PdhLookupPerfIndexByNameA

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

DWORD PdhLookupPerfIndexByNameA(
    LPCSTR szMachineName,   // optional
    LPCSTR szNameBuffer,
    DWORD* pdwIndex
);

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

' szMachineName : LPCSTR optional
' szNameBuffer : LPCSTR
' pdwIndex : DWORD* out
Declare PtrSafe Function PdhLookupPerfIndexByNameA Lib "pdh" ( _
    ByVal szMachineName As String, _
    ByVal szNameBuffer As String, _
    ByRef pdwIndex 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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhLookupPerfIndexByNameA = Fiddle::Function.new(
  lib['PdhLookupPerfIndexByNameA'],
  [
    Fiddle::TYPE_VOIDP,  # szMachineName : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # szNameBuffer : LPCSTR
    Fiddle::TYPE_VOIDP,  # pdwIndex : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "pdh")]
extern "system" {
    fn PdhLookupPerfIndexByNameA(
        szMachineName: *const u8,  // LPCSTR optional
        szNameBuffer: *const u8,  // LPCSTR
        pdwIndex: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "pdh.dll"
#func global PdhLookupPerfIndexByNameA "PdhLookupPerfIndexByNameA" sptr, sptr, sptr
; PdhLookupPerfIndexByNameA szMachineName, szNameBuffer, varptr(pdwIndex)   ; 戻り値は stat
; szMachineName : LPCSTR optional -> "sptr"
; szNameBuffer : LPCSTR -> "sptr"
; pdwIndex : DWORD* 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 PdhLookupPerfIndexByNameA "PdhLookupPerfIndexByNameA" str, str, var
; res = PdhLookupPerfIndexByNameA(szMachineName, szNameBuffer, pdwIndex)
; szMachineName : LPCSTR optional -> "str"
; szNameBuffer : LPCSTR -> "str"
; 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 PdhLookupPerfIndexByNameA(LPCSTR szMachineName, LPCSTR szNameBuffer, DWORD* pdwIndex)
#uselib "pdh.dll"
#cfunc global PdhLookupPerfIndexByNameA "PdhLookupPerfIndexByNameA" str, str, var
; res = PdhLookupPerfIndexByNameA(szMachineName, szNameBuffer, pdwIndex)
; szMachineName : LPCSTR optional -> "str"
; szNameBuffer : LPCSTR -> "str"
; 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")
	procPdhLookupPerfIndexByNameA = pdh.NewProc("PdhLookupPerfIndexByNameA")
)

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

function PdhLookupPerfIndexByNameA(
  szMachineName: PAnsiChar;   // LPCSTR optional
  szNameBuffer: PAnsiChar;   // LPCSTR
  pdwIndex: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhLookupPerfIndexByNameA';

result := DllCall("pdh\PdhLookupPerfIndexByNameA"
    , "AStr", szMachineName   ; LPCSTR optional
    , "AStr", szNameBuffer   ; LPCSTR
    , "Ptr", pdwIndex   ; DWORD* out
    , "UInt")   ; return: DWORD

●PdhLookupPerfIndexByNameA(szMachineName, szNameBuffer, pdwIndex) = DLL("pdh.dll", "dword PdhLookupPerfIndexByNameA(char*, char*, void*)")
# 呼び出し: PdhLookupPerfIndexByNameA(szMachineName, szNameBuffer, pdwIndex)
# szMachineName : LPCSTR optional -> "char*"
# szNameBuffer : LPCSTR -> "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)。