GetProcessMemoryInfo

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

BOOL GetProcessMemoryInfo(
    HANDLE Process,
    PROCESS_MEMORY_COUNTERS* ppsmemCounters,
    DWORD cb
);

<DllImport("PSAPI.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetProcessMemoryInfo(
    Process As IntPtr,   ' HANDLE
    ppsmemCounters As IntPtr,   ' PROCESS_MEMORY_COUNTERS* out
    cb As UInteger   ' DWORD
) As Boolean
End Function

' Process : HANDLE
' ppsmemCounters : PROCESS_MEMORY_COUNTERS* out
' cb : DWORD
Declare PtrSafe Function GetProcessMemoryInfo Lib "psapi" ( _
    ByVal Process As LongPtr, _
    ByVal ppsmemCounters As LongPtr, _
    ByVal cb 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

GetProcessMemoryInfo = ctypes.windll.psapi.GetProcessMemoryInfo
GetProcessMemoryInfo.restype = wintypes.BOOL
GetProcessMemoryInfo.argtypes = [
    wintypes.HANDLE,  # Process : HANDLE
    ctypes.c_void_p,  # ppsmemCounters : PROCESS_MEMORY_COUNTERS* out
    wintypes.DWORD,  # cb : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PSAPI.dll')
GetProcessMemoryInfo = Fiddle::Function.new(
  lib['GetProcessMemoryInfo'],
  [
    Fiddle::TYPE_VOIDP,  # Process : HANDLE
    Fiddle::TYPE_VOIDP,  # ppsmemCounters : PROCESS_MEMORY_COUNTERS* out
    -Fiddle::TYPE_INT,  # cb : DWORD
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("PSAPI.dll", SetLastError = true)]
public static extern bool GetProcessMemoryInfo(IntPtr Process, IntPtr ppsmemCounters, uint cb);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PSAPI_GetProcessMemoryInfo' -Namespace Win32 -PassThru
# $api::GetProcessMemoryInfo(Process, ppsmemCounters, cb)

#uselib "PSAPI.dll"
#func global GetProcessMemoryInfo "GetProcessMemoryInfo" sptr, sptr, sptr
; GetProcessMemoryInfo Process, varptr(ppsmemCounters), cb   ; 戻り値は stat
; Process : HANDLE -> "sptr"
; ppsmemCounters : PROCESS_MEMORY_COUNTERS* out -> "sptr"
; cb : DWORD -> "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 "PSAPI.dll"
#cfunc global GetProcessMemoryInfo "GetProcessMemoryInfo" sptr, var, int
; res = GetProcessMemoryInfo(Process, ppsmemCounters, cb)
; Process : HANDLE -> "sptr"
; ppsmemCounters : PROCESS_MEMORY_COUNTERS* out -> "var"
; cb : DWORD -> "int"
; ※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 GetProcessMemoryInfo(HANDLE Process, PROCESS_MEMORY_COUNTERS* ppsmemCounters, DWORD cb)
#uselib "PSAPI.dll"
#cfunc global GetProcessMemoryInfo "GetProcessMemoryInfo" intptr, var, int
; res = GetProcessMemoryInfo(Process, ppsmemCounters, cb)
; Process : HANDLE -> "intptr"
; ppsmemCounters : PROCESS_MEMORY_COUNTERS* out -> "var"
; cb : DWORD -> "int"
; ※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 (
	psapi = windows.NewLazySystemDLL("PSAPI.dll")
	procGetProcessMemoryInfo = psapi.NewProc("GetProcessMemoryInfo")
)

// Process (HANDLE), ppsmemCounters (PROCESS_MEMORY_COUNTERS* out), cb (DWORD)
r1, _, err := procGetProcessMemoryInfo.Call(
	uintptr(Process),
	uintptr(ppsmemCounters),
	uintptr(cb),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetProcessMemoryInfo(
  Process: THandle;   // HANDLE
  ppsmemCounters: Pointer;   // PROCESS_MEMORY_COUNTERS* out
  cb: DWORD   // DWORD
): BOOL; stdcall;
  external 'PSAPI.dll' name 'GetProcessMemoryInfo';

result := DllCall("PSAPI\GetProcessMemoryInfo"
    , "Ptr", Process   ; HANDLE
    , "Ptr", ppsmemCounters   ; PROCESS_MEMORY_COUNTERS* out
    , "UInt", cb   ; DWORD
    , "Int")   ; return: BOOL

●GetProcessMemoryInfo(Process, ppsmemCounters, cb) = DLL("PSAPI.dll", "bool GetProcessMemoryInfo(void*, void*, dword)")
# 呼び出し: GetProcessMemoryInfo(Process, ppsmemCounters, cb)
# Process : HANDLE -> "void*"
# ppsmemCounters : PROCESS_MEMORY_COUNTERS* out -> "void*"
# cb : DWORD -> "dword"
# 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)。