PdhSelectDataSourceA

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

DWORD PdhSelectDataSourceA(
    HWND hWndOwner,
    PDH_SELECT_DATA_SOURCE_FLAGS dwFlags,
    LPSTR szDataSource,
    DWORD* pcchBufferLength
);

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

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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhSelectDataSourceA = Fiddle::Function.new(
  lib['PdhSelectDataSourceA'],
  [
    Fiddle::TYPE_VOIDP,  # hWndOwner : HWND
    -Fiddle::TYPE_INT,  # dwFlags : PDH_SELECT_DATA_SOURCE_FLAGS
    Fiddle::TYPE_VOIDP,  # szDataSource : LPSTR in/out
    Fiddle::TYPE_VOIDP,  # pcchBufferLength : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "pdh")]
extern "system" {
    fn PdhSelectDataSourceA(
        hWndOwner: *mut core::ffi::c_void,  // HWND
        dwFlags: u32,  // PDH_SELECT_DATA_SOURCE_FLAGS
        szDataSource: *mut u8,  // LPSTR 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.Ansi)]
public static extern uint PdhSelectDataSourceA(IntPtr hWndOwner, uint dwFlags, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder szDataSource, ref uint pcchBufferLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhSelectDataSourceA' -Namespace Win32 -PassThru
# $api::PdhSelectDataSourceA(hWndOwner, dwFlags, szDataSource, pcchBufferLength)

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

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

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

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

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