ホーム › System.Environment › FreeEnvironmentStringsA

FreeEnvironmentStringsA

関数

取得した環境ブロックのメモリを解放する(ANSI版)。

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

シグネチャ

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

BOOL FreeEnvironmentStringsA(
    LPSTR penv
);

パラメーター

名前	型	方向
penv	LPSTR	in

戻り値の型: BOOL

各言語での呼び出し定義

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

BOOL FreeEnvironmentStringsA(
    LPSTR penv
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
static extern bool FreeEnvironmentStringsA(
    [MarshalAs(UnmanagedType.LPStr)] string penv   // LPSTR
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FreeEnvironmentStringsA(
    <MarshalAs(UnmanagedType.LPStr)> penv As String   ' LPSTR
) As Boolean
End Function

' penv : LPSTR
Declare PtrSafe Function FreeEnvironmentStringsA Lib "kernel32" ( _
    ByVal penv As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

FreeEnvironmentStringsA = ctypes.windll.kernel32.FreeEnvironmentStringsA
FreeEnvironmentStringsA.restype = wintypes.BOOL
FreeEnvironmentStringsA.argtypes = [
    wintypes.LPCSTR,  # penv : LPSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
FreeEnvironmentStringsA = Fiddle::Function.new(
  lib['FreeEnvironmentStringsA'],
  [
    Fiddle::TYPE_VOIDP,  # penv : LPSTR
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn FreeEnvironmentStringsA(
        penv: *mut u8  // LPSTR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool FreeEnvironmentStringsA([MarshalAs(UnmanagedType.LPStr)] string penv);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_FreeEnvironmentStringsA' -Namespace Win32 -PassThru
# $api::FreeEnvironmentStringsA(penv)

#uselib "KERNEL32.dll"
#func global FreeEnvironmentStringsA "FreeEnvironmentStringsA" sptr
; FreeEnvironmentStringsA penv   ; 戻り値は stat
; penv : LPSTR -> "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 FreeEnvironmentStringsA "FreeEnvironmentStringsA" str
; res = FreeEnvironmentStringsA(penv)
; penv : LPSTR -> "str"

; BOOL FreeEnvironmentStringsA(LPSTR penv)
#uselib "KERNEL32.dll"
#cfunc global FreeEnvironmentStringsA "FreeEnvironmentStringsA" str
; res = FreeEnvironmentStringsA(penv)
; penv : LPSTR -> "str"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procFreeEnvironmentStringsA = kernel32.NewProc("FreeEnvironmentStringsA")
)

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

function FreeEnvironmentStringsA(
  penv: PAnsiChar   // LPSTR
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'FreeEnvironmentStringsA';

result := DllCall("KERNEL32\FreeEnvironmentStringsA"
    , "AStr", penv   ; LPSTR
    , "Int")   ; return: BOOL

●FreeEnvironmentStringsA(penv) = DLL("KERNEL32.dll", "bool FreeEnvironmentStringsA(char*)")
# 呼び出し: FreeEnvironmentStringsA(penv)
# penv : LPSTR -> "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)。