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GetLogicalDriveStringsA

関数

システム上の有効な論理ドライブの文字列一覧を取得する(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>

DWORD GetLogicalDriveStringsA(
    DWORD nBufferLength,
    LPSTR lpBuffer   // optional
);

パラメーター

名前	型	方向
nBufferLength	DWORD	in
lpBuffer	LPSTR	outoptional

戻り値の型: DWORD

各言語での呼び出し定義

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

DWORD GetLogicalDriveStringsA(
    DWORD nBufferLength,
    LPSTR lpBuffer   // optional
);

[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
static extern uint GetLogicalDriveStringsA(
    uint nBufferLength,   // DWORD
    [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpBuffer   // LPSTR optional, out
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetLogicalDriveStringsA(
    nBufferLength As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> lpBuffer As System.Text.StringBuilder   ' LPSTR optional, out
) As UInteger
End Function

' nBufferLength : DWORD
' lpBuffer : LPSTR optional, out
Declare PtrSafe Function GetLogicalDriveStringsA Lib "kernel32" ( _
    ByVal nBufferLength As Long, _
    ByVal lpBuffer 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

GetLogicalDriveStringsA = ctypes.windll.kernel32.GetLogicalDriveStringsA
GetLogicalDriveStringsA.restype = wintypes.DWORD
GetLogicalDriveStringsA.argtypes = [
    wintypes.DWORD,  # nBufferLength : DWORD
    wintypes.LPSTR,  # lpBuffer : LPSTR optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetLogicalDriveStringsA = Fiddle::Function.new(
  lib['GetLogicalDriveStringsA'],
  [
    -Fiddle::TYPE_INT,  # nBufferLength : DWORD
    Fiddle::TYPE_VOIDP,  # lpBuffer : LPSTR optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetLogicalDriveStringsA(
        nBufferLength: u32,  // DWORD
        lpBuffer: *mut u8  // LPSTR optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern uint GetLogicalDriveStringsA(uint nBufferLength, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetLogicalDriveStringsA' -Namespace Win32 -PassThru
# $api::GetLogicalDriveStringsA(nBufferLength, lpBuffer)

#uselib "KERNEL32.dll"
#func global GetLogicalDriveStringsA "GetLogicalDriveStringsA" sptr, sptr
; GetLogicalDriveStringsA nBufferLength, varptr(lpBuffer)   ; 戻り値は stat
; nBufferLength : DWORD -> "sptr"
; lpBuffer : LPSTR optional, 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 "KERNEL32.dll"
#cfunc global GetLogicalDriveStringsA "GetLogicalDriveStringsA" int, var
; res = GetLogicalDriveStringsA(nBufferLength, lpBuffer)
; nBufferLength : DWORD -> "int"
; lpBuffer : LPSTR optional, 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 "KERNEL32.dll"
#cfunc global GetLogicalDriveStringsA "GetLogicalDriveStringsA" int, sptr
; res = GetLogicalDriveStringsA(nBufferLength, varptr(lpBuffer))
; nBufferLength : DWORD -> "int"
; lpBuffer : LPSTR optional, 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:

; DWORD GetLogicalDriveStringsA(DWORD nBufferLength, LPSTR lpBuffer)
#uselib "KERNEL32.dll"
#cfunc global GetLogicalDriveStringsA "GetLogicalDriveStringsA" int, var
; res = GetLogicalDriveStringsA(nBufferLength, lpBuffer)
; nBufferLength : DWORD -> "int"
; lpBuffer : LPSTR optional, 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。; DWORD GetLogicalDriveStringsA(DWORD nBufferLength, LPSTR lpBuffer)
#uselib "KERNEL32.dll"
#cfunc global GetLogicalDriveStringsA "GetLogicalDriveStringsA" int, intptr
; res = GetLogicalDriveStringsA(nBufferLength, varptr(lpBuffer))
; nBufferLength : DWORD -> "int"
; lpBuffer : LPSTR optional, 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetLogicalDriveStringsA = kernel32.NewProc("GetLogicalDriveStringsA")
)

// nBufferLength (DWORD), lpBuffer (LPSTR optional, out)
r1, _, err := procGetLogicalDriveStringsA.Call(
	uintptr(nBufferLength),
	uintptr(lpBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetLogicalDriveStringsA(
  nBufferLength: DWORD;   // DWORD
  lpBuffer: PAnsiChar   // LPSTR optional, out
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetLogicalDriveStringsA';

result := DllCall("KERNEL32\GetLogicalDriveStringsA"
    , "UInt", nBufferLength   ; DWORD
    , "Ptr", lpBuffer   ; LPSTR optional, out
    , "UInt")   ; return: DWORD

●GetLogicalDriveStringsA(nBufferLength, lpBuffer) = DLL("KERNEL32.dll", "dword GetLogicalDriveStringsA(dword, char*)")
# 呼び出し: GetLogicalDriveStringsA(nBufferLength, lpBuffer)
# nBufferLength : DWORD -> "dword"
# lpBuffer : LPSTR optional, out -> "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)。