PdhMakeCounterPathW

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

DWORD PdhMakeCounterPathW(
    PDH_COUNTER_PATH_ELEMENTS_W* pCounterPathElements,
    LPWSTR szFullPathBuffer,   // optional
    DWORD* pcchBufferSize,
    PDH_PATH_FLAGS dwFlags
);

<DllImport("pdh.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function PdhMakeCounterPathW(
    pCounterPathElements As IntPtr,   ' PDH_COUNTER_PATH_ELEMENTS_W*
    <MarshalAs(UnmanagedType.LPWStr)> szFullPathBuffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pcchBufferSize As UInteger,   ' DWORD* in/out
    dwFlags As UInteger   ' PDH_PATH_FLAGS
) As UInteger
End Function

' pCounterPathElements : PDH_COUNTER_PATH_ELEMENTS_W*
' szFullPathBuffer : LPWSTR optional, out
' pcchBufferSize : DWORD* in/out
' dwFlags : PDH_PATH_FLAGS
Declare PtrSafe Function PdhMakeCounterPathW Lib "pdh" ( _
    ByVal pCounterPathElements As LongPtr, _
    ByVal szFullPathBuffer As LongPtr, _
    ByRef pcchBufferSize As Long, _
    ByVal dwFlags As Long) 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

PdhMakeCounterPathW = ctypes.windll.pdh.PdhMakeCounterPathW
PdhMakeCounterPathW.restype = wintypes.DWORD
PdhMakeCounterPathW.argtypes = [
    ctypes.c_void_p,  # pCounterPathElements : PDH_COUNTER_PATH_ELEMENTS_W*
    wintypes.LPWSTR,  # szFullPathBuffer : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchBufferSize : DWORD* in/out
    wintypes.DWORD,  # dwFlags : PDH_PATH_FLAGS
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhMakeCounterPathW = Fiddle::Function.new(
  lib['PdhMakeCounterPathW'],
  [
    Fiddle::TYPE_VOIDP,  # pCounterPathElements : PDH_COUNTER_PATH_ELEMENTS_W*
    Fiddle::TYPE_VOIDP,  # szFullPathBuffer : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchBufferSize : DWORD* in/out
    -Fiddle::TYPE_INT,  # dwFlags : PDH_PATH_FLAGS
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "pdh")]
extern "system" {
    fn PdhMakeCounterPathW(
        pCounterPathElements: *mut PDH_COUNTER_PATH_ELEMENTS_W,  // PDH_COUNTER_PATH_ELEMENTS_W*
        szFullPathBuffer: *mut u16,  // LPWSTR optional, out
        pcchBufferSize: *mut u32,  // DWORD* in/out
        dwFlags: u32  // PDH_PATH_FLAGS
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("pdh.dll", CharSet = CharSet.Unicode)]
public static extern uint PdhMakeCounterPathW(IntPtr pCounterPathElements, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szFullPathBuffer, ref uint pcchBufferSize, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhMakeCounterPathW' -Namespace Win32 -PassThru
# $api::PdhMakeCounterPathW(pCounterPathElements, szFullPathBuffer, pcchBufferSize, dwFlags)

#uselib "pdh.dll"
#func global PdhMakeCounterPathW "PdhMakeCounterPathW" wptr, wptr, wptr, wptr
; PdhMakeCounterPathW varptr(pCounterPathElements), varptr(szFullPathBuffer), varptr(pcchBufferSize), dwFlags   ; 戻り値は stat
; pCounterPathElements : PDH_COUNTER_PATH_ELEMENTS_W* -> "wptr"
; szFullPathBuffer : LPWSTR optional, out -> "wptr"
; pcchBufferSize : DWORD* in/out -> "wptr"
; dwFlags : PDH_PATH_FLAGS -> "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 PdhMakeCounterPathW "PdhMakeCounterPathW" var, var, var, int
; res = PdhMakeCounterPathW(pCounterPathElements, szFullPathBuffer, pcchBufferSize, dwFlags)
; pCounterPathElements : PDH_COUNTER_PATH_ELEMENTS_W* -> "var"
; szFullPathBuffer : LPWSTR optional, out -> "var"
; pcchBufferSize : DWORD* in/out -> "var"
; dwFlags : PDH_PATH_FLAGS -> "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。

; DWORD PdhMakeCounterPathW(PDH_COUNTER_PATH_ELEMENTS_W* pCounterPathElements, LPWSTR szFullPathBuffer, DWORD* pcchBufferSize, PDH_PATH_FLAGS dwFlags)
#uselib "pdh.dll"
#cfunc global PdhMakeCounterPathW "PdhMakeCounterPathW" var, var, var, int
; res = PdhMakeCounterPathW(pCounterPathElements, szFullPathBuffer, pcchBufferSize, dwFlags)
; pCounterPathElements : PDH_COUNTER_PATH_ELEMENTS_W* -> "var"
; szFullPathBuffer : LPWSTR optional, out -> "var"
; pcchBufferSize : DWORD* in/out -> "var"
; dwFlags : PDH_PATH_FLAGS -> "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 (
	pdh = windows.NewLazySystemDLL("pdh.dll")
	procPdhMakeCounterPathW = pdh.NewProc("PdhMakeCounterPathW")
)

// pCounterPathElements (PDH_COUNTER_PATH_ELEMENTS_W*), szFullPathBuffer (LPWSTR optional, out), pcchBufferSize (DWORD* in/out), dwFlags (PDH_PATH_FLAGS)
r1, _, err := procPdhMakeCounterPathW.Call(
	uintptr(pCounterPathElements),
	uintptr(szFullPathBuffer),
	uintptr(pcchBufferSize),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PdhMakeCounterPathW(
  pCounterPathElements: Pointer;   // PDH_COUNTER_PATH_ELEMENTS_W*
  szFullPathBuffer: PWideChar;   // LPWSTR optional, out
  pcchBufferSize: Pointer;   // DWORD* in/out
  dwFlags: DWORD   // PDH_PATH_FLAGS
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhMakeCounterPathW';

result := DllCall("pdh\PdhMakeCounterPathW"
    , "Ptr", pCounterPathElements   ; PDH_COUNTER_PATH_ELEMENTS_W*
    , "Ptr", szFullPathBuffer   ; LPWSTR optional, out
    , "Ptr", pcchBufferSize   ; DWORD* in/out
    , "UInt", dwFlags   ; PDH_PATH_FLAGS
    , "UInt")   ; return: DWORD

●PdhMakeCounterPathW(pCounterPathElements, szFullPathBuffer, pcchBufferSize, dwFlags) = DLL("pdh.dll", "dword PdhMakeCounterPathW(void*, char*, void*, dword)")
# 呼び出し: PdhMakeCounterPathW(pCounterPathElements, szFullPathBuffer, pcchBufferSize, dwFlags)
# pCounterPathElements : PDH_COUNTER_PATH_ELEMENTS_W* -> "void*"
# szFullPathBuffer : LPWSTR optional, out -> "char*"
# pcchBufferSize : DWORD* in/out -> "void*"
# dwFlags : PDH_PATH_FLAGS -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。