WTSEnumerateProcessesA

// WTSAPI32.dll  (ANSI / -A)
#include <windows.h>

BOOL WTSEnumerateProcessesA(
    HANDLE hServer,   // optional
    DWORD Reserved,
    DWORD Version,
    WTS_PROCESS_INFOA** ppProcessInfo,
    DWORD* pCount
);

<DllImport("WTSAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WTSEnumerateProcessesA(
    hServer As IntPtr,   ' HANDLE optional
    Reserved As UInteger,   ' DWORD
    Version As UInteger,   ' DWORD
    ppProcessInfo As IntPtr,   ' WTS_PROCESS_INFOA** in/out
    ByRef pCount As UInteger   ' DWORD* in/out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hServer : HANDLE optional
' Reserved : DWORD
' Version : DWORD
' ppProcessInfo : WTS_PROCESS_INFOA** in/out
' pCount : DWORD* in/out
Declare PtrSafe Function WTSEnumerateProcessesA Lib "wtsapi32" ( _
    ByVal hServer As LongPtr, _
    ByVal Reserved As Long, _
    ByVal Version As Long, _
    ByVal ppProcessInfo As LongPtr, _
    ByRef pCount 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

WTSEnumerateProcessesA = ctypes.windll.wtsapi32.WTSEnumerateProcessesA
WTSEnumerateProcessesA.restype = wintypes.BOOL
WTSEnumerateProcessesA.argtypes = [
    wintypes.HANDLE,  # hServer : HANDLE optional
    wintypes.DWORD,  # Reserved : DWORD
    wintypes.DWORD,  # Version : DWORD
    ctypes.c_void_p,  # ppProcessInfo : WTS_PROCESS_INFOA** in/out
    ctypes.POINTER(wintypes.DWORD),  # pCount : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WTSAPI32.dll')
WTSEnumerateProcessesA = Fiddle::Function.new(
  lib['WTSEnumerateProcessesA'],
  [
    Fiddle::TYPE_VOIDP,  # hServer : HANDLE optional
    -Fiddle::TYPE_INT,  # Reserved : DWORD
    -Fiddle::TYPE_INT,  # Version : DWORD
    Fiddle::TYPE_VOIDP,  # ppProcessInfo : WTS_PROCESS_INFOA** in/out
    Fiddle::TYPE_VOIDP,  # pCount : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "wtsapi32")]
extern "system" {
    fn WTSEnumerateProcessesA(
        hServer: *mut core::ffi::c_void,  // HANDLE optional
        Reserved: u32,  // DWORD
        Version: u32,  // DWORD
        ppProcessInfo: *mut *mut WTS_PROCESS_INFOA,  // WTS_PROCESS_INFOA** in/out
        pCount: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WTSAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool WTSEnumerateProcessesA(IntPtr hServer, uint Reserved, uint Version, IntPtr ppProcessInfo, ref uint pCount);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WTSAPI32_WTSEnumerateProcessesA' -Namespace Win32 -PassThru
# $api::WTSEnumerateProcessesA(hServer, Reserved, Version, ppProcessInfo, pCount)

#uselib "WTSAPI32.dll"
#func global WTSEnumerateProcessesA "WTSEnumerateProcessesA" sptr, sptr, sptr, sptr, sptr
; WTSEnumerateProcessesA hServer, Reserved, Version, varptr(ppProcessInfo), varptr(pCount)   ; 戻り値は stat
; hServer : HANDLE optional -> "sptr"
; Reserved : DWORD -> "sptr"
; Version : DWORD -> "sptr"
; ppProcessInfo : WTS_PROCESS_INFOA** in/out -> "sptr"
; pCount : 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。

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

var (
	wtsapi32 = windows.NewLazySystemDLL("WTSAPI32.dll")
	procWTSEnumerateProcessesA = wtsapi32.NewProc("WTSEnumerateProcessesA")
)

// hServer (HANDLE optional), Reserved (DWORD), Version (DWORD), ppProcessInfo (WTS_PROCESS_INFOA** in/out), pCount (DWORD* in/out)
r1, _, err := procWTSEnumerateProcessesA.Call(
	uintptr(hServer),
	uintptr(Reserved),
	uintptr(Version),
	uintptr(ppProcessInfo),
	uintptr(pCount),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function WTSEnumerateProcessesA(
  hServer: THandle;   // HANDLE optional
  Reserved: DWORD;   // DWORD
  Version: DWORD;   // DWORD
  ppProcessInfo: Pointer;   // WTS_PROCESS_INFOA** in/out
  pCount: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'WTSAPI32.dll' name 'WTSEnumerateProcessesA';

result := DllCall("WTSAPI32\WTSEnumerateProcessesA"
    , "Ptr", hServer   ; HANDLE optional
    , "UInt", Reserved   ; DWORD
    , "UInt", Version   ; DWORD
    , "Ptr", ppProcessInfo   ; WTS_PROCESS_INFOA** in/out
    , "Ptr", pCount   ; DWORD* in/out
    , "Int")   ; return: BOOL

