WindowFromDC

関数

指定したデバイスコンテキストに対応するウィンドウハンドルを取得する。

DLLUSER32.dll呼出規約winapi対応OSWindows 2000 以降

シグネチャ

// USER32.dll
#include <windows.h>

HWND WindowFromDC(
    HDC hDC
);

パラメーター

名前	型	方向
hDC	HDC	in

戻り値の型: HWND

各言語での呼び出し定義

// USER32.dll
#include <windows.h>

HWND WindowFromDC(
    HDC hDC
);

[DllImport("USER32.dll", ExactSpelling = true)]
static extern IntPtr WindowFromDC(
    IntPtr hDC   // HDC
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function WindowFromDC(
    hDC As IntPtr   ' HDC
) As IntPtr
End Function

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

import ctypes
from ctypes import wintypes

WindowFromDC = ctypes.windll.user32.WindowFromDC
WindowFromDC.restype = ctypes.c_void_p
WindowFromDC.argtypes = [
    wintypes.HANDLE,  # hDC : HDC
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
WindowFromDC = Fiddle::Function.new(
  lib['WindowFromDC'],
  [
    Fiddle::TYPE_VOIDP,  # hDC : HDC
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn WindowFromDC(
        hDC: *mut core::ffi::c_void  // HDC
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern IntPtr WindowFromDC(IntPtr hDC);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_WindowFromDC' -Namespace Win32 -PassThru
# $api::WindowFromDC(hDC)

#uselib "USER32.dll"
#func global WindowFromDC "WindowFromDC" sptr
; WindowFromDC hDC   ; 戻り値は stat
; hