PdhLookupPerfIndexByNameW

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

DWORD PdhLookupPerfIndexByNameW(
    LPCWSTR szMachineName,   // optional
    LPCWSTR szNameBuffer,
    DWORD* pdwIndex
);

<DllImport("pdh.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function PdhLookupPerfIndexByNameW(
    <MarshalAs(UnmanagedType.LPWStr)> szMachineName As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> szNameBuffer As String,   ' LPCWSTR
    <Out> ByRef pdwIndex As UInteger   ' DWORD* out
) As UInteger
End Function

' szMachineName : LPCWSTR optional
' szNameBuffer : LPCWSTR
' pdwIndex : DWORD* out
Declare PtrSafe Function PdhLookupPerfIndexByNameW Lib "pdh" ( _
    ByVal szMachineName As LongPtr, _
    ByVal szNameBuffer As LongPtr, _
    ByRef pdwIndex 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

PdhLookupPerfIndexByNameW = ctypes.windll.pdh.PdhLookupPerfIndexByNameW
PdhLookupPerfIndexByNameW.restype = wintypes.DWORD
PdhLookupPerfIndexByNameW.argtypes = [
    wintypes.LPCWSTR,  # szMachineName : LPCWSTR optional
    wintypes.LPCWSTR,  # szNameBuffer : LPCWSTR
    ctypes.POINTER(wintypes.DWORD),  # pdwIndex : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhLookupPerfIndexByNameW = Fiddle::Function.new(
  lib['PdhLookupPerfIndexByNameW'],
  [
    Fiddle::TYPE_VOIDP,  # szMachineName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # szNameBuffer : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pdwIndex : DWORD* out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "pdh")]
extern "system" {
    fn PdhLookupPerfIndexByNameW(
        szMachineName: *const u16,  // LPCWSTR optional
        szNameBuffer: *const u16,  // LPCWSTR
        pdwIndex: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("pdh.dll", CharSet = CharSet.Unicode)]
public static extern uint PdhLookupPerfIndexByNameW([MarshalAs(UnmanagedType.LPWStr)] string szMachineName, [MarshalAs(UnmanagedType.LPWStr)] string szNameBuffer, out uint pdwIndex);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhLookupPerfIndexByNameW' -Namespace Win32 -PassThru
# $api::PdhLookupPerfIndexByNameW(szMachineName, szNameBuffer, pdwIndex)

#uselib "pdh.dll"
#func global PdhLookupPerfIndexByNameW "PdhLookupPerfIndexByNameW" wptr, wptr, wptr
; PdhLookupPerfIndexByNameW szMachineName, szNameBuffer, varptr(pdwIndex)   ; 戻り値は stat
; szMachineName : LPCWSTR optional -> "wptr"
; szNameBuffer : LPCWSTR -> "wptr"
; pdwIndex : DWORD* 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 PdhLookupPerfIndexByNameW "PdhLookupPerfIndexByNameW" wstr, wstr, var
; res = PdhLookupPerfIndexByNameW(szMachineName, szNameBuffer, pdwIndex)
; szMachineName : LPCWSTR optional -> "wstr"
; szNameBuffer : LPCWSTR -> "wstr"
; pdwIndex : 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。

; DWORD PdhLookupPerfIndexByNameW(LPCWSTR szMachineName, LPCWSTR szNameBuffer, DWORD* pdwIndex)
#uselib "pdh.dll"
#cfunc global PdhLookupPerfIndexByNameW "PdhLookupPerfIndexByNameW" wstr, wstr, var
; res = PdhLookupPerfIndexByNameW(szMachineName, szNameBuffer, pdwIndex)
; szMachineName : LPCWSTR optional -> "wstr"
; szNameBuffer : LPCWSTR -> "wstr"
; pdwIndex : 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 (
	pdh = windows.NewLazySystemDLL("pdh.dll")
	procPdhLookupPerfIndexByNameW = pdh.NewProc("PdhLookupPerfIndexByNameW")
)

// szMachineName (LPCWSTR optional), szNameBuffer (LPCWSTR), pdwIndex (DWORD* out)
r1, _, err := procPdhLookupPerfIndexByNameW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szMachineName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szNameBuffer))),
	uintptr(pdwIndex),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PdhLookupPerfIndexByNameW(
  szMachineName: PWideChar;   // LPCWSTR optional
  szNameBuffer: PWideChar;   // LPCWSTR
  pdwIndex: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhLookupPerfIndexByNameW';

result := DllCall("pdh\PdhLookupPerfIndexByNameW"
    , "WStr", szMachineName   ; LPCWSTR optional
    , "WStr", szNameBuffer   ; LPCWSTR
    , "Ptr", pdwIndex   ; DWORD* out
    , "UInt")   ; return: DWORD

●PdhLookupPerfIndexByNameW(szMachineName, szNameBuffer, pdwIndex) = DLL("pdh.dll", "dword PdhLookupPerfIndexByNameW(char*, char*, void*)")
# 呼び出し: PdhLookupPerfIndexByNameW(szMachineName, szNameBuffer, pdwIndex)
# szMachineName : LPCWSTR optional -> "char*"
# szNameBuffer : LPCWSTR -> "char*"
# pdwIndex : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。