●WTSEnumerateProcessesA(hServer, Reserved, Version, ppProcessInfo, pCount) = DLL("WTSAPI32.dll", "bool WTSEnumerateProcessesA(void*, dword, dword, void*, void*)")
# 呼び出し: WTSEnumerateProcessesA(hServer, Reserved, Version, ppProcessInfo, pCount)
# hServer : HANDLE optional -> "void*"
# Reserved : DWORD -> "dword"
# Version : DWORD -> "dword"
# ppProcessInfo : WTS_PROCESS_INFOA** in/out -> "void*"
# pCount : 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)。

const std = @import("std");

extern "wtsapi32" fn WTSEnumerateProcessesA(
    hServer: ?*anyopaque, // HANDLE optional
    Reserved: u32, // DWORD
    Version: u32, // DWORD
    ppProcessInfo: [*c][*c]WTS_PROCESS_INFOA, // WTS_PROCESS_INFOA** in/out
    pCount: [*c]u32 // DWORD* in/out
) callconv(std.os.windows.WINAPI) i32;

proc WTSEnumerateProcessesA(
    hServer: pointer,  # HANDLE optional
    Reserved: uint32,  # DWORD
    Version: uint32,  # DWORD
    ppProcessInfo: ptr WTS_PROCESS_INFOA,  # WTS_PROCESS_INFOA** in/out
    pCount: ptr uint32  # DWORD* in/out
): int32 {.importc: "WTSEnumerateProcessesA", stdcall, dynlib: "WTSAPI32.dll".}

pragma(lib, "wtsapi32");
extern(Windows)
int WTSEnumerateProcessesA(
    void* hServer,   // HANDLE optional
    uint Reserved,   // DWORD
    uint Version,   // DWORD
    WTS_PROCESS_INFOA** ppProcessInfo,   // WTS_PROCESS_INFOA** in/out
    uint* pCount   // DWORD* in/out
);

ccall((:WTSEnumerateProcessesA, "WTSAPI32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, UInt32, UInt32, Ptr{WTS_PROCESS_INFOA}, Ptr{UInt32}),
      hServer, Reserved, Version, ppProcessInfo, pCount)
# hServer : HANDLE optional -> Ptr{Cvoid}
# Reserved : DWORD -> UInt32
# Version : DWORD -> UInt32
# ppProcessInfo : WTS_PROCESS_INFOA** in/out -> Ptr{WTS_PROCESS_INFOA}
# pCount : DWORD* in/out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t WTSEnumerateProcessesA(
    void* hServer,
    uint32_t Reserved,
    uint32_t Version,
    void* ppProcessInfo,
    uint32_t* pCount);
]]
local wtsapi32 = ffi.load("wtsapi32")
-- wtsapi32.WTSEnumerateProcessesA(hServer, Reserved, Version, ppProcessInfo, pCount)
-- hServer : HANDLE optional
-- Reserved : DWORD
-- Version : DWORD
-- ppProcessInfo : WTS_PROCESS_INFOA** in/out
-- pCount : DWORD* in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('WTSAPI32.dll');
const WTSEnumerateProcessesA = lib.func('__stdcall', 'WTSEnumerateProcessesA', 'int32_t', ['void *', 'uint32_t', 'uint32_t', 'void *', 'uint32_t *']);
// WTSEnumerateProcessesA(hServer, Reserved, Version, ppProcessInfo, pCount)
// hServer : HANDLE optional -> 'void *'
// Reserved : DWORD -> 'uint32_t'
// Version : DWORD -> 'uint32_t'
// ppProcessInfo : WTS_PROCESS_INFOA** in/out -> 'void *'
// pCount : DWORD* in/out -> 'uint32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("WTSAPI32.dll", {
  WTSEnumerateProcessesA: { parameters: ["pointer", "u32", "u32", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.WTSEnumerateProcessesA(hServer, Reserved, Version, ppProcessInfo, pCount)
// hServer : HANDLE optional -> "pointer"
// Reserved : DWORD -> "u32"
// Version : DWORD -> "u32"
// ppProcessInfo : WTS_PROCESS_INFOA** in/out -> "pointer"
// pCount : DWORD* in/out -> "pointer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t WTSEnumerateProcessesA(
    void* hServer,
    uint32_t Reserved,
    uint32_t Version,
    void* ppProcessInfo,
    uint32_t* pCount);
C, "WTSAPI32.dll");
// $ffi->WTSEnumerateProcessesA(hServer, Reserved, Version, ppProcessInfo, pCount);
// hServer : HANDLE optional
// Reserved : DWORD
// Version : DWORD
// ppProcessInfo : WTS_PROCESS_INFOA** in/out
// pCount : DWORD* in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Wtsapi32 extends StdCallLibrary {
    Wtsapi32 INSTANCE = Native.load("wtsapi32", Wtsapi32.class, W32APIOptions.ASCII_OPTIONS);
    boolean WTSEnumerateProcessesA(
        Pointer hServer,   // HANDLE optional
        int Reserved,   // DWORD
        int Version,   // DWORD
        Pointer ppProcessInfo,   // WTS_PROCESS_INFOA** in/out
        IntByReference pCount   // DWORD* in/out
    );
}

