SCardListReaderGroupsW

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

INT SCardListReaderGroupsW(
    UINT_PTR hContext,
    LPWSTR mszGroups,   // optional
    DWORD* pcchGroups
);

<DllImport("WinSCard.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SCardListReaderGroupsW(
    hContext As UIntPtr,   ' UINT_PTR
    <MarshalAs(UnmanagedType.LPWStr)> mszGroups As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pcchGroups As UInteger   ' DWORD* in/out
) As Integer
End Function

' hContext : UINT_PTR
' mszGroups : LPWSTR optional, out
' pcchGroups : DWORD* in/out
Declare PtrSafe Function SCardListReaderGroupsW Lib "winscard" ( _
    ByVal hContext As LongPtr, _
    ByVal mszGroups As LongPtr, _
    ByRef pcchGroups As Long) 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

SCardListReaderGroupsW = ctypes.windll.winscard.SCardListReaderGroupsW
SCardListReaderGroupsW.restype = ctypes.c_int
SCardListReaderGroupsW.argtypes = [
    ctypes.c_size_t,  # hContext : UINT_PTR
    wintypes.LPWSTR,  # mszGroups : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchGroups : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WinSCard.dll')
SCardListReaderGroupsW = Fiddle::Function.new(
  lib['SCardListReaderGroupsW'],
  [
    Fiddle::TYPE_UINTPTR_T,  # hContext : UINT_PTR
    Fiddle::TYPE_VOIDP,  # mszGroups : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchGroups : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winscard")]
extern "system" {
    fn SCardListReaderGroupsW(
        hContext: usize,  // UINT_PTR
        mszGroups: *mut u16,  // LPWSTR optional, out
        pcchGroups: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WinSCard.dll", CharSet = CharSet.Unicode)]
public static extern int SCardListReaderGroupsW(UIntPtr hContext, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder mszGroups, ref uint pcchGroups);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WinSCard_SCardListReaderGroupsW' -Namespace Win32 -PassThru
# $api::SCardListReaderGroupsW(hContext, mszGroups, pcchGroups)

#uselib "WinSCard.dll"
#func global SCardListReaderGroupsW "SCardListReaderGroupsW" wptr, wptr, wptr
; SCardListReaderGroupsW hContext, varptr(mszGroups), varptr(pcchGroups)   ; 戻り値は stat
; hContext : UINT_PTR -> "wptr"
; mszGroups : LPWSTR optional, out -> "wptr"
; pcchGroups : DWORD* in/out -> "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 "WinSCard.dll"
#cfunc global SCardListReaderGroupsW "SCardListReaderGroupsW" sptr, var, var
; res = SCardListReaderGroupsW(hContext, mszGroups, pcchGroups)
; hContext : UINT_PTR -> "sptr"
; mszGroups : LPWSTR optional, out -> "var"
; pcchGroups : DWORD* in/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。

; INT SCardListReaderGroupsW(UINT_PTR hContext, LPWSTR mszGroups, DWORD* pcchGroups)
#uselib "WinSCard.dll"
#cfunc global SCardListReaderGroupsW "SCardListReaderGroupsW" intptr, var, var
; res = SCardListReaderGroupsW(hContext, mszGroups, pcchGroups)
; hContext : UINT_PTR -> "intptr"
; mszGroups : LPWSTR optional, out -> "var"
; pcchGroups : DWORD* in/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。

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

var (
	winscard = windows.NewLazySystemDLL("WinSCard.dll")
	procSCardListReaderGroupsW = winscard.NewProc("SCardListReaderGroupsW")
)

// hContext (UINT_PTR), mszGroups (LPWSTR optional, out), pcchGroups (DWORD* in/out)
r1, _, err := procSCardListReaderGroupsW.Call(
	uintptr(hContext),
	uintptr(mszGroups),
	uintptr(pcchGroups),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SCardListReaderGroupsW(
  hContext: NativeUInt;   // UINT_PTR
  mszGroups: PWideChar;   // LPWSTR optional, out
  pcchGroups: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'WinSCard.dll' name 'SCardListReaderGroupsW';

result := DllCall("WinSCard\SCardListReaderGroupsW"
    , "UPtr", hContext   ; UINT_PTR
    , "Ptr", mszGroups   ; LPWSTR optional, out
    , "Ptr", pcchGroups   ; DWORD* in/out
    , "Int")   ; return: INT

●SCardListReaderGroupsW(hContext, mszGroups, pcchGroups) = DLL("WinSCard.dll", "int SCardListReaderGroupsW(int, char*, void*)")
# 呼び出し: SCardListReaderGroupsW(hContext, mszGroups, pcchGroups)
# hContext : UINT_PTR -> "int"
# mszGroups : LPWSTR optional, out -> "char*"
# pcchGroups : DWORD* in/out -> "void*"
# 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。