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 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。

#uselib "KERNEL32.dll"
#cfunc global GetProcessHandleCount "GetProcessHandleCount" sptr, var
; res = GetProcessHandleCount(hProcess, pdwHandleCount)
; hProcess : HANDLE -> "sptr"
; pdwHandleCount : DWORD* 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。

; BOOL GetProcessHandleCount(HANDLE hProcess, DWORD* pdwHandleCount)
#uselib "KERNEL32.dll"
#cfunc global GetProcessHandleCount "GetProcessHandleCount" intptr, var
; res = GetProcessHandleCount(hProcess, pdwHandleCount)
; hProcess : HANDLE -> "intptr"
; pdwHandleCount : DWORD* 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 (
	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)。