PdhLookupPerfNameByIndexW

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

DWORD PdhLookupPerfNameByIndexW(
    LPCWSTR szMachineName,   // optional
    DWORD dwNameIndex,
    LPWSTR szNameBuffer,   // optional
    DWORD* pcchNameBufferSize
);

<DllImport("pdh.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function PdhLookupPerfNameByIndexW(
    <MarshalAs(UnmanagedType.LPWStr)> szMachineName As String,   ' LPCWSTR optional
    dwNameIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> szNameBuffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pcchNameBufferSize As UInteger   ' DWORD* in/out
) As UInteger
End Function

' szMachineName : LPCWSTR optional
' dwNameIndex : DWORD
' szNameBuffer : LPWSTR optional, out
' pcchNameBufferSize : DWORD* in/out
Declare PtrSafe Function PdhLookupPerfNameByIndexW Lib "pdh" ( _
    ByVal szMachineName As LongPtr, _
    ByVal dwNameIndex As Long, _
    ByVal szNameBuffer As LongPtr, _
    ByRef pcchNameBufferSize 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

PdhLookupPerfNameByIndexW = ctypes.windll.pdh.PdhLookupPerfNameByIndexW
PdhLookupPerfNameByIndexW.restype = wintypes.DWORD
PdhLookupPerfNameByIndexW.argtypes = [
    wintypes.LPCWSTR,  # szMachineName : LPCWSTR optional
    wintypes.DWORD,  # dwNameIndex : DWORD
    wintypes.LPWSTR,  # szNameBuffer : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchNameBufferSize : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

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

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

$sig = @"
[DllImport("pdh.dll", CharSet = CharSet.Unicode)]
public static extern uint PdhLookupPerfNameByIndexW([MarshalAs(UnmanagedType.LPWStr)] string szMachineName, uint dwNameIndex, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szNameBuffer, ref uint pcchNameBufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhLookupPerfNameByIndexW' -Namespace Win32 -PassThru
# $api::PdhLookupPerfNameByIndexW(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)

#uselib "pdh.dll"
#func global PdhLookupPerfNameByIndexW "PdhLookupPerfNameByIndexW" wptr, wptr, wptr, wptr
; PdhLookupPerfNameByIndexW szMachineName, dwNameIndex, varptr(szNameBuffer), varptr(pcchNameBufferSize)   ; 戻り値は stat
; szMachineName : LPCWSTR optional -> "wptr"
; dwNameIndex : DWORD -> "wptr"
; szNameBuffer : LPWSTR optional, out -> "wptr"
; pcchNameBufferSize : DWORD* in/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 PdhLookupPerfNameByIndexW "PdhLookupPerfNameByIndexW" wstr, int, var, var
; res = PdhLookupPerfNameByIndexW(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)
; szMachineName : LPCWSTR optional -> "wstr"
; dwNameIndex : DWORD -> "int"
; szNameBuffer : LPWSTR optional, out -> "var"
; pcchNameBufferSize : DWORD* in/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 PdhLookupPerfNameByIndexW(LPCWSTR szMachineName, DWORD dwNameIndex, LPWSTR szNameBuffer, DWORD* pcchNameBufferSize)
#uselib "pdh.dll"
#cfunc global PdhLookupPerfNameByIndexW "PdhLookupPerfNameByIndexW" wstr, int, var, var
; res = PdhLookupPerfNameByIndexW(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)
; szMachineName : LPCWSTR optional -> "wstr"
; dwNameIndex : DWORD -> "int"
; szNameBuffer : LPWSTR optional, out -> "var"
; pcchNameBufferSize : DWORD* in/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")
	procPdhLookupPerfNameByIndexW = pdh.NewProc("PdhLookupPerfNameByIndexW")
)

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

function PdhLookupPerfNameByIndexW(
  szMachineName: PWideChar;   // LPCWSTR optional
  dwNameIndex: DWORD;   // DWORD
  szNameBuffer: PWideChar;   // LPWSTR optional, out
  pcchNameBufferSize: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhLookupPerfNameByIndexW';

result := DllCall("pdh\PdhLookupPerfNameByIndexW"
    , "WStr", szMachineName   ; LPCWSTR optional
    , "UInt", dwNameIndex   ; DWORD
    , "Ptr", szNameBuffer   ; LPWSTR optional, out
    , "Ptr", pcchNameBufferSize   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●PdhLookupPerfNameByIndexW(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize) = DLL("pdh.dll", "dword PdhLookupPerfNameByIndexW(char*, dword, char*, void*)")
# 呼び出し: PdhLookupPerfNameByIndexW(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)
# szMachineName : LPCWSTR optional -> "char*"
# dwNameIndex : DWORD -> "dword"
# szNameBuffer : LPWSTR optional, out -> "char*"
# pcchNameBufferSize : DWORD* in/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。