GetVolumeNameForVolumeMountPointA

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

BOOL GetVolumeNameForVolumeMountPointA(
    LPCSTR lpszVolumeMountPoint,
    LPSTR lpszVolumeName,
    DWORD cchBufferLength
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetVolumeNameForVolumeMountPointA(
    <MarshalAs(UnmanagedType.LPStr)> lpszVolumeMountPoint As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> lpszVolumeName As System.Text.StringBuilder,   ' LPSTR out
    cchBufferLength As UInteger   ' DWORD
) As Boolean
End Function

' lpszVolumeMountPoint : LPCSTR
' lpszVolumeName : LPSTR out
' cchBufferLength : DWORD
Declare PtrSafe Function GetVolumeNameForVolumeMountPointA Lib "kernel32" ( _
    ByVal lpszVolumeMountPoint As String, _
    ByVal lpszVolumeName As String, _
    ByVal cchBufferLength As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetVolumeNameForVolumeMountPointA = ctypes.windll.kernel32.GetVolumeNameForVolumeMountPointA
GetVolumeNameForVolumeMountPointA.restype = wintypes.BOOL
GetVolumeNameForVolumeMountPointA.argtypes = [
    wintypes.LPCSTR,  # lpszVolumeMountPoint : LPCSTR
    wintypes.LPSTR,  # lpszVolumeName : LPSTR out
    wintypes.DWORD,  # cchBufferLength : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetVolumeNameForVolumeMountPointA = Fiddle::Function.new(
  lib['GetVolumeNameForVolumeMountPointA'],
  [
    Fiddle::TYPE_VOIDP,  # lpszVolumeMountPoint : LPCSTR
    Fiddle::TYPE_VOIDP,  # lpszVolumeName : LPSTR out
    -Fiddle::TYPE_INT,  # cchBufferLength : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetVolumeNameForVolumeMountPointA(
        lpszVolumeMountPoint: *const u8,  // LPCSTR
        lpszVolumeName: *mut u8,  // LPSTR out
        cchBufferLength: u32  // DWORD
    ) -> 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 GetVolumeNameForVolumeMountPointA([MarshalAs(UnmanagedType.LPStr)] string lpszVolumeMountPoint, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpszVolumeName, uint cchBufferLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetVolumeNameForVolumeMountPointA' -Namespace Win32 -PassThru
# $api::GetVolumeNameForVolumeMountPointA(lpszVolumeMountPoint, lpszVolumeName, cchBufferLength)

#uselib "KERNEL32.dll"
#func global GetVolumeNameForVolumeMountPointA "GetVolumeNameForVolumeMountPointA" sptr, sptr, sptr
; GetVolumeNameForVolumeMountPointA lpszVolumeMountPoint, varptr(lpszVolumeName), cchBufferLength   ; 戻り値は stat
; lpszVolumeMountPoint : LPCSTR -> "sptr"
; lpszVolumeName : LPSTR out -> "sptr"
; cchBufferLength : DWORD -> "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 GetVolumeNameForVolumeMountPointA "GetVolumeNameForVolumeMountPointA" str, var, int
; res = GetVolumeNameForVolumeMountPointA(lpszVolumeMountPoint, lpszVolumeName, cchBufferLength)
; lpszVolumeMountPoint : LPCSTR -> "str"
; lpszVolumeName : LPSTR out -> "var"
; cchBufferLength : DWORD -> "int"
; ※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。

; BOOL GetVolumeNameForVolumeMountPointA(LPCSTR lpszVolumeMountPoint, LPSTR lpszVolumeName, DWORD cchBufferLength)
#uselib "KERNEL32.dll"
#cfunc global GetVolumeNameForVolumeMountPointA "GetVolumeNameForVolumeMountPointA" str, var, int
; res = GetVolumeNameForVolumeMountPointA(lpszVolumeMountPoint, lpszVolumeName, cchBufferLength)
; lpszVolumeMountPoint : LPCSTR -> "str"
; lpszVolumeName : LPSTR out -> "var"
; cchBufferLength : DWORD -> "int"
; ※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。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetVolumeNameForVolumeMountPointA = kernel32.NewProc("GetVolumeNameForVolumeMountPointA")
)

// lpszVolumeMountPoint (LPCSTR), lpszVolumeName (LPSTR out), cchBufferLength (DWORD)
r1, _, err := procGetVolumeNameForVolumeMountPointA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpszVolumeMountPoint))),
	uintptr(lpszVolumeName),
	uintptr(cchBufferLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetVolumeNameForVolumeMountPointA(
  lpszVolumeMountPoint: PAnsiChar;   // LPCSTR
  lpszVolumeName: PAnsiChar;   // LPSTR out
  cchBufferLength: DWORD   // DWORD
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetVolumeNameForVolumeMountPointA';

result := DllCall("KERNEL32\GetVolumeNameForVolumeMountPointA"
    , "AStr", lpszVolumeMountPoint   ; LPCSTR
    , "Ptr", lpszVolumeName   ; LPSTR out
    , "UInt", cchBufferLength   ; DWORD
    , "Int")   ; return: BOOL

●GetVolumeNameForVolumeMountPointA(lpszVolumeMountPoint, lpszVolumeName, cchBufferLength) = DLL("KERNEL32.dll", "bool GetVolumeNameForVolumeMountPointA(char*, char*, dword)")
# 呼び出し: GetVolumeNameForVolumeMountPointA(lpszVolumeMountPoint, lpszVolumeName, cchBufferLength)
# lpszVolumeMountPoint : LPCSTR -> "char*"
# lpszVolumeName : LPSTR out -> "char*"
# cchBufferLength : DWORD -> "dword"
# 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)。