PdhSelectDataSourceW

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

DWORD PdhSelectDataSourceW(
    HWND hWndOwner,
    PDH_SELECT_DATA_SOURCE_FLAGS dwFlags,
    LPWSTR szDataSource,
    DWORD* pcchBufferLength
);

<DllImport("pdh.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function PdhSelectDataSourceW(
    hWndOwner As IntPtr,   ' HWND
    dwFlags As UInteger,   ' PDH_SELECT_DATA_SOURCE_FLAGS
    <MarshalAs(UnmanagedType.LPWStr)> szDataSource As System.Text.StringBuilder,   ' LPWSTR in/out
    ByRef pcchBufferLength As UInteger   ' DWORD* in/out
) As UInteger
End Function

' hWndOwner : HWND
' dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS
' szDataSource : LPWSTR in/out
' pcchBufferLength : DWORD* in/out
Declare PtrSafe Function PdhSelectDataSourceW Lib "pdh" ( _
    ByVal hWndOwner As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal szDataSource As LongPtr, _
    ByRef pcchBufferLength 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

PdhSelectDataSourceW = ctypes.windll.pdh.PdhSelectDataSourceW
PdhSelectDataSourceW.restype = wintypes.DWORD
PdhSelectDataSourceW.argtypes = [
    wintypes.HANDLE,  # hWndOwner : HWND
    wintypes.DWORD,  # dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS
    wintypes.LPWSTR,  # szDataSource : LPWSTR in/out
    ctypes.POINTER(wintypes.DWORD),  # pcchBufferLength : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhSelectDataSourceW = Fiddle::Function.new(
  lib['PdhSelectDataSourceW'],
  [
    Fiddle::TYPE_VOIDP,  # hWndOwner : HWND
    -Fiddle::TYPE_INT,  # dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS
    Fiddle::TYPE_VOIDP,  # szDataSource : LPWSTR in/out
    Fiddle::TYPE_VOIDP,  # pcchBufferLength : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "pdh")]
extern "system" {
    fn PdhSelectDataSourceW(
        hWndOwner: *mut core::ffi::c_void,  // HWND
        dwFlags: u32,  // PDH_SELECT_DATA_SOURCE_FLAGS
        szDataSource: *mut u16,  // LPWSTR in/out
        pcchBufferLength: *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 PdhSelectDataSourceW(IntPtr hWndOwner, uint dwFlags, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szDataSource, ref uint pcchBufferLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhSelectDataSourceW' -Namespace Win32 -PassThru
# $api::PdhSelectDataSourceW(hWndOwner, dwFlags, szDataSource, pcchBufferLength)

#uselib "pdh.dll"
#func global PdhSelectDataSourceW "PdhSelectDataSourceW" wptr, wptr, wptr, wptr
; PdhSelectDataSourceW hWndOwner, dwFlags, varptr(szDataSource), varptr(pcchBufferLength)   ; 戻り値は stat
; hWndOwner : HWND -> "wptr"
; dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS -> "wptr"
; szDataSource : LPWSTR in/out -> "wptr"
; pcchBufferLength : 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 PdhSelectDataSourceW "PdhSelectDataSourceW" sptr, int, var, var
; res = PdhSelectDataSourceW(hWndOwner, dwFlags, szDataSource, pcchBufferLength)
; hWndOwner : HWND -> "sptr"
; dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS -> "int"
; szDataSource : LPWSTR in/out -> "var"
; pcchBufferLength : 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 PdhSelectDataSourceW(HWND hWndOwner, PDH_SELECT_DATA_SOURCE_FLAGS dwFlags, LPWSTR szDataSource, DWORD* pcchBufferLength)
#uselib "pdh.dll"
#cfunc global PdhSelectDataSourceW "PdhSelectDataSourceW" intptr, int, var, var
; res = PdhSelectDataSourceW(hWndOwner, dwFlags, szDataSource, pcchBufferLength)
; hWndOwner : HWND -> "intptr"
; dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS -> "int"
; szDataSource : LPWSTR in/out -> "var"
; pcchBufferLength : 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")
	procPdhSelectDataSourceW = pdh.NewProc("PdhSelectDataSourceW")
)

// hWndOwner (HWND), dwFlags (PDH_SELECT_DATA_SOURCE_FLAGS), szDataSource (LPWSTR in/out), pcchBufferLength (DWORD* in/out)
r1, _, err := procPdhSelectDataSourceW.Call(
	uintptr(hWndOwner),
	uintptr(dwFlags),
	uintptr(szDataSource),
	uintptr(pcchBufferLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function PdhSelectDataSourceW(
  hWndOwner: THandle;   // HWND
  dwFlags: DWORD;   // PDH_SELECT_DATA_SOURCE_FLAGS
  szDataSource: PWideChar;   // LPWSTR in/out
  pcchBufferLength: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhSelectDataSourceW';

result := DllCall("pdh\PdhSelectDataSourceW"
    , "Ptr", hWndOwner   ; HWND
    , "UInt", dwFlags   ; PDH_SELECT_DATA_SOURCE_FLAGS
    , "Ptr", szDataSource   ; LPWSTR in/out
    , "Ptr", pcchBufferLength   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●PdhSelectDataSourceW(hWndOwner, dwFlags, szDataSource, pcchBufferLength) = DLL("pdh.dll", "dword PdhSelectDataSourceW(void*, dword, char*, void*)")
# 呼び出し: PdhSelectDataSourceW(hWndOwner, dwFlags, szDataSource, pcchBufferLength)
# hWndOwner : HWND -> "void*"
# dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS -> "dword"
# szDataSource : LPWSTR in/out -> "char*"
# pcchBufferLength : 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。