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DevFreeObjects

関数

取得したデバイスオブジェクト配列のメモリを解放する。

DLLapi-ms-win-devices-query-l1-1-0.dll呼出規約winapi

シグネチャ

// api-ms-win-devices-query-l1-1-0.dll
#include <windows.h>

void DevFreeObjects(
    DWORD cObjectCount,
    const DEV_OBJECT* pObjects
);

パラメーター

名前	型	方向
cObjectCount	DWORD	in
pObjects	DEV_OBJECT*	in

戻り値の型: void

各言語での呼び出し定義

// api-ms-win-devices-query-l1-1-0.dll
#include <windows.h>

void DevFreeObjects(
    DWORD cObjectCount,
    const DEV_OBJECT* pObjects
);

[DllImport("api-ms-win-devices-query-l1-1-0.dll", ExactSpelling = true)]
static extern void DevFreeObjects(
    uint cObjectCount,   // DWORD
    IntPtr pObjects   // DEV_OBJECT*
);

<DllImport("api-ms-win-devices-query-l1-1-0.dll", ExactSpelling:=True)>
Public Shared Sub DevFreeObjects(
    cObjectCount As UInteger,   ' DWORD
    pObjects As IntPtr   ' DEV_OBJECT*
)
End Sub

' cObjectCount : DWORD
' pObjects : DEV_OBJECT*
Declare PtrSafe Sub DevFreeObjects Lib "api-ms-win-devices-query-l1-1-0" ( _
    ByVal cObjectCount As Long, _
    ByVal pObjects As LongPtr)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DevFreeObjects = ctypes.windll.LoadLibrary("api-ms-win-devices-query-l1-1-0.dll").DevFreeObjects
DevFreeObjects.restype = None
DevFreeObjects.argtypes = [
    wintypes.DWORD,  # cObjectCount : DWORD
    ctypes.c_void_p,  # pObjects : DEV_OBJECT*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-devices-query-l1-1-0.dll')
DevFreeObjects = Fiddle::Function.new(
  lib['DevFreeObjects'],
  [
    -Fiddle::TYPE_INT,  # cObjectCount : DWORD
    Fiddle::TYPE_VOIDP,  # pObjects : DEV_OBJECT*
  ],
  Fiddle::TYPE_VOID)

#[link(name = "api-ms-win-devices-query-l1-1-0")]
extern "system" {
    fn DevFreeObjects(
        cObjectCount: u32,  // DWORD
        pObjects: *const DEV_OBJECT  // DEV_OBJECT*
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("api-ms-win-devices-query-l1-1-0.dll")]
public static extern void DevFreeObjects(uint cObjectCount, IntPtr pObjects);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-devices-query-l1-1-0_DevFreeObjects' -Namespace Win32 -PassThru
# $api::DevFreeObjects(cObjectCount, pObjects)

#uselib "api-ms-win-devices-query-l1-1-0.dll"
#func global DevFreeObjects "DevFreeObjects" sptr, sptr
; DevFreeObjects cObjectCount, varptr(pObjects)
; cObjectCount : DWORD -> "sptr"
; pObjects : DEV_OBJECT* -> "sptr"

出力引数:

#uselib "api-ms-win-devices-query-l1-1-0.dll"
#func global DevFreeObjects "DevFreeObjects" int, var
; DevFreeObjects cObjectCount, pObjects
; cObjectCount : DWORD -> "int"
; pObjects : DEV_OBJECT* -> "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 "api-ms-win-devices-query-l1-1-0.dll"
#func global DevFreeObjects "DevFreeObjects" int, sptr
; DevFreeObjects cObjectCount, varptr(pObjects)
; cObjectCount : DWORD -> "int"
; pObjects : DEV_OBJECT* -> "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:

; void DevFreeObjects(DWORD cObjectCount, DEV_OBJECT* pObjects)
#uselib "api-ms-win-devices-query-l1-1-0.dll"
#func global DevFreeObjects "DevFreeObjects" int, var
; DevFreeObjects cObjectCount, pObjects
; cObjectCount : DWORD -> "int"
; pObjects : DEV_OBJECT* -> "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。; void DevFreeObjects(DWORD cObjectCount, DEV_OBJECT* pObjects)
#uselib "api-ms-win-devices-query-l1-1-0.dll"
#func global DevFreeObjects "DevFreeObjects" int, intptr
; DevFreeObjects cObjectCount, varptr(pObjects)
; cObjectCount : DWORD -> "int"
; pObjects : DEV_OBJECT* -> "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 (
	api_ms_win_devices_query_l1_1_0 = windows.NewLazySystemDLL("api-ms-win-devices-query-l1-1-0.dll")
	procDevFreeObjects = api_ms_win_devices_query_l1_1_0.NewProc("DevFreeObjects")
)

// cObjectCount (DWORD), pObjects (DEV_OBJECT*)
r1, _, err := procDevFreeObjects.Call(
	uintptr(cObjectCount),
	uintptr(pObjects),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure DevFreeObjects(
  cObjectCount: DWORD;   // DWORD
  pObjects: Pointer   // DEV_OBJECT*
); stdcall;
  external 'api-ms-win-devices-query-l1-1-0.dll' name 'DevFreeObjects';

result := DllCall("api-ms-win-devices-query-l1-1-0\DevFreeObjects"
    , "UInt", cObjectCount   ; DWORD
    , "Ptr", pObjects   ; DEV_OBJECT*
    , "Int")   ; return: void

●DevFreeObjects(cObjectCount, pObjects) = DLL("api-ms-win-devices-query-l1-1-0.dll", "int DevFreeObjects(dword, void*)")
# 呼び出し: DevFreeObjects(cObjectCount, pObjects)
# cObjectCount : DWORD -> "dword"
# pObjects : DEV_OBJECT* -> "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)。