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DISK_CACHE_INFORMATION

構造体

サイズx64: 24 バイト / x86: 20 バイト

サイズ=各フィールドのバイト数(x64/x86 で異なる場合は x64/x86 と併記)。x64/x86 列=フィールドのバイトオフセット(HSPで dupptr / lpoke / wpoke 等に使用)。

フィールド

フィールド	型	サイズ	x64	x86	説明
ParametersSavable	BOOLEAN	1	+0	+0	キャッシュ設定をデバイスに保存できるかを示す真偽値。
ReadCacheEnabled	BOOLEAN	1	+1	+1	読み取りキャッシュが有効かどうかを示す真偽値。
WriteCacheEnabled	BOOLEAN	1	+2	+2	書き込みキャッシュが有効かどうかを示す真偽値。
ReadRetentionPriority	DISK_CACHE_RETENTION_PRIORITY	4	+4	+4	読み取りデータのキャッシュ保持優先度を示す列挙値。
WriteRetentionPriority	DISK_CACHE_RETENTION_PRIORITY	4	+8	+8	書き込みデータのキャッシュ保持優先度を示す列挙値。
DisablePrefetchTransferLength	WORD	2	+12	+12	プリフェッチを無効化する転送長のしきい値。
PrefetchScalar	BOOLEAN	1	+14	+14	プリフェッチ量がスカラー指定かどうかを示す真偽値。
Anonymous	_Anonymous_e__Union	8/4	+16	+16	スカラー/ブロック別のプリフェッチパラメータを保持する共用体。

共用体: _Anonymous_e__Union x64 8B / x86 4B

フィールド	型	サイズ	x64	x86
ScalarPrefetch	_ScalarPrefetch_e__Struct	8/4	+0	+0
BlockPrefetch	_BlockPrefetch_e__Struct	8/4	+0	+0

各言語での定義

#include <windows.h>

// DISK_CACHE_INFORMATION  (x64 24 / x86 20 バイト)
typedef struct DISK_CACHE_INFORMATION {
    BOOLEAN ParametersSavable;
    BOOLEAN ReadCacheEnabled;
    BOOLEAN WriteCacheEnabled;
    DISK_CACHE_RETENTION_PRIORITY ReadRetentionPriority;
    DISK_CACHE_RETENTION_PRIORITY WriteRetentionPriority;
    WORD DisablePrefetchTransferLength;
    BOOLEAN PrefetchScalar;
    _Anonymous_e__Union Anonymous;
} DISK_CACHE_INFORMATION;

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DISK_CACHE_INFORMATION
{
    [MarshalAs(UnmanagedType.U1)] public bool ParametersSavable;
    [MarshalAs(UnmanagedType.U1)] public bool ReadCacheEnabled;
    [MarshalAs(UnmanagedType.U1)] public bool WriteCacheEnabled;
    public int ReadRetentionPriority;
    public int WriteRetentionPriority;
    public ushort DisablePrefetchTransferLength;
    [MarshalAs(UnmanagedType.U1)] public bool PrefetchScalar;
    public _Anonymous_e__Union Anonymous;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure DISK_CACHE_INFORMATION
    <MarshalAs(UnmanagedType.U1)> Public ParametersSavable As Boolean
    <MarshalAs(UnmanagedType.U1)> Public ReadCacheEnabled As Boolean
    <MarshalAs(UnmanagedType.U1)> Public WriteCacheEnabled As Boolean
    Public ReadRetentionPriority As Integer
    Public WriteRetentionPriority As Integer
    Public DisablePrefetchTransferLength As UShort
    <MarshalAs(UnmanagedType.U1)> Public PrefetchScalar As Boolean
    Public Anonymous As _Anonymous_e__Union
End Structure

import ctypes
from ctypes import wintypes

class DISK_CACHE_INFORMATION(ctypes.Structure):
    _fields_ = [
        ("ParametersSavable", ctypes.c_byte),
        ("ReadCacheEnabled", ctypes.c_byte),
        ("WriteCacheEnabled", ctypes.c_byte),
        ("ReadRetentionPriority", ctypes.c_int),
        ("WriteRetentionPriority", ctypes.c_int),
        ("DisablePrefetchTransferLength", ctypes.c_ushort),
        ("PrefetchScalar", ctypes.c_byte),
        ("Anonymous", _Anonymous_e__Union),
    ]

#[repr(C)]
pub struct DISK_CACHE_INFORMATION {
    pub ParametersSavable: u8,
    pub ReadCacheEnabled: u8,
    pub WriteCacheEnabled: u8,
    pub ReadRetentionPriority: i32,
    pub WriteRetentionPriority: i32,
    pub DisablePrefetchTransferLength: u16,
    pub PrefetchScalar: u8,
    pub Anonymous: _Anonymous_e__Union,
}

import "golang.org/x/sys/windows"

type DISK_CACHE_INFORMATION struct {
	ParametersSavable byte
	ReadCacheEnabled byte
	WriteCacheEnabled byte
	ReadRetentionPriority int32
	WriteRetentionPriority int32
	DisablePrefetchTransferLength uint16
	PrefetchScalar byte
	Anonymous _Anonymous_e__Union
}

type
  DISK_CACHE_INFORMATION = record
    ParametersSavable: ByteBool;
    ReadCacheEnabled: ByteBool;
    WriteCacheEnabled: ByteBool;
    ReadRetentionPriority: Integer;
    WriteRetentionPriority: Integer;
    DisablePrefetchTransferLength: Word;
    PrefetchScalar: ByteBool;
    Anonymous: _Anonymous_e__Union;
  end;

const DISK_CACHE_INFORMATION = extern struct {
    ParametersSavable: u8,
    ReadCacheEnabled: u8,
    WriteCacheEnabled: u8,
    ReadRetentionPriority: i32,
    WriteRetentionPriority: i32,
    DisablePrefetchTransferLength: u16,
    PrefetchScalar: u8,
    Anonymous: _Anonymous_e__Union,
};

type
  DISK_CACHE_INFORMATION {.bycopy.} = object
    ParametersSavable: uint8
    ReadCacheEnabled: uint8
    WriteCacheEnabled: uint8
    ReadRetentionPriority: int32
    WriteRetentionPriority: int32
    DisablePrefetchTransferLength: uint16
    PrefetchScalar: uint8
    Anonymous: _Anonymous_e__Union

struct DISK_CACHE_INFORMATION
{
    ubyte ParametersSavable;
    ubyte ReadCacheEnabled;
    ubyte WriteCacheEnabled;
    int ReadRetentionPriority;
    int WriteRetentionPriority;
    ushort DisablePrefetchTransferLength;
    ubyte PrefetchScalar;
    _Anonymous_e__Union Anonymous;
}

HSP用定義

HSP3.7/3.8 は構造体機能が無いため4byte整数配列(dim)+peek/poke で操作(32/64bitでサイズ・位置が異なる場合はタブで分割)。IronHSP は NSTRUCT(#defstruct/stdim/->)で32/64bit共通。

; HSP3.7/3.8 は構造体機能が無いため、4byte整数の配列変数で操作します。(x86 レイアウト)
; DISK_CACHE_INFORMATION サイズ: 20 バイト(x86)
dim st, 5    ; 4byte整数×5(構造体サイズ 20 / 4 切り上げ)
; ParametersSavable : BOOLEAN (+0, 1byte)  poke st,0,値  /  値 = peek(st,0)
; ReadCacheEnabled : BOOLEAN (+1, 1byte)  poke st,1,値  /  値 = peek(st,1)
; WriteCacheEnabled : BOOLEAN (+2, 1byte)  poke st,2,値  /  値 = peek(st,2)
; ReadRetentionPriority : DISK_CACHE_RETENTION_PRIORITY (+4, 4byte)  st.1 = 値  /  値 = st.1   (lpoke/lpeek も可)
; WriteRetentionPriority : DISK_CACHE_RETENTION_PRIORITY (+8, 4byte)  st.2 = 値  /  値 = st.2   (lpoke/lpeek も可)
; DisablePrefetchTransferLength : WORD (+12, 2byte)  wpoke st,12,値  /  値 = wpeek(st,12)
; PrefetchScalar : BOOLEAN (+14, 1byte)  poke st,14,値  /  値 = peek(st,14)
; Anonymous : _Anonymous_e__Union (+16, 4byte)  varptr(st)+16 を基点に操作(4byte:入れ子/配列)
; ※4byte境界の整数は添字 st.N(N=オフセット/4)で読み書き可。それ以外は peek/poke 系を使用。

; HSP3.7/3.8 は構造体機能が無いため、4byte整数の配列変数で操作します。(x64 レイアウト)
; DISK_CACHE_INFORMATION サイズ: 24 バイト(x64)
dim st, 6    ; 4byte整数×6(構造体サイズ 24 / 4 切り上げ)
; ParametersSavable : BOOLEAN (+0, 1byte)  poke st,0,値  /  値 = peek(st,0)
; ReadCacheEnabled : BOOLEAN (+1, 1byte)  poke st,1,値  /  値 = peek(st,1)
; WriteCacheEnabled : BOOLEAN (+2, 1byte)  poke st,2,値  /  値 = peek(st,2)
; ReadRetentionPriority : DISK_CACHE_RETENTION_PRIORITY (+4, 4byte)  st.1 = 値  /  値 = st.1   (lpoke/lpeek も可)
; WriteRetentionPriority : DISK_CACHE_RETENTION_PRIORITY (+8, 4byte)  st.2 = 値  /  値 = st.2   (lpoke/lpeek も可)
; DisablePrefetchTransferLength : WORD (+12, 2byte)  wpoke st,12,値  /  値 = wpeek(st,12)
; PrefetchScalar : BOOLEAN (+14, 1byte)  poke st,14,値  /  値 = peek(st,14)
; Anonymous : _Anonymous_e__Union (+16, 8byte)  varptr(st)+16 を基点に操作(8byte:入れ子/配列)
; ※4byte境界の整数は添字 st.N(N=オフセット/4)で読み書き可。それ以外は peek/poke 系を使用。

; IronHSP は NSTRUCT(構造体)をサポート。32bit/64bit どちらでも同じコードで動作します。
#defstruct global DISK_CACHE_INFORMATION
    #field bool1 ParametersSavable
    #field bool1 ReadCacheEnabled
    #field bool1 WriteCacheEnabled
    #field int ReadRetentionPriority
    #field int WriteRetentionPriority
    #field short DisablePrefetchTransferLength
    #field bool1 PrefetchScalar
    #field byte Anonymous 8
#endstruct

stdim st, DISK_CACHE_INFORMATION        ; NSTRUCT 変数を確保
st->ParametersSavable = 100
mes "ParametersSavable=" + st->ParametersSavable
; ※union フィールドは byte 列で確保(NSTRUCT は union 非対応)。必要に応じ手動でアクセス。

DISK_CACHE_INFORMATION

フィールド

共用体: _Anonymous_e__Union x64 8B / x86 4B

各言語での定義

HSP用 定義

HSP用定義