : DWORD* out -> "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")
	procGetSystemFileCacheSize = kernel32.NewProc("GetSystemFileCacheSize")
)

// lpMinimumFileCacheSize (UINT_PTR* out), lpMaximumFileCacheSize (UINT_PTR* out), lpFlags (DWORD* out)
r1, _, err := procGetSystemFileCacheSize.Call(
	uintptr(lpMinimumFileCacheSize),
	uintptr(lpMaximumFileCacheSize),
	uintptr(lpFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetSystemFileCacheSize(
  lpMinimumFileCacheSize: Pointer;   // UINT_PTR* out
  lpMaximumFileCacheSize: Pointer;   // UINT_PTR* out
  lpFlags: Pointer   // DWORD* out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetSystemFileCacheSize';

result := DllCall("KERNEL32\GetSystemFileCacheSize"
    , "Ptr", lpMinimumFileCacheSize   ; UINT_PTR* out
    , "Ptr", lpMaximumFileCacheSize   ; UINT_PTR* out
    , "Ptr", lpFlags   ; DWORD* out
    , "Int")   ; return: BOOL

●GetSystemFileCacheSize(lpMinimumFileCacheSize, lpMaximumFileCacheSize, lpFlags) = DLL("KERNEL32.dll", "bool GetSystemFileCacheSize(void*, void*, void*)")
# 呼び出し: GetSystemFileCacheSize(lpMinimumFileCacheSize, lpMaximumFileCacheSize, lpFlags)
# lpMinimumFileCacheSize : UINT_PTR* out -> "void*"
# lpMaximumFileCacheSize : UINT_PTR* out -> "void*"
# lpFlags : DWORD* 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)。