ホーム › System.Performance › PdhGetDefaultPerfCounterA

PdhGetDefaultPerfCounterA

関数

オブジェクトの既定カウンター名を取得する(ANSI版)。

DLLpdh.dll文字セットANSI (-A)呼出規約winapi対応OSWindows XP 以降

シグネチャ

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

DWORD PdhGetDefaultPerfCounterA(
    LPCSTR szDataSource,   // optional
    LPCSTR szMachineName,   // optional
    LPCSTR szObjectName,
    LPSTR szDefaultCounterName,   // optional
    DWORD* pcchBufferSize
);

パラメーター

名前	型	方向
szDataSource	LPCSTR	inoptional
szMachineName	LPCSTR	inoptional
szObjectName	LPCSTR	in
szDefaultCounterName	LPSTR	outoptional
pcchBufferSize	DWORD*	inout

戻り値の型: DWORD

各言語での呼び出し定義

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

DWORD PdhGetDefaultPerfCounterA(
    LPCSTR szDataSource,   // optional
    LPCSTR szMachineName,   // optional
    LPCSTR szObjectName,
    LPSTR szDefaultCounterName,   // optional
    DWORD* pcchBufferSize
);

[DllImport("pdh.dll", CharSet = CharSet.Ansi, ExactSpelling = true)]
static extern uint PdhGetDefaultPerfCounterA(
    [MarshalAs(UnmanagedType.LPStr)] string szDataSource,   // LPCSTR optional
    [MarshalAs(UnmanagedType.LPStr)] string szMachineName,   // LPCSTR optional
    [MarshalAs(UnmanagedType.LPStr)] string szObjectName,   // LPCSTR
    [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder szDefaultCounterName,   // LPSTR optional, out
    ref uint pcchBufferSize   // DWORD* in/out
);

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

' szDataSource : LPCSTR optional
' szMachineName : LPCSTR optional
' szObjectName : LPCSTR
' szDefaultCounterName : LPSTR optional, out
' pcchBufferSize : DWORD* in/out
Declare PtrSafe Function PdhGetDefaultPerfCounterA Lib "pdh" ( _
    ByVal szDataSource As String, _
    ByVal szMachineName As String, _
    ByVal szObjectName As String, _
    ByVal szDefaultCounterName 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

PdhGetDefaultPerfCounterA = ctypes.windll.pdh.PdhGetDefaultPerfCounterA
PdhGetDefaultPerfCounterA.restype = wintypes.DWORD
PdhGetDefaultPerfCounterA.argtypes = [
    wintypes.LPCSTR,  # szDataSource : LPCSTR optional
    wintypes.LPCSTR,  # szMachineName : LPCSTR optional
    wintypes.LPCSTR,  # szObjectName : LPCSTR
    wintypes.LPSTR,  # szDefaultCounterName : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchBufferSize : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('pdh.dll')
PdhGetDefaultPerfCounterA = Fiddle::Function.new(
  lib['PdhGetDefaultPerfCounterA'],
  [
    Fiddle::TYPE_VOIDP,  # szDataSource : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # szMachineName : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # szObjectName : LPCSTR
    Fiddle::TYPE_VOIDP,  # szDefaultCounterName : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchBufferSize : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "pdh")]
extern "system" {
    fn PdhGetDefaultPerfCounterA(
        szDataSource: *const u8,  // LPCSTR optional
        szMachineName: *const u8,  // LPCSTR optional
        szObjectName: *const u8,  // LPCSTR
        szDefaultCounterName: *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 PdhGetDefaultPerfCounterA([MarshalAs(UnmanagedType.LPStr)] string szDataSource, [MarshalAs(UnmanagedType.LPStr)] string szMachineName, [MarshalAs(UnmanagedType.LPStr)] string szObjectName, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder szDefaultCounterName, ref uint pcchBufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'pdh_PdhGetDefaultPerfCounterA' -Namespace Win32 -PassThru
# $api::PdhGetDefaultPerfCounterA(szDataSource, szMachineName, szObjectName, szDefaultCounterName, pcchBufferSize)

#uselib "pdh.dll"
#func global PdhGetDefaultPerfCounterA "PdhGetDefaultPerfCounterA" sptr, sptr, sptr, sptr, sptr
; PdhGetDefaultPerfCounterA szDataSource, szMachineName, szObjectName, varptr(szDefaultCounterName), varptr(pcchBufferSize)   ; 戻り値は stat
; szDataSource : LPCSTR optional -> "sptr"
; szMachineName : LPCSTR optional -> "sptr"
; szObjectName : LPCSTR -> "sptr"
; szDefaultCounterName : 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。

