K32EnumProcesses

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

BOOL K32EnumProcesses(
    DWORD* lpidProcess,
    DWORD cb,
    DWORD* lpcbNeeded
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function K32EnumProcesses(
    <Out> ByRef lpidProcess As UInteger,   ' DWORD* out
    cb As UInteger,   ' DWORD
    <Out> ByRef lpcbNeeded As UInteger   ' DWORD* out
) As Boolean
End Function

' lpidProcess : DWORD* out
' cb : DWORD
' lpcbNeeded : DWORD* out
Declare PtrSafe Function K32EnumProcesses Lib "kernel32" ( _
    ByRef lpidProcess As Long, _
    ByVal cb As Long, _
    ByRef lpcbNeeded 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

K32EnumProcesses = ctypes.windll.kernel32.K32EnumProcesses
K32EnumProcesses.restype = wintypes.BOOL
K32EnumProcesses.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # lpidProcess : DWORD* out
    wintypes.DWORD,  # cb : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpcbNeeded : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
K32EnumProcesses = Fiddle::Function.new(
  lib['K32EnumProcesses'],
  [
    Fiddle::TYPE_VOIDP,  # lpidProcess : DWORD* out
    -Fiddle::TYPE_INT,  # cb : DWORD
    Fiddle::TYPE_VOIDP,  # lpcbNeeded : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn K32EnumProcesses(
        lpidProcess: *mut u32,  // DWORD* out
        cb: u32,  // DWORD
        lpcbNeeded: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll")]
public static extern bool K32EnumProcesses(out uint lpidProcess, uint cb, out uint lpcbNeeded);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_K32EnumProcesses' -Namespace Win32 -PassThru
# $api::K32EnumProcesses(lpidProcess, cb, lpcbNeeded)

#uselib "KERNEL32.dll"
#func global K32EnumProcesses "K32EnumProcesses" sptr, sptr, sptr
; K32EnumProcesses varptr(lpidProcess), cb, varptr(lpcbNeeded)   ; 戻り値は stat
; lpidProcess : DWORD* out -> "sptr"
; cb : DWORD -> "sptr"
; lpcbNeeded : 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 K32EnumProcesses "K32EnumProcesses" var, int, var
; res = K32EnumProcesses(lpidProcess, cb, lpcbNeeded)
; lpidProcess : DWORD* out -> "var"
; cb : DWORD -> "int"
; lpcbNeeded : 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 K32EnumProcesses(DWORD* lpidProcess, DWORD cb, DWORD* lpcbNeeded)
#uselib "KERNEL32.dll"
#cfunc global K32EnumProcesses "K32EnumProcesses" var, int, var
; res = K32EnumProcesses(lpidProcess, cb, lpcbNeeded)
; lpidProcess : DWORD* out -> "var"
; cb : DWORD -> "int"
; lpcbNeeded : 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")
	procK32EnumProcesses = kernel32.NewProc("K32EnumProcesses")
)

// lpidProcess (DWORD* out), cb (DWORD), lpcbNeeded (DWORD* out)
r1, _, err := procK32EnumProcesses.Call(
	uintptr(lpidProcess),
	uintptr(cb),
	uintptr(lpcbNeeded),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function K32EnumProcesses(
  lpidProcess: Pointer;   // DWORD* out
  cb: DWORD;   // DWORD
  lpcbNeeded: Pointer   // DWORD* out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'K32EnumProcesses';

result := DllCall("KERNEL32\K32EnumProcesses"
    , "Ptr", lpidProcess   ; DWORD* out
    , "UInt", cb   ; DWORD
    , "Ptr", lpcbNeeded   ; DWORD* out
    , "Int")   ; return: BOOL

●K32EnumProcesses(lpidProcess, cb, lpcbNeeded) = DLL("KERNEL32.dll", "bool K32EnumProcesses(void*, dword, void*)")
# 呼び出し: K32EnumProcesses(lpidProcess, cb, lpcbNeeded)
# lpidProcess : DWORD* out -> "void*"
# cb : DWORD -> "dword"
# lpcbNeeded : 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)。