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FreeEnvironmentStringsW

関数

取得した環境ブロックのメモリを解放する(Unicode版)。

DLLKERNEL32.dll文字セットUnicode (-W)呼出規約winapiSetLastErrorあり対応OSWindows XP 以降

シグネチャ

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

BOOL FreeEnvironmentStringsW(
    LPWSTR penv
);

パラメーター

名前	型	方向
penv	LPWSTR	in

戻り値の型: BOOL

各言語での呼び出し定義

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

BOOL FreeEnvironmentStringsW(
    LPWSTR penv
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
static extern bool FreeEnvironmentStringsW(
    [MarshalAs(UnmanagedType.LPWStr)] string penv   // LPWSTR
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FreeEnvironmentStringsW(
    <MarshalAs(UnmanagedType.LPWStr)> penv As String   ' LPWSTR
) As Boolean
End Function

' penv : LPWSTR
Declare PtrSafe Function FreeEnvironmentStringsW Lib "kernel32" ( _
    ByVal penv As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

FreeEnvironmentStringsW = ctypes.windll.kernel32.FreeEnvironmentStringsW
FreeEnvironmentStringsW.restype = wintypes.BOOL
FreeEnvironmentStringsW.argtypes = [
    wintypes.LPCWSTR,  # penv : LPWSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
FreeEnvironmentStringsW = Fiddle::Function.new(
  lib['FreeEnvironmentStringsW'],
  [
    Fiddle::TYPE_VOIDP,  # penv : LPWSTR
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn FreeEnvironmentStringsW(
        penv: *mut u16  // LPWSTR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool FreeEnvironmentStringsW([MarshalAs(UnmanagedType.LPWStr)] string penv);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_FreeEnvironmentStringsW' -Namespace Win32 -PassThru
# $api::FreeEnvironmentStringsW(penv)

#uselib "KERNEL32.dll"
#func global FreeEnvironmentStringsW "FreeEnvironmentStringsW" wptr
; FreeEnvironmentStringsW penv   ; 戻り値は stat
; penv : LPWSTR -> "wptr"
; ※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 FreeEnvironmentStringsW "FreeEnvironmentStringsW" wstr
; res = FreeEnvironmentStringsW(penv)
; penv : LPWSTR -> "wstr"

; BOOL FreeEnvironmentStringsW(LPWSTR penv)
#uselib "KERNEL32.dll"
#cfunc global FreeEnvironmentStringsW "FreeEnvironmentStringsW" wstr
; res = FreeEnvironmentStringsW(penv)
; penv : LPWSTR -> "wstr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procFreeEnvironmentStringsW = kernel32.NewProc("FreeEnvironmentStringsW")
)

// penv (LPWSTR)
r1, _, err := procFreeEnvironmentStringsW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(penv))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function FreeEnvironmentStringsW(
  penv: PWideChar   // LPWSTR
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'FreeEnvironmentStringsW';

result := DllCall("KERNEL32\FreeEnvironmentStringsW"
    , "WStr", penv   ; LPWSTR
    , "Int")   ; return: BOOL

●FreeEnvironmentStringsW(penv) = DLL("KERNEL32.dll", "bool FreeEnvironmentStringsW(char*)")
# 呼び出し: FreeEnvironmentStringsW(penv)
# penv : LPWSTR -> "char*"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。