@[Link("wtsapi32")]
lib LibWTSAPI32
  fun WTSEnumerateProcessesA = WTSEnumerateProcessesA(
    hServer : Void*,   # HANDLE optional
    Reserved : UInt32,   # DWORD
    Version : UInt32,   # DWORD
    ppProcessInfo : WTS_PROCESS_INFOA**,   # WTS_PROCESS_INFOA** in/out
    pCount : UInt32*   # DWORD* in/out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef WTSEnumerateProcessesANative = Int32 Function(Pointer<Void>, Uint32, Uint32, Pointer<Void>, Pointer<Uint32>);
typedef WTSEnumerateProcessesADart = int Function(Pointer<Void>, int, int, Pointer<Void>, Pointer<Uint32>);
final WTSEnumerateProcessesA = DynamicLibrary.open('WTSAPI32.dll')
    .lookupFunction<WTSEnumerateProcessesANative, WTSEnumerateProcessesADart>('WTSEnumerateProcessesA');
// hServer : HANDLE optional -> Pointer<Void>
// Reserved : DWORD -> Uint32
// Version : DWORD -> Uint32
// ppProcessInfo : WTS_PROCESS_INFOA** in/out -> Pointer<Void>
// pCount : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function WTSEnumerateProcessesA(
  hServer: THandle;   // HANDLE optional
  Reserved: DWORD;   // DWORD
  Version: DWORD;   // DWORD
  ppProcessInfo: Pointer;   // WTS_PROCESS_INFOA** in/out
  pCount: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'WTSAPI32.dll' name 'WTSEnumerateProcessesA';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "WTSEnumerateProcessesA"
  c_WTSEnumerateProcessesA :: Ptr () -> Word32 -> Word32 -> Ptr () -> Ptr Word32 -> IO CInt
-- hServer : HANDLE optional -> Ptr ()
-- Reserved : DWORD -> Word32
-- Version : DWORD -> Word32
-- ppProcessInfo : WTS_PROCESS_INFOA** in/out -> Ptr ()
-- pCount : DWORD* in/out -> Ptr Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let wtsenumerateprocessesa =
  foreign "WTSEnumerateProcessesA"
    ((ptr void) @-> uint32_t @-> uint32_t @-> (ptr void) @-> (ptr uint32_t) @-> returning int32_t)
(* hServer : HANDLE optional -> (ptr void) *)
(* Reserved : DWORD -> uint32_t *)
(* Version : DWORD -> uint32_t *)
(* ppProcessInfo : WTS_PROCESS_INFOA** in/out -> (ptr void) *)
(* pCount : DWORD* in/out -> (ptr uint32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library wtsapi32 (t "WTSAPI32.dll"))
(cffi:use-foreign-library wtsapi32)

(cffi:defcfun ("WTSEnumerateProcessesA" wtsenumerate-processes-a :convention :stdcall) :int32
  (h-server :pointer)   ; HANDLE optional
  (reserved :uint32)   ; DWORD
  (version :uint32)   ; DWORD
  (pp-process-info :pointer)   ; WTS_PROCESS_INFOA** in/out
  (p-count :pointer))   ; DWORD* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $WTSEnumerateProcessesA = Win32::API::More->new('WTSAPI32',
    'BOOL WTSEnumerateProcessesA(HANDLE hServer, DWORD Reserved, DWORD Version, LPVOID ppProcessInfo, LPVOID pCount)');
# my $ret = $WTSEnumerateProcessesA->Call($hServer, $Reserved, $Version, $ppProcessInfo, $pCount);
# hServer : HANDLE optional -> HANDLE
# Reserved : DWORD -> DWORD
# Version : DWORD -> DWORD
# ppProcessInfo : WTS_PROCESS_INFOA** in/out -> LPVOID
# pCount : DWORD* in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。