PdhLookupPerfNameByIndexA

// pdh.dll  (ANSI / -A)
#include <windows.h>

DWORD PdhLookupPerfNameByIndexA(
    LPCSTR szMachineName,   // optional
    DWORD dwNameIndex,
    LPSTR szNameBuffer,   // optional
    DWORD* pcchNameBufferSize
);

<DllImport("pdh.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function PdhLookupPerfNameByIndexA(
    <MarshalAs(UnmanagedType.LPStr)> szMachineName As String,   ' LPCSTR optional
    dwNameIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> szNameBuffer As System.Text.StringBuilder,   ' LPSTR optional, out
    ByRef pcchNameBufferSize As UInteger   ' DWORD* in/out
) As UInteger
End Function

' szMachineName : LPCSTR optional
' dwNameIndex : DWORD
' szNameBuffer : LPSTR optional, out
' pcchNameBufferSize : DWORD* in/out
Declare PtrSafe Function PdhLookupPerfNameByIndexA Lib "pdh" ( _
    ByVal szMachineName As String, _
    ByVal dwNameIndex As Long, _
    ByVal szNameBuffer As String, _
    ByRef pcchNameBufferSize 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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhLookupPerfNameByIndexA = Fiddle::Function.new(
  lib['PdhLookupPerfNameByIndexA'],
  [
    Fiddle::TYPE_VOIDP,  # szMachineName : LPCSTR optional
    -Fiddle::TYPE_INT,  # dwNameIndex : DWORD
    Fiddle::TYPE_VOIDP,  # szNameBuffer : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchNameBufferSize : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "pdh")]
extern "system" {
    fn PdhLookupPerfNameByIndexA(
        szMachineName: *const u8,  // LPCSTR optional
        dwNameIndex: u32,  // DWORD
        szNameBuffer: *mut u8,  // LPSTR 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.Ansi)]
public static extern uint PdhLookupPerfNameByIndexA([MarshalAs(UnmanagedType.LPStr)] string szMachineName, uint dwNameIndex, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder szNameBuffer, ref uint pcchNameBufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhLookupPerfNameByIndexA' -Namespace Win32 -PassThru
# $api::PdhLookupPerfNameByIndexA(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)

#uselib "pdh.dll"
#func global PdhLookupPerfNameByIndexA "PdhLookupPerfNameByIndexA" sptr, sptr, sptr, sptr
; PdhLookupPerfNameByIndexA szMachineName, dwNameIndex, varptr(szNameBuffer), varptr(pcchNameBufferSize)   ; 戻り値は stat
; szMachineName : LPCSTR optional -> "sptr"
; dwNameIndex : DWORD -> "sptr"
; szNameBuffer : LPSTR optional, out -> "sptr"
; pcchNameBufferSize : DWORD* in/out -> "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 "pdh.dll"
#cfunc global PdhLookupPerfNameByIndexA "PdhLookupPerfNameByIndexA" str, int, var, var
; res = PdhLookupPerfNameByIndexA(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)
; szMachineName : LPCSTR optional -> "str"
; dwNameIndex : DWORD -> "int"
; szNameBuffer : LPSTR 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 PdhLookupPerfNameByIndexA(LPCSTR szMachineName, DWORD dwNameIndex, LPSTR szNameBuffer, DWORD* pcchNameBufferSize)
#uselib "pdh.dll"
#cfunc global PdhLookupPerfNameByIndexA "PdhLookupPerfNameByIndexA" str, int, var, var
; res = PdhLookupPerfNameByIndexA(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)
; szMachineName : LPCSTR optional -> "str"
; dwNameIndex : DWORD -> "int"
; szNameBuffer : LPSTR 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")
	procPdhLookupPerfNameByIndexA = pdh.NewProc("PdhLookupPerfNameByIndexA")
)

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

function PdhLookupPerfNameByIndexA(
  szMachineName: PAnsiChar;   // LPCSTR optional
  dwNameIndex: DWORD;   // DWORD
  szNameBuffer: PAnsiChar;   // LPSTR optional, out
  pcchNameBufferSize: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhLookupPerfNameByIndexA';

result := DllCall("pdh\PdhLookupPerfNameByIndexA"
    , "AStr", szMachineName   ; LPCSTR optional
    , "UInt", dwNameIndex   ; DWORD
    , "Ptr", szNameBuffer   ; LPSTR optional, out
    , "Ptr", pcchNameBufferSize   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●PdhLookupPerfNameByIndexA(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize) = DLL("pdh.dll", "dword PdhLookupPerfNameByIndexA(char*, dword, char*, void*)")
# 呼び出し: PdhLookupPerfNameByIndexA(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize)
# szMachineName : LPCSTR optional -> "char*"
# dwNameIndex : DWORD -> "dword"
# szNameBuffer : LPSTR 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)。