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RegisterClassA

関数

ウィンドウクラスを登録する(ANSI)。

DLLUSER32.dll文字セットANSI (-A)呼出規約winapiSetLastErrorあり対応OSWindows 2000 以降

シグネチャ

// USER32.dll  (ANSI / -A)
#include <windows.h>

WORD RegisterClassA(
    const WNDCLASSA* lpWndClass
);

パラメーター

名前	型	方向
lpWndClass	WNDCLASSA*	in

戻り値の型: WORD

各言語での呼び出し定義

// USER32.dll  (ANSI / -A)
#include <windows.h>

WORD RegisterClassA(
    const WNDCLASSA* lpWndClass
);

[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
static extern ushort RegisterClassA(
    IntPtr lpWndClass   // WNDCLASSA*
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function RegisterClassA(
    lpWndClass As IntPtr   ' WNDCLASSA*
) As UShort
End Function

' lpWndClass : WNDCLASSA*
Declare PtrSafe Function RegisterClassA Lib "user32" ( _
    ByVal lpWndClass As LongPtr) As Integer
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RegisterClassA = ctypes.windll.user32.RegisterClassA
RegisterClassA.restype = ctypes.c_ushort
RegisterClassA.argtypes = [
    ctypes.c_void_p,  # lpWndClass : WNDCLASSA*
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
RegisterClassA = Fiddle::Function.new(
  lib['RegisterClassA'],
  [
    Fiddle::TYPE_VOIDP,  # lpWndClass : WNDCLASSA*
  ],
  -Fiddle::TYPE_SHORT)

#[link(name = "user32")]
extern "system" {
    fn RegisterClassA(
        lpWndClass: *const WNDCLASSA  // WNDCLASSA*
    ) -> u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern ushort RegisterClassA(IntPtr lpWndClass);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_RegisterClassA' -Namespace Win32 -PassThru
# $api::RegisterClassA(lpWndClass)

#uselib "USER32.dll"
#func global RegisterClassA "RegisterClassA" sptr
; RegisterClassA varptr(lpWndClass)   ; 戻り値は stat
; lpWndClass : WNDCLASSA* -> "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 "USER32.dll"
#cfunc global RegisterClassA "RegisterClassA" var
; res = RegisterClassA(lpWndClass)
; lpWndClass : WNDCLASSA* -> "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 "USER32.dll"
#cfunc global RegisterClassA "RegisterClassA" sptr
; res = RegisterClassA(varptr(lpWndClass))
; lpWndClass : WNDCLASSA* -> "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:

; WORD RegisterClassA(WNDCLASSA* lpWndClass)
#uselib "USER32.dll"
#cfunc global RegisterClassA "RegisterClassA" var
; res = RegisterClassA(lpWndClass)
; lpWndClass : WNDCLASSA* -> "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。; WORD RegisterClassA(WNDCLASSA* lpWndClass)
#uselib "USER32.dll"
#cfunc global RegisterClassA "RegisterClassA" intptr
; res = RegisterClassA(varptr(lpWndClass))
; lpWndClass : WNDCLASSA* -> "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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procRegisterClassA = user32.NewProc("RegisterClassA")
)

// lpWndClass (WNDCLASSA*)
r1, _, err := procRegisterClassA.Call(
	uintptr(lpWndClass),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WORD

function RegisterClassA(
  lpWndClass: Pointer   // WNDCLASSA*
): Word; stdcall;
  external 'USER32.dll' name 'RegisterClassA';

result := DllCall("USER32\RegisterClassA"
    , "Ptr", lpWndClass   ; WNDCLASSA*
    , "UShort")   ; return: WORD

●RegisterClassA(lpWndClass) = DLL("USER32.dll", "int RegisterClassA(void*)")
# 呼び出し: RegisterClassA(lpWndClass)
# lpWndClass : WNDCLASSA* -> "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)。