CancelIo

関数

現在のスレッドが発行した保留中のI/Oをキャンセルする。

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

シグネチャ

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

BOOL CancelIo(
    HANDLE hFile
);

パラメーター

名前	型	方向
hFile	HANDLE	in

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL CancelIo(
    HANDLE hFile
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true, ExactSpelling = true)]
static extern bool CancelIo(
    IntPtr hFile   // HANDLE
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CancelIo(
    hFile As IntPtr   ' HANDLE
) As Boolean
End Function

' hFile : HANDLE
Declare PtrSafe Function CancelIo Lib "kernel32" ( _
    ByVal hFile 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

CancelIo = ctypes.windll.kernel32.CancelIo
CancelIo.restype = wintypes.BOOL
CancelIo.argtypes = [
    wintypes.HANDLE,  # hFile : HANDLE
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
CancelIo = Fiddle::Function.new(
  lib['CancelIo'],
  [
    Fiddle::TYPE_VOIDP,  # hFile : HANDLE
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn CancelIo(
        hFile: *mut core::ffi::c_void  // HANDLE
    ) -> 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 CancelIo(IntPtr hFile);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_CancelIo' -Namespace Win32 -PassThru
# $api::CancelIo(hFile)

#uselib "KERNEL32.dll"
#func global CancelIo "CancelIo" sptr
; CancelIo hFile   ; 戻り値は stat
; hFile : HANDLE -> "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。

#uselib "KERNEL32.dll"
#cfunc global CancelIo "CancelIo" sptr
; res = CancelIo(hFile)
; hFile : HANDLE -> "sptr"

; BOOL CancelIo(HANDLE hFile)
#uselib "KERNEL32.dll"
#cfunc global CancelIo "CancelIo" intptr
; res = CancelIo(hFile)
; hFile : HANDLE -> "intptr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procCancelIo = kernel32.NewProc("CancelIo")
)

// hFile (HANDLE)
r1, _, err := procCancelIo.Call(
	uintptr(hFile),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CancelIo(
  hFile: THandle   // HANDLE
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'CancelIo';

result := DllCall("KERNEL32\CancelIo"
    , "Ptr", hFile   ; HANDLE
    , "Int")   ; return: BOOL

●CancelIo(hFile) = DLL("KERNEL32.dll", "bool CancelIo(void*)")
# 呼び出し: CancelIo(hFile)
# hFile : HANDLE -> "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)。