PdhGetCounterInfoW

// pdh.dll  (Unicode / -W)
#include <windows.h>

DWORD PdhGetCounterInfoW(
    PDH_HCOUNTER hCounter,
    BOOLEAN bRetrieveExplainText,
    DWORD* pdwBufferSize,
    PDH_COUNTER_INFO_W* lpBuffer   // optional
);

<DllImport("pdh.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function PdhGetCounterInfoW(
    hCounter As IntPtr,   ' PDH_HCOUNTER
    <MarshalAs(UnmanagedType.U1)> bRetrieveExplainText As Boolean,   ' BOOLEAN
    ByRef pdwBufferSize As UInteger,   ' DWORD* in/out
    lpBuffer As IntPtr   ' PDH_COUNTER_INFO_W* optional, out
) As UInteger
End Function

' hCounter : PDH_HCOUNTER
' bRetrieveExplainText : BOOLEAN
' pdwBufferSize : DWORD* in/out
' lpBuffer : PDH_COUNTER_INFO_W* optional, out
Declare PtrSafe Function PdhGetCounterInfoW Lib "pdh" ( _
    ByVal hCounter As LongPtr, _
    ByVal bRetrieveExplainText As Byte, _
    ByRef pdwBufferSize As Long, _
    ByVal lpBuffer As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

PdhGetCounterInfoW = ctypes.windll.pdh.PdhGetCounterInfoW
PdhGetCounterInfoW.restype = wintypes.DWORD
PdhGetCounterInfoW.argtypes = [
    wintypes.HANDLE,  # hCounter : PDH_HCOUNTER
    ctypes.c_byte,  # bRetrieveExplainText : BOOLEAN
    ctypes.POINTER(wintypes.DWORD),  # pdwBufferSize : DWORD* in/out
    ctypes.c_void_p,  # lpBuffer : PDH_COUNTER_INFO_W* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhGetCounterInfoW = Fiddle::Function.new(
  lib['PdhGetCounterInfoW'],
  [
    Fiddle::TYPE_VOIDP,  # hCounter : PDH_HCOUNTER
    Fiddle::TYPE_CHAR,  # bRetrieveExplainText : BOOLEAN
    Fiddle::TYPE_VOIDP,  # pdwBufferSize : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # lpBuffer : PDH_COUNTER_INFO_W* optional, out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "pdh")]
extern "system" {
    fn PdhGetCounterInfoW(
        hCounter: *mut core::ffi::c_void,  // PDH_HCOUNTER
        bRetrieveExplainText: u8,  // BOOLEAN
        pdwBufferSize: *mut u32,  // DWORD* in/out
        lpBuffer: *mut PDH_COUNTER_INFO_W  // PDH_COUNTER_INFO_W* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("pdh.dll", CharSet = CharSet.Unicode)]
public static extern uint PdhGetCounterInfoW(IntPtr hCounter, [MarshalAs(UnmanagedType.U1)] bool bRetrieveExplainText, ref uint pdwBufferSize, IntPtr lpBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhGetCounterInfoW' -Namespace Win32 -PassThru
# $api::PdhGetCounterInfoW(hCounter, bRetrieveExplainText, pdwBufferSize, lpBuffer)

#uselib "pdh.dll"
#func global PdhGetCounterInfoW "PdhGetCounterInfoW" wptr, wptr, wptr, wptr
; PdhGetCounterInfoW hCounter, bRetrieveExplainText, varptr(pdwBufferSize), varptr(lpBuffer)   ; 戻り値は stat
; hCounter : PDH_HCOUNTER -> "wptr"
; bRetrieveExplainText : BOOLEAN -> "wptr"
; pdwBufferSize : DWORD* in/out -> "wptr"
; lpBuffer : PDH_COUNTER_INFO_W* optional, out -> "wptr"
; ※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 "pdh.dll"
#cfunc global PdhGetCounterInfoW "PdhGetCounterInfoW" sptr, int, var, var
; res = PdhGetCounterInfoW(hCounter, bRetrieveExplainText, pdwBufferSize, lpBuffer)
; hCounter : PDH_HCOUNTER -> "sptr"
; bRetrieveExplainText : BOOLEAN -> "int"
; pdwBufferSize : DWORD* in/out -> "var"
; lpBuffer : PDH_COUNTER_INFO_W* optional, 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。

; DWORD PdhGetCounterInfoW(PDH_HCOUNTER hCounter, BOOLEAN bRetrieveExplainText, DWORD* pdwBufferSize, PDH_COUNTER_INFO_W* lpBuffer)
#uselib "pdh.dll"
#cfunc global PdhGetCounterInfoW "PdhGetCounterInfoW" intptr, int, var, var
; res = PdhGetCounterInfoW(hCounter, bRetrieveExplainText, pdwBufferSize, lpBuffer)
; hCounter : PDH_HCOUNTER -> "intptr"
; bRetrieveExplainText : BOOLEAN -> "int"
; pdwBufferSize : DWORD* in/out -> "var"
; lpBuffer : PDH_COUNTER_INFO_W* optional, 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 (
	pdh = windows.NewLazySystemDLL("pdh.dll")
	procPdhGetCounterInfoW = pdh.NewProc("PdhGetCounterInfoW")
)

// hCounter (PDH_HCOUNTER), bRetrieveExplainText (BOOLEAN), pdwBufferSize (DWORD* in/out), lpBuffer (PDH_COUNTER_INFO_W* optional, out)
r1, _, err := procPdhGetCounterInfoW.Call(
	uintptr(hCounter),
	uintptr(bRetrieveExplainText),
	uintptr(pdwBufferSize),
	uintptr(lpBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PdhGetCounterInfoW(
  hCounter: THandle;   // PDH_HCOUNTER
  bRetrieveExplainText: ByteBool;   // BOOLEAN
  pdwBufferSize: Pointer;   // DWORD* in/out
  lpBuffer: Pointer   // PDH_COUNTER_INFO_W* optional, out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhGetCounterInfoW';

result := DllCall("pdh\PdhGetCounterInfoW"
    , "Ptr", hCounter   ; PDH_HCOUNTER
    , "Char", bRetrieveExplainText   ; BOOLEAN
    , "Ptr", pdwBufferSize   ; DWORD* in/out
    , "Ptr", lpBuffer   ; PDH_COUNTER_INFO_W* optional, out
    , "UInt")   ; return: DWORD

●PdhGetCounterInfoW(hCounter, bRetrieveExplainText, pdwBufferSize, lpBuffer) = DLL("pdh.dll", "dword PdhGetCounterInfoW(void*, byte, void*, void*)")
# 呼び出し: PdhGetCounterInfoW(hCounter, bRetrieveExplainText, pdwBufferSize, lpBuffer)
# hCounter : PDH_HCOUNTER -> "void*"
# bRetrieveExplainText : BOOLEAN -> "byte"
# pdwBufferSize : DWORD* in/out -> "void*"
# lpBuffer : PDH_COUNTER_INFO_W* optional, 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。