TruncateLog

関数

マーシャリング領域のCLFSログを指定LSNで切り詰める。

DLLclfsw32.dll呼出規約winapiSetLastErrorあり対応OSWindows Vista 以降

シグネチャ

// clfsw32.dll
#include <windows.h>

BOOL TruncateLog(
    void* pvMarshal,
    CLS_LSN* plsnEnd,
    OVERLAPPED* lpOverlapped   // optional
);

パラメーター

名前	型	方向
pvMarshal	void*	in
plsnEnd	CLS_LSN*	in
lpOverlapped	OVERLAPPED*	inoutoptional

戻り値の型: BOOL

各言語での呼び出し定義

// clfsw32.dll
#include <windows.h>

BOOL TruncateLog(
    void* pvMarshal,
    CLS_LSN* plsnEnd,
    OVERLAPPED* lpOverlapped   // optional
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("clfsw32.dll", SetLastError = true, ExactSpelling = true)]
static extern bool TruncateLog(
    IntPtr pvMarshal,   // void*
    IntPtr plsnEnd,   // CLS_LSN*
    IntPtr lpOverlapped   // OVERLAPPED* optional, in/out
);

<DllImport("clfsw32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function TruncateLog(
    pvMarshal As IntPtr,   ' void*
    plsnEnd As IntPtr,   ' CLS_LSN*
    lpOverlapped As IntPtr   ' OVERLAPPED* optional, in/out
) As Boolean
End Function

' pvMarshal : void*
' plsnEnd : CLS_LSN*
' lpOverlapped : OVERLAPPED* optional, in/out
Declare PtrSafe Function TruncateLog Lib "clfsw32" ( _
    ByVal pvMarshal As LongPtr, _
    ByVal plsnEnd As LongPtr, _
    ByVal lpOverlapped 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

TruncateLog = ctypes.windll.clfsw32.TruncateLog
TruncateLog.restype = wintypes.BOOL
TruncateLog.argtypes = [
    ctypes.POINTER(None),  # pvMarshal : void*
    ctypes.c_void_p,  # plsnEnd : CLS_LSN*
    ctypes.c_void_p,  # lpOverlapped : OVERLAPPED* optional, in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('clfsw32.dll')
TruncateLog = Fiddle::Function.new(
  lib['TruncateLog'],
  [
    Fiddle::TYPE_VOIDP,  # pvMarshal : void*
    Fiddle::TYPE_VOIDP,  # plsnEnd : CLS_LSN*
    Fiddle::TYPE_VOIDP,  # lpOverlapped : OVERLAPPED* optional, in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "clfsw32")]
extern "system" {
    fn TruncateLog(
        pvMarshal: *mut (),  // void*
        plsnEnd: *mut CLS_LSN,  // CLS_LSN*
        lpOverlapped: *mut OVERLAPPED  // OVERLAPPED* optional, in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("clfsw32.dll", SetLastError = true)]
public static extern bool TruncateLog(IntPtr pvMarshal, IntPtr plsnEnd, IntPtr lpOverlapped);
"@
$api = Add-Type -MemberDefinition $sig -Name 'clfsw32_TruncateLog' -Namespace Win32 -PassThru
# $api::TruncateLog(pvMarshal, plsnEnd, lpOverlapped)

#uselib "clfsw32.dll"
#func global TruncateLog "TruncateLog" sptr, sptr, sptr
; TruncateLog pvMarshal, varptr(plsnEnd), varptr(lpOverlapped)   ; 戻り値は stat
; pvMarshal : void* -> "sptr"
; plsnEnd : CLS_LSN* -> "sptr"
; lpOverlapped : OVERLAPPED* optional, in/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 "clfsw32.dll"
#cfunc global TruncateLog "TruncateLog" sptr, var, var
; res = TruncateLog(pvMarshal, plsnEnd, lpOverlapped)
; pvMarshal : void* -> "sptr"
; plsnEnd : CLS_LSN* -> "var"
; lpOverlapped : OVERLAPPED* optional, in/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 "clfsw32.dll"
#cfunc global TruncateLog "TruncateLog" sptr, sptr, sptr
; res = TruncateLog(pvMarshal, varptr(plsnEnd), varptr(lpOverlapped))
; pvMarshal : void* -> "sptr"
; plsnEnd : CLS_LSN* -> "sptr"
; lpOverlapped : OVERLAPPED* optional, in/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 TruncateLog(void* pvMarshal, CLS_LSN* plsnEnd, OVERLAPPED* lpOverlapped)
#uselib "clfsw32.dll"
#cfunc global TruncateLog "TruncateLog" intptr, var, var
; res = TruncateLog(pvMarshal, plsnEnd, lpOverlapped)
; pvMarshal : void* -> "intptr"
; plsnEnd : CLS_LSN* -> "var"
; lpOverlapped : OVERLAPPED* optional, in/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 TruncateLog(void* pvMarshal, CLS_LSN* plsnEnd, OVERLAPPED* lpOverlapped)
#uselib "clfsw32.dll"
#cfunc global TruncateLog "TruncateLog" intptr, intptr, intptr
; res = TruncateLog(pvMarshal, varptr(plsnEnd), varptr(lpOverlapped))
; pvMarshal : void* -> "intptr"
; plsnEnd : CLS_LSN* -> "intptr"
; lpOverlapped : OVERLAPPED* optional, in/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 (
	clfsw32 = windows.NewLazySystemDLL("clfsw32.dll")
	procTruncateLog = clfsw32.NewProc("TruncateLog")
)

// pvMarshal (void*), plsnEnd (CLS_LSN*), lpOverlapped (OVERLAPPED* optional, in/out)
r1, _, err := procTruncateLog.Call(
	uintptr(pvMarshal),
	uintptr(plsnEnd),
	uintptr(lpOverlapped),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function TruncateLog(
  pvMarshal: Pointer;   // void*
  plsnEnd: Pointer;   // CLS_LSN*
  lpOverlapped: Pointer   // OVERLAPPED* optional, in/out
): BOOL; stdcall;
  external 'clfsw32.dll' name 'TruncateLog';

result := DllCall("clfsw32\TruncateLog"
    , "Ptr", pvMarshal   ; void*
    , "Ptr", plsnEnd   ; CLS_LSN*
    , "Ptr", lpOverlapped   ; OVERLAPPED* optional, in/out
    , "Int")   ; return: BOOL

●TruncateLog(pvMarshal, plsnEnd, lpOverlapped) = DLL("clfsw32.dll", "bool TruncateLog(void*, void*, void*)")
# 呼び出し: TruncateLog(pvMarshal, plsnEnd, lpOverlapped)
# pvMarshal : void* -> "void*"
# plsnEnd : CLS_LSN* -> "void*"
# lpOverlapped : OVERLAPPED* optional, in/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)。