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GetMaximumProcessorCount

関数

指定グループまたは全体の最大プロセッサ数を取得する。

DLLKERNEL32.dll呼出規約winapiSetLastErrorあり対応OSWindows 7 以降

シグネチャ

// KERNEL32.dll
#include <windows.h>

DWORD GetMaximumProcessorCount(
    WORD GroupNumber
);

パラメーター

名前	型	方向
GroupNumber	WORD	in

戻り値の型: DWORD

各言語での呼び出し定義

// KERNEL32.dll
#include <windows.h>

DWORD GetMaximumProcessorCount(
    WORD GroupNumber
);

[DllImport("KERNEL32.dll", SetLastError = true, ExactSpelling = true)]
static extern uint GetMaximumProcessorCount(
    ushort GroupNumber   // WORD
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetMaximumProcessorCount(
    GroupNumber As UShort   ' WORD
) As UInteger
End Function

' GroupNumber : WORD
Declare PtrSafe Function GetMaximumProcessorCount Lib "kernel32" ( _
    ByVal GroupNumber As Integer) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetMaximumProcessorCount = ctypes.windll.kernel32.GetMaximumProcessorCount
GetMaximumProcessorCount.restype = wintypes.DWORD
GetMaximumProcessorCount.argtypes = [
    ctypes.c_ushort,  # GroupNumber : WORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetMaximumProcessorCount = Fiddle::Function.new(
  lib['GetMaximumProcessorCount'],
  [
    -Fiddle::TYPE_SHORT,  # GroupNumber : WORD
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetMaximumProcessorCount(
        GroupNumber: u16  // WORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern uint GetMaximumProcessorCount(ushort GroupNumber);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetMaximumProcessorCount' -Namespace Win32 -PassThru
# $api::GetMaximumProcessorCount(GroupNumber)

#uselib "KERNEL32.dll"
#func global GetMaximumProcessorCount "GetMaximumProcessorCount" sptr
; GetMaximumProcessorCount GroupNumber   ; 戻り値は stat
; GroupNumber : WORD -> "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 "KERNEL32.dll"
#cfunc global GetMaximumProcessorCount "GetMaximumProcessorCount" int
; res = GetMaximumProcessorCount(GroupNumber)
; GroupNumber : WORD -> "int"

; DWORD GetMaximumProcessorCount(WORD GroupNumber)
#uselib "KERNEL32.dll"
#cfunc global GetMaximumProcessorCount "GetMaximumProcessorCount" int
; res = GetMaximumProcessorCount(GroupNumber)
; GroupNumber : WORD -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetMaximumProcessorCount = kernel32.NewProc("GetMaximumProcessorCount")
)

// GroupNumber (WORD)
r1, _, err := procGetMaximumProcessorCount.Call(
	uintptr(GroupNumber),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetMaximumProcessorCount(
  GroupNumber: Word   // WORD
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetMaximumProcessorCount';

result := DllCall("KERNEL32\GetMaximumProcessorCount"
    , "UShort", GroupNumber   ; WORD
    , "UInt")   ; return: DWORD

●GetMaximumProcessorCount(GroupNumber) = DLL("KERNEL32.dll", "dword GetMaximumProcessorCount(int)")
# 呼び出し: GetMaximumProcessorCount(GroupNumber)
# GroupNumber : WORD -> "int"
# 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)。