PdhEnumMachinesW

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

DWORD PdhEnumMachinesW(
    LPCWSTR szDataSource,   // optional
    LPWSTR mszMachineList,   // optional
    DWORD* pcchBufferSize
);

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

' szDataSource : LPCWSTR optional
' mszMachineList : LPWSTR optional, out
' pcchBufferSize : DWORD* in/out
Declare PtrSafe Function PdhEnumMachinesW Lib "pdh" ( _
    ByVal szDataSource As LongPtr, _
    ByVal mszMachineList As LongPtr, _
    ByRef pcchBufferSize 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

PdhEnumMachinesW = ctypes.windll.pdh.PdhEnumMachinesW
PdhEnumMachinesW.restype = wintypes.DWORD
PdhEnumMachinesW.argtypes = [
    wintypes.LPCWSTR,  # szDataSource : LPCWSTR optional
    wintypes.LPWSTR,  # mszMachineList : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchBufferSize : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

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

#[link(name = "pdh")]
extern "system" {
    fn PdhEnumMachinesW(
        szDataSource: *const u16,  // LPCWSTR optional
        mszMachineList: *mut u16,  // LPWSTR 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.Unicode)]
public static extern uint PdhEnumMachinesW([MarshalAs(UnmanagedType.LPWStr)] string szDataSource, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder mszMachineList, ref uint pcchBufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhEnumMachinesW' -Namespace Win32 -PassThru
# $api::PdhEnumMachinesW(szDataSource, mszMachineList, pcchBufferSize)

#uselib "pdh.dll"
#func global PdhEnumMachinesW "PdhEnumMachinesW" wptr, wptr, wptr
; PdhEnumMachinesW szDataSource, varptr(mszMachineList), varptr(pcchBufferSize)   ; 戻り値は stat
; szDataSource : LPCWSTR optional -> "wptr"
; mszMachineList : LPWSTR optional, out -> "wptr"
; pcchBufferSize : 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 PdhEnumMachinesW "PdhEnumMachinesW" wstr, var, var
; res = PdhEnumMachinesW(szDataSource, mszMachineList, pcchBufferSize)
; szDataSource : LPCWSTR optional -> "wstr"
; mszMachineList : LPWSTR 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 PdhEnumMachinesW(LPCWSTR szDataSource, LPWSTR mszMachineList, DWORD* pcchBufferSize)
#uselib "pdh.dll"
#cfunc global PdhEnumMachinesW "PdhEnumMachinesW" wstr, var, var
; res = PdhEnumMachinesW(szDataSource, mszMachineList, pcchBufferSize)
; szDataSource : LPCWSTR optional -> "wstr"
; mszMachineList : LPWSTR 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")
	procPdhEnumMachinesW = pdh.NewProc("PdhEnumMachinesW")
)

// szDataSource (LPCWSTR optional), mszMachineList (LPWSTR optional, out), pcchBufferSize (DWORD* in/out)
r1, _, err := procPdhEnumMachinesW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szDataSource))),
	uintptr(mszMachineList),
	uintptr(pcchBufferSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PdhEnumMachinesW(
  szDataSource: PWideChar;   // LPCWSTR optional
  mszMachineList: PWideChar;   // LPWSTR optional, out
  pcchBufferSize: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhEnumMachinesW';

result := DllCall("pdh\PdhEnumMachinesW"
    , "WStr", szDataSource   ; LPCWSTR optional
    , "Ptr", mszMachineList   ; LPWSTR optional, out
    , "Ptr", pcchBufferSize   ; DWORD* in/out
    , "UInt")   ; return: DWORD

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