GetProcessHandleCount

// KERNEL32.dll
#include <windows.h>

BOOL GetProcessHandleCount(
    HANDLE hProcess,
    DWORD* pdwHandleCount
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetProcessHandleCount(
    hProcess As IntPtr,   ' HANDLE
    <Out> ByRef pdwHandleCount As UInteger   ' DWORD* out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hProcess : HANDLE
' pdwHandleCount : DWORD* out
Declare PtrSafe Function GetProcessHandleCount Lib "kernel32" ( _
    ByVal hProcess As LongPtr, _
    ByRef pdwHandleCount 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

GetProcessHandleCount = ctypes.windll.kernel32.GetProcessHandleCount
GetProcessHandleCount.restype = wintypes.BOOL
GetProcessHandleCount.argtypes = [
    wintypes.HANDLE,  # hProcess : HANDLE
    ctypes.POINTER(wintypes.DWORD),  # pdwHandleCount : DWORD* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetProcessHandleCount = Fiddle::Function.new(
  lib['GetProcessHandleCount'],
  [
    Fiddle::TYPE_VOIDP,  # hProcess : HANDLE
    Fiddle::TYPE_VOIDP,  # pdwHandleCount : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetProcessHandleCount(
        hProcess: *mut core::ffi::c_void,  // HANDLE
        pdwHandleCount: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool GetProcessHandleCount(IntPtr hProcess, out uint pdwHandleCount);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetProcessHandleCount' -Namespace Win32 -PassThru
# $api::GetProcessHandleCount(hProcess, pdwHandleCount)

#uselib "KERNEL32.dll"
#func global GetProcessHandleCount "GetProcessHandleCount" sptr, sptr
; GetProcessHandleCount hProcess, varptr(pdwHandleCount)   ; 戻り値は stat
; hProcess : HANDLE -> "sptr"
; pdwHandleCount : DWORD* 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetProcessHandleCount = kernel32.NewProc("GetProcessHandleCount")
)

// hProcess (HANDLE), pdwHandleCount (DWORD* out)
r1, _, err := procGetProcessHandleCount.Call(
	uintptr(hProcess),
	uintptr(pdwHandleCount),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetProcessHandleCount(
  hProcess: THandle;   // HANDLE
  pdwHandleCount: Pointer   // DWORD* out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetProcessHandleCount';

result := DllCall("KERNEL32\GetProcessHandleCount"
    , "Ptr", hProcess   ; HANDLE
    , "Ptr", pdwHandleCount   ; DWORD* out
    , "Int")   ; return: BOOL

●GetProcessHandleCount(hProcess, pdwHandleCount) = DLL("KERNEL32.dll", "bool GetProcessHandleCount(void*, void*)")
# 呼び出し: GetProcessHandleCount(hProcess, pdwHandleCount)
# hProcess : HANDLE -> "void*"
# pdwHandleCount : DWORD* 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 "kernel32" fn GetProcessHandleCount(
    hProcess: ?*anyopaque, // HANDLE
    pdwHandleCount: [*c]u32 // DWORD* out
) callconv(std.os.windows.WINAPI) i32;

proc GetProcessHandleCount(
    hProcess: pointer,  # HANDLE
    pdwHandleCount: ptr uint32  # DWORD* out
): int32 {.importc: "GetProcessHandleCount", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
int GetProcessHandleCount(
    void* hProcess,   // HANDLE
    uint* pdwHandleCount   // DWORD* out
);

ccall((:GetProcessHandleCount, "KERNEL32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Ptr{UInt32}),
      hProcess, pdwHandleCount)
# hProcess : HANDLE -> Ptr{Cvoid}
# pdwHandleCount : DWORD* 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 GetProcessHandleCount(
    void* hProcess,
    uint32_t* pdwHandleCount);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.GetProcessHandleCount(hProcess, pdwHandleCount)
-- hProcess : HANDLE
-- pdwHandleCount : DWORD* 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('KERNEL32.dll');
const GetProcessHandleCount = lib.func('__stdcall', 'GetProcessHandleCount', 'int32_t', ['void *', 'uint32_t *']);
// GetProcessHandleCount(hProcess, pdwHandleCount)
// hProcess : HANDLE -> 'void *'
// pdwHandleCount : DWORD* 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("KERNEL32.dll", {
  GetProcessHandleCount: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.GetProcessHandleCount(hProcess, pdwHandleCount)
// hProcess : HANDLE -> "pointer"
// pdwHandleCount : DWORD* out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t GetProcessHandleCount(
    void* hProcess,
    uint32_t* pdwHandleCount);
C, "KERNEL32.dll");
// $ffi->GetProcessHandleCount(hProcess, pdwHandleCount);
// hProcess : HANDLE
// pdwHandleCount : DWORD* 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 Kernel32 extends StdCallLibrary {
    Kernel32 INSTANCE = Native.load("kernel32", Kernel32.class);
    boolean GetProcessHandleCount(
        Pointer hProcess,   // HANDLE
        IntByReference pdwHandleCount   // DWORD* out
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun GetProcessHandleCount = GetProcessHandleCount(
    hProcess : Void*,   # HANDLE
    pdwHandleCount : UInt32*   # DWORD* 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 GetProcessHandleCountNative = Int32 Function(Pointer<Void>, Pointer<Uint32>);
typedef GetProcessHandleCountDart = int Function(Pointer<Void>, Pointer<Uint32>);
final GetProcessHandleCount = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<GetProcessHandleCountNative, GetProcessHandleCountDart>('GetProcessHandleCount');
// hProcess : HANDLE -> Pointer<Void>
// pdwHandleCount : DWORD* out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetProcessHandleCount(
  hProcess: THandle;   // HANDLE
  pdwHandleCount: Pointer   // DWORD* out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetProcessHandleCount';

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

foreign import stdcall safe "GetProcessHandleCount"
  c_GetProcessHandleCount :: Ptr () -> Ptr Word32 -> IO CInt
-- hProcess : HANDLE -> Ptr ()
-- pdwHandleCount : DWORD* 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 getprocesshandlecount =
  foreign "GetProcessHandleCount"
    ((ptr void) @-> (ptr uint32_t) @-> returning int32_t)
(* hProcess : HANDLE -> (ptr void) *)
(* pdwHandleCount : DWORD* 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 kernel32 (t "KERNEL32.dll"))
(cffi:use-foreign-library kernel32)

(cffi:defcfun ("GetProcessHandleCount" get-process-handle-count :convention :stdcall) :int32
  (h-process :pointer)   ; HANDLE
  (pdw-handle-count :pointer))   ; DWORD* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetProcessHandleCount = Win32::API::More->new('KERNEL32',
    'BOOL GetProcessHandleCount(HANDLE hProcess, LPVOID pdwHandleCount)');
# my $ret = $GetProcessHandleCount->Call($hProcess, $pdwHandleCount);
# hProcess : HANDLE -> HANDLE
# pdwHandleCount : DWORD* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。