WslIsDistributionRegistered

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

BOOL WslIsDistributionRegistered(
    LPCWSTR distributionName
);

<DllImport("Api-ms-win-wsl-api-l1-1-0.dll", ExactSpelling:=True)>
Public Shared Function WslIsDistributionRegistered(
    <MarshalAs(UnmanagedType.LPWStr)> distributionName As String   ' LPCWSTR
) As Boolean
End Function

' distributionName : LPCWSTR
Declare PtrSafe Function WslIsDistributionRegistered Lib "api-ms-win-wsl-api-l1-1-0" ( _
    ByVal distributionName As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WslIsDistributionRegistered = ctypes.windll.LoadLibrary("Api-ms-win-wsl-api-l1-1-0.dll").WslIsDistributionRegistered
WslIsDistributionRegistered.restype = wintypes.BOOL
WslIsDistributionRegistered.argtypes = [
    wintypes.LPCWSTR,  # distributionName : LPCWSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('Api-ms-win-wsl-api-l1-1-0.dll')
WslIsDistributionRegistered = Fiddle::Function.new(
  lib['WslIsDistributionRegistered'],
  [
    Fiddle::TYPE_VOIDP,  # distributionName : LPCWSTR
  ],
  Fiddle::TYPE_INT)

#[link(name = "api-ms-win-wsl-api-l1-1-0")]
extern "system" {
    fn WslIsDistributionRegistered(
        distributionName: *const u16  // LPCWSTR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("Api-ms-win-wsl-api-l1-1-0.dll")]
public static extern bool WslIsDistributionRegistered([MarshalAs(UnmanagedType.LPWStr)] string distributionName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'Api-ms-win-wsl-api-l1-1-0_WslIsDistributionRegistered' -Namespace Win32 -PassThru
# $api::WslIsDistributionRegistered(distributionName)

#uselib "Api-ms-win-wsl-api-l1-1-0.dll"
#func global WslIsDistributionRegistered "WslIsDistributionRegistered" sptr
; WslIsDistributionRegistered distributionName   ; 戻り値は stat
; distributionName : LPCWSTR -> "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 "Api-ms-win-wsl-api-l1-1-0.dll"
#cfunc global WslIsDistributionRegistered "WslIsDistributionRegistered" wstr
; res = WslIsDistributionRegistered(distributionName)
; distributionName : LPCWSTR -> "wstr"

; BOOL WslIsDistributionRegistered(LPCWSTR distributionName)
#uselib "Api-ms-win-wsl-api-l1-1-0.dll"
#cfunc global WslIsDistributionRegistered "WslIsDistributionRegistered" wstr
; res = WslIsDistributionRegistered(distributionName)
; distributionName : LPCWSTR -> "wstr"

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

var (
	api_ms_win_wsl_api_l1_1_0 = windows.NewLazySystemDLL("Api-ms-win-wsl-api-l1-1-0.dll")
	procWslIsDistributionRegistered = api_ms_win_wsl_api_l1_1_0.NewProc("WslIsDistributionRegistered")
)

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

function WslIsDistributionRegistered(
  distributionName: PWideChar   // LPCWSTR
): BOOL; stdcall;
  external 'Api-ms-win-wsl-api-l1-1-0.dll' name 'WslIsDistributionRegistered';

result := DllCall("Api-ms-win-wsl-api-l1-1-0\WslIsDistributionRegistered"
    , "WStr", distributionName   ; LPCWSTR
    , "Int")   ; return: BOOL

●WslIsDistributionRegistered(distributionName) = DLL("Api-ms-win-wsl-api-l1-1-0.dll", "bool WslIsDistributionRegistered(char*)")
# 呼び出し: WslIsDistributionRegistered(distributionName)
# distributionName : LPCWSTR -> "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)。