SCardListReadersA

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

INT SCardListReadersA(
    UINT_PTR hContext,
    LPCSTR mszGroups,   // optional
    LPSTR mszReaders,   // optional
    DWORD* pcchReaders
);

<DllImport("WinSCard.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SCardListReadersA(
    hContext As UIntPtr,   ' UINT_PTR
    <MarshalAs(UnmanagedType.LPStr)> mszGroups As String,   ' LPCSTR optional
    <MarshalAs(UnmanagedType.LPStr)> mszReaders As System.Text.StringBuilder,   ' LPSTR optional, out
    ByRef pcchReaders As UInteger   ' DWORD* in/out
) As Integer
End Function

' hContext : UINT_PTR
' mszGroups : LPCSTR optional
' mszReaders : LPSTR optional, out
' pcchReaders : DWORD* in/out
Declare PtrSafe Function SCardListReadersA Lib "winscard" ( _
    ByVal hContext As LongPtr, _
    ByVal mszGroups As String, _
    ByVal mszReaders As String, _
    ByRef pcchReaders 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

SCardListReadersA = ctypes.windll.winscard.SCardListReadersA
SCardListReadersA.restype = ctypes.c_int
SCardListReadersA.argtypes = [
    ctypes.c_size_t,  # hContext : UINT_PTR
    wintypes.LPCSTR,  # mszGroups : LPCSTR optional
    wintypes.LPSTR,  # mszReaders : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchReaders : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WinSCard.dll')
SCardListReadersA = Fiddle::Function.new(
  lib['SCardListReadersA'],
  [
    Fiddle::TYPE_UINTPTR_T,  # hContext : UINT_PTR
    Fiddle::TYPE_VOIDP,  # mszGroups : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # mszReaders : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchReaders : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "winscard")]
extern "system" {
    fn SCardListReadersA(
        hContext: usize,  // UINT_PTR
        mszGroups: *const u8,  // LPCSTR optional
        mszReaders: *mut u8,  // LPSTR optional, out
        pcchReaders: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WinSCard.dll", CharSet = CharSet.Ansi)]
public static extern int SCardListReadersA(UIntPtr hContext, [MarshalAs(UnmanagedType.LPStr)] string mszGroups, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder mszReaders, ref uint pcchReaders);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WinSCard_SCardListReadersA' -Namespace Win32 -PassThru
# $api::SCardListReadersA(hContext, mszGroups, mszReaders, pcchReaders)

#uselib "WinSCard.dll"
#func global SCardListReadersA "SCardListReadersA" sptr, sptr, sptr, sptr
; SCardListReadersA hContext, mszGroups, varptr(mszReaders), varptr(pcchReaders)   ; 戻り値は stat
; hContext : UINT_PTR -> "sptr"
; mszGroups : LPCSTR optional -> "sptr"
; mszReaders : LPSTR optional, out -> "sptr"
; pcchReaders : DWORD* in/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。

#uselib "WinSCard.dll"
#cfunc global SCardListReadersA "SCardListReadersA" sptr, str, var, var
; res = SCardListReadersA(hContext, mszGroups, mszReaders, pcchReaders)
; hContext : UINT_PTR -> "sptr"
; mszGroups : LPCSTR optional -> "str"
; mszReaders : LPSTR optional, out -> "var"
; pcchReaders : 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 SCardListReadersA(UINT_PTR hContext, LPCSTR mszGroups, LPSTR mszReaders, DWORD* pcchReaders)
#uselib "WinSCard.dll"
#cfunc global SCardListReadersA "SCardListReadersA" intptr, str, var, var
; res = SCardListReadersA(hContext, mszGroups, mszReaders, pcchReaders)
; hContext : UINT_PTR -> "intptr"
; mszGroups : LPCSTR optional -> "str"
; mszReaders : LPSTR optional, out -> "var"
; pcchReaders : 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")
	procSCardListReadersA = winscard.NewProc("SCardListReadersA")
)

// hContext (UINT_PTR), mszGroups (LPCSTR optional), mszReaders (LPSTR optional, out), pcchReaders (DWORD* in/out)
r1, _, err := procSCardListReadersA.Call(
	uintptr(hContext),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(mszGroups))),
	uintptr(mszReaders),
	uintptr(pcchReaders),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SCardListReadersA(
  hContext: NativeUInt;   // UINT_PTR
  mszGroups: PAnsiChar;   // LPCSTR optional
  mszReaders: PAnsiChar;   // LPSTR optional, out
  pcchReaders: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'WinSCard.dll' name 'SCardListReadersA';

result := DllCall("WinSCard\SCardListReadersA"
    , "UPtr", hContext   ; UINT_PTR
    , "AStr", mszGroups   ; LPCSTR optional
    , "Ptr", mszReaders   ; LPSTR optional, out
    , "Ptr", pcchReaders   ; DWORD* in/out
    , "Int")   ; return: INT

●SCardListReadersA(hContext, mszGroups, mszReaders, pcchReaders) = DLL("WinSCard.dll", "int SCardListReadersA(int, char*, char*, void*)")
# 呼び出し: SCardListReadersA(hContext, mszGroups, mszReaders, pcchReaders)
# hContext : UINT_PTR -> "int"
# mszGroups : LPCSTR optional -> "char*"
# mszReaders : LPSTR optional, out -> "char*"
# pcchReaders : 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)。