PdhGetDefaultPerfObjectHA

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

DWORD PdhGetDefaultPerfObjectHA(
    PDH_HLOG hDataSource,   // optional
    LPCSTR szMachineName,   // optional
    LPSTR szDefaultObjectName,   // optional
    DWORD* pcchBufferSize
);

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

' hDataSource : PDH_HLOG optional
' szMachineName : LPCSTR optional
' szDefaultObjectName : LPSTR optional, out
' pcchBufferSize : DWORD* in/out
Declare PtrSafe Function PdhGetDefaultPerfObjectHA Lib "pdh" ( _
    ByVal hDataSource As LongPtr, _
    ByVal szMachineName As String, _
    ByVal szDefaultObjectName As String, _
    ByRef pcchBufferSize 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

PdhGetDefaultPerfObjectHA = ctypes.windll.pdh.PdhGetDefaultPerfObjectHA
PdhGetDefaultPerfObjectHA.restype = wintypes.DWORD
PdhGetDefaultPerfObjectHA.argtypes = [
    wintypes.HANDLE,  # hDataSource : PDH_HLOG optional
    wintypes.LPCSTR,  # szMachineName : LPCSTR optional
    wintypes.LPSTR,  # szDefaultObjectName : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchBufferSize : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhGetDefaultPerfObjectHA = Fiddle::Function.new(
  lib['PdhGetDefaultPerfObjectHA'],
  [
    Fiddle::TYPE_VOIDP,  # hDataSource : PDH_HLOG optional
    Fiddle::TYPE_VOIDP,  # szMachineName : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # szDefaultObjectName : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchBufferSize : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "pdh")]
extern "system" {
    fn PdhGetDefaultPerfObjectHA(
        hDataSource: *mut core::ffi::c_void,  // PDH_HLOG optional
        szMachineName: *const u8,  // LPCSTR optional
        szDefaultObjectName: *mut u8,  // LPSTR optional, out
        pcchBufferSize: *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 PdhGetDefaultPerfObjectHA(IntPtr hDataSource, [MarshalAs(UnmanagedType.LPStr)] string szMachineName, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder szDefaultObjectName, ref uint pcchBufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhGetDefaultPerfObjectHA' -Namespace Win32 -PassThru
# $api::PdhGetDefaultPerfObjectHA(hDataSource, szMachineName, szDefaultObjectName, pcchBufferSize)

#uselib "pdh.dll"
#func global PdhGetDefaultPerfObjectHA "PdhGetDefaultPerfObjectHA" sptr, sptr, sptr, sptr
; PdhGetDefaultPerfObjectHA hDataSource, szMachineName, varptr(szDefaultObjectName), varptr(pcchBufferSize)   ; 戻り値は stat
; hDataSource : PDH_HLOG optional -> "sptr"
; szMachineName : LPCSTR optional -> "sptr"
; szDefaultObjectName : LPSTR optional, out -> "sptr"
; pcchBufferSize : 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 PdhGetDefaultPerfObjectHA "PdhGetDefaultPerfObjectHA" sptr, str, var, var
; res = PdhGetDefaultPerfObjectHA(hDataSource, szMachineName, szDefaultObjectName, pcchBufferSize)
; hDataSource : PDH_HLOG optional -> "sptr"
; szMachineName : LPCSTR optional -> "str"
; szDefaultObjectName : LPSTR optional, out -> "var"
; pcchBufferSize : 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 PdhGetDefaultPerfObjectHA(PDH_HLOG hDataSource, LPCSTR szMachineName, LPSTR szDefaultObjectName, DWORD* pcchBufferSize)
#uselib "pdh.dll"
#cfunc global PdhGetDefaultPerfObjectHA "PdhGetDefaultPerfObjectHA" intptr, str, var, var
; res = PdhGetDefaultPerfObjectHA(hDataSource, szMachineName, szDefaultObjectName, pcchBufferSize)
; hDataSource : PDH_HLOG optional -> "intptr"
; szMachineName : LPCSTR optional -> "str"
; szDefaultObjectName : LPSTR optional, out -> "var"
; pcchBufferSize : 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")
	procPdhGetDefaultPerfObjectHA = pdh.NewProc("PdhGetDefaultPerfObjectHA")
)

// hDataSource (PDH_HLOG optional), szMachineName (LPCSTR optional), szDefaultObjectName (LPSTR optional, out), pcchBufferSize (DWORD* in/out)
r1, _, err := procPdhGetDefaultPerfObjectHA.Call(
	uintptr(hDataSource),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szMachineName))),
	uintptr(szDefaultObjectName),
	uintptr(pcchBufferSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PdhGetDefaultPerfObjectHA(
  hDataSource: THandle;   // PDH_HLOG optional
  szMachineName: PAnsiChar;   // LPCSTR optional
  szDefaultObjectName: PAnsiChar;   // LPSTR optional, out
  pcchBufferSize: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhGetDefaultPerfObjectHA';

result := DllCall("pdh\PdhGetDefaultPerfObjectHA"
    , "Ptr", hDataSource   ; PDH_HLOG optional
    , "AStr", szMachineName   ; LPCSTR optional
    , "Ptr", szDefaultObjectName   ; LPSTR optional, out
    , "Ptr", pcchBufferSize   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●PdhGetDefaultPerfObjectHA(hDataSource, szMachineName, szDefaultObjectName, pcchBufferSize) = DLL("pdh.dll", "dword PdhGetDefaultPerfObjectHA(void*, char*, char*, void*)")
# 呼び出し: PdhGetDefaultPerfObjectHA(hDataSource, szMachineName, szDefaultObjectName, pcchBufferSize)
# hDataSource : PDH_HLOG optional -> "void*"
# szMachineName : LPCSTR optional -> "char*"
# szDefaultObjectName : LPSTR optional, out -> "char*"
# pcchBufferSize : 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)。