PdhOpenQueryW

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

DWORD PdhOpenQueryW(
    LPCWSTR szDataSource,   // optional
    UINT_PTR dwUserData,
    PDH_HQUERY* phQuery
);

<DllImport("pdh.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function PdhOpenQueryW(
    <MarshalAs(UnmanagedType.LPWStr)> szDataSource As String,   ' LPCWSTR optional
    dwUserData As UIntPtr,   ' UINT_PTR
    phQuery As IntPtr   ' PDH_HQUERY* out
) As UInteger
End Function

' szDataSource : LPCWSTR optional
' dwUserData : UINT_PTR
' phQuery : PDH_HQUERY* out
Declare PtrSafe Function PdhOpenQueryW Lib "pdh" ( _
    ByVal szDataSource As LongPtr, _
    ByVal dwUserData As LongPtr, _
    ByVal phQuery As LongPtr) 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

PdhOpenQueryW = ctypes.windll.pdh.PdhOpenQueryW
PdhOpenQueryW.restype = wintypes.DWORD
PdhOpenQueryW.argtypes = [
    wintypes.LPCWSTR,  # szDataSource : LPCWSTR optional
    ctypes.c_size_t,  # dwUserData : UINT_PTR
    ctypes.c_void_p,  # phQuery : PDH_HQUERY* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhOpenQueryW = Fiddle::Function.new(
  lib['PdhOpenQueryW'],
  [
    Fiddle::TYPE_VOIDP,  # szDataSource : LPCWSTR optional
    Fiddle::TYPE_UINTPTR_T,  # dwUserData : UINT_PTR
    Fiddle::TYPE_VOIDP,  # phQuery : PDH_HQUERY* out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "pdh")]
extern "system" {
    fn PdhOpenQueryW(
        szDataSource: *const u16,  // LPCWSTR optional
        dwUserData: usize,  // UINT_PTR
        phQuery: *mut *mut core::ffi::c_void  // PDH_HQUERY* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("pdh.dll", CharSet = CharSet.Unicode)]
public static extern uint PdhOpenQueryW([MarshalAs(UnmanagedType.LPWStr)] string szDataSource, UIntPtr dwUserData, IntPtr phQuery);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhOpenQueryW' -Namespace Win32 -PassThru
# $api::PdhOpenQueryW(szDataSource, dwUserData, phQuery)

#uselib "pdh.dll"
#func global PdhOpenQueryW "PdhOpenQueryW" wptr, wptr, wptr
; PdhOpenQueryW szDataSource, dwUserData, phQuery   ; 戻り値は stat
; szDataSource : LPCWSTR optional -> "wptr"
; dwUserData : UINT_PTR -> "wptr"
; phQuery : PDH_HQUERY* 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 PdhOpenQueryW "PdhOpenQueryW" wstr, sptr, sptr
; res = PdhOpenQueryW(szDataSource, dwUserData, phQuery)
; szDataSource : LPCWSTR optional -> "wstr"
; dwUserData : UINT_PTR -> "sptr"
; phQuery : PDH_HQUERY* out -> "sptr"

; DWORD PdhOpenQueryW(LPCWSTR szDataSource, UINT_PTR dwUserData, PDH_HQUERY* phQuery)
#uselib "pdh.dll"
#cfunc global PdhOpenQueryW "PdhOpenQueryW" wstr, intptr, intptr
; res = PdhOpenQueryW(szDataSource, dwUserData, phQuery)
; szDataSource : LPCWSTR optional -> "wstr"
; dwUserData : UINT_PTR -> "intptr"
; phQuery : PDH_HQUERY* out -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	pdh = windows.NewLazySystemDLL("pdh.dll")
	procPdhOpenQueryW = pdh.NewProc("PdhOpenQueryW")
)

// szDataSource (LPCWSTR optional), dwUserData (UINT_PTR), phQuery (PDH_HQUERY* out)
r1, _, err := procPdhOpenQueryW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szDataSource))),
	uintptr(dwUserData),
	uintptr(phQuery),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PdhOpenQueryW(
  szDataSource: PWideChar;   // LPCWSTR optional
  dwUserData: NativeUInt;   // UINT_PTR
  phQuery: Pointer   // PDH_HQUERY* out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhOpenQueryW';

result := DllCall("pdh\PdhOpenQueryW"
    , "WStr", szDataSource   ; LPCWSTR optional
    , "UPtr", dwUserData   ; UINT_PTR
    , "Ptr", phQuery   ; PDH_HQUERY* out
    , "UInt")   ; return: DWORD

●PdhOpenQueryW(szDataSource, dwUserData, phQuery) = DLL("pdh.dll", "dword PdhOpenQueryW(char*, int, void*)")
# 呼び出し: PdhOpenQueryW(szDataSource, dwUserData, phQuery)
# szDataSource : LPCWSTR optional -> "char*"
# dwUserData : UINT_PTR -> "int"
# phQuery : PDH_HQUERY* 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。