JetFreeBuffer

関数

ESE APIが割り当てたバッファを解放する。

DLLESENT.dll呼出規約winapi

シグネチャ

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

INT JetFreeBuffer(
    CHAR* pbBuf
);

パラメーター

名前	型	方向
pbBuf	CHAR*	inout

戻り値の型: INT

各言語での呼び出し定義

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

INT JetFreeBuffer(
    CHAR* pbBuf
);

[DllImport("ESENT.dll", ExactSpelling = true)]
static extern int JetFreeBuffer(
    IntPtr pbBuf   // CHAR* in/out
);

<DllImport("ESENT.dll", ExactSpelling:=True)>
Public Shared Function JetFreeBuffer(
    pbBuf As IntPtr   ' CHAR* in/out
) As Integer
End Function

' pbBuf : CHAR* in/out
Declare PtrSafe Function JetFreeBuffer Lib "esent" ( _
    ByVal pbBuf 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

JetFreeBuffer = ctypes.windll.esent.JetFreeBuffer
JetFreeBuffer.restype = ctypes.c_int
JetFreeBuffer.argtypes = [
    ctypes.POINTER(ctypes.c_byte),  # pbBuf : CHAR* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ESENT.dll')
JetFreeBuffer = Fiddle::Function.new(
  lib['JetFreeBuffer'],
  [
    Fiddle::TYPE_VOIDP,  # pbBuf : CHAR* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "esent")]
extern "system" {
    fn JetFreeBuffer(
        pbBuf: *mut i8  // CHAR* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ESENT.dll")]
public static extern int JetFreeBuffer(IntPtr pbBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ESENT_JetFreeBuffer' -Namespace Win32 -PassThru
# $api::JetFreeBuffer(pbBuf)

#uselib "ESENT.dll"
#func global JetFreeBuffer "JetFreeBuffer" sptr
; JetFreeBuffer varptr(pbBuf)   ; 戻り値は stat
; pbBuf : CHAR* 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 "ESENT.dll"
#cfunc global JetFreeBuffer "JetFreeBuffer" var
; res = JetFreeBuffer(pbBuf)
; pbBuf : CHAR* 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 "ESENT.dll"
#cfunc global JetFreeBuffer "JetFreeBuffer" sptr
; res = JetFreeBuffer(varptr(pbBuf))
; pbBuf : CHAR* 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:

; INT JetFreeBuffer(CHAR* pbBuf)
#uselib "ESENT.dll"
#cfunc global JetFreeBuffer "JetFreeBuffer" var
; res = JetFreeBuffer(pbBuf)
; pbBuf : CHAR* 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。; INT JetFreeBuffer(CHAR* pbBuf)
#uselib "ESENT.dll"
#cfunc global JetFreeBuffer "JetFreeBuffer" intptr
; res = JetFreeBuffer(varptr(pbBuf))
; pbBuf : CHAR* 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 (
	esent = windows.NewLazySystemDLL("ESENT.dll")
	procJetFreeBuffer = esent.NewProc("JetFreeBuffer")
)

// pbBuf (CHAR* in/out)
r1, _, err := procJetFreeBuffer.Call(
	uintptr(pbBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function JetFreeBuffer(
  pbBuf: Pointer   // CHAR* in/out
): Integer; stdcall;
  external 'ESENT.dll' name 'JetFreeBuffer';

result := DllCall("ESENT\JetFreeBuffer"
    , "Ptr", pbBuf   ; CHAR* in/out
    , "Int")   ; return: INT

●JetFreeBuffer(pbBuf) = DLL("ESENT.dll", "int JetFreeBuffer(void*)")
# 呼び出し: JetFreeBuffer(pbBuf)
# pbBuf : CHAR* 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)。