出力引数:

#uselib "pdh.dll"
#cfunc global PdhGetDefaultPerfCounterA "PdhGetDefaultPerfCounterA" str, str, str, var, var
; res = PdhGetDefaultPerfCounterA(szDataSource, szMachineName, szObjectName, szDefaultCounterName, pcchBufferSize)
; szDataSource : LPCSTR optional -> "str"
; szMachineName : LPCSTR optional -> "str"
; szObjectName : LPCSTR -> "str"
; szDefaultCounterName : 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。#uselib "pdh.dll"
#cfunc global PdhGetDefaultPerfCounterA "PdhGetDefaultPerfCounterA" str, str, str, sptr, sptr
; res = PdhGetDefaultPerfCounterA(szDataSource, szMachineName, szObjectName, varptr(szDefaultCounterName), varptr(pcchBufferSize))
; szDataSource : LPCSTR optional -> "str"
; szMachineName : LPCSTR optional -> "str"
; szObjectName : LPCSTR -> "str"
; szDefaultCounterName : LPSTR optional, out -> "sptr"
; pcchBufferSize : DWORD* in/out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; DWORD PdhGetDefaultPerfCounterA(LPCSTR szDataSource, LPCSTR szMachineName, LPCSTR szObjectName, LPSTR szDefaultCounterName, DWORD* pcchBufferSize)
#uselib "pdh.dll"
#cfunc global PdhGetDefaultPerfCounterA "PdhGetDefaultPerfCounterA" str, str, str, var, var
; res = PdhGetDefaultPerfCounterA(szDataSource, szMachineName, szObjectName, szDefaultCounterName, pcchBufferSize)
; szDataSource : LPCSTR optional -> "str"
; szMachineName : LPCSTR optional -> "str"
; szObjectName : LPCSTR -> "str"
; szDefaultCounterName : 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 PdhGetDefaultPerfCounterA(LPCSTR szDataSource, LPCSTR szMachineName, LPCSTR szObjectName, LPSTR szDefaultCounterName, DWORD* pcchBufferSize)
#uselib "pdh.dll"
#cfunc global PdhGetDefaultPerfCounterA "PdhGetDefaultPerfCounterA" str, str, str, intptr, intptr
; res = PdhGetDefaultPerfCounterA(szDataSource, szMachineName, szObjectName, varptr(szDefaultCounterName), varptr(pcchBufferSize))
; szDataSource : LPCSTR optional -> "str"
; szMachineName : LPCSTR optional -> "str"
; szObjectName : LPCSTR -> "str"
; szDefaultCounterName : LPSTR optional, out -> "intptr"
; pcchBufferSize : DWORD* in/out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	pdh = windows.NewLazySystemDLL("pdh.dll")
	procPdhGetDefaultPerfCounterA = pdh.NewProc("PdhGetDefaultPerfCounterA")
)

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

function PdhGetDefaultPerfCounterA(
  szDataSource: PAnsiChar;   // LPCSTR optional
  szMachineName: PAnsiChar;   // LPCSTR optional
  szObjectName: PAnsiChar;   // LPCSTR
  szDefaultCounterName: PAnsiChar;   // LPSTR optional, out
  pcchBufferSize: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'pdh.dll' name 'PdhGetDefaultPerfCounterA';

result := DllCall("pdh\PdhGetDefaultPerfCounterA"
    , "AStr", szDataSource   ; LPCSTR optional
    , "AStr", szMachineName   ; LPCSTR optional
    , "AStr", szObjectName   ; LPCSTR
    , "Ptr", szDefaultCounterName   ; LPSTR optional, out
    , "Ptr", pcchBufferSize   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●PdhGetDefaultPerfCounterA(szDataSource, szMachineName, szObjectName, szDefaultCounterName, pcchBufferSize) = DLL("pdh.dll", "dword PdhGetDefaultPerfCounterA(char*, char*, char*, char*, void*)")
# 呼び出し: PdhGetDefaultPerfCounterA(szDataSource, szMachineName, szObjectName, szDefaultCounterName, pcchBufferSize)
# szDataSource : LPCSTR optional -> "char*"
# szMachineName : LPCSTR optional -> "char*"
# szObjectName : LPCSTR -> "char*"
# szDefaultCounterName : 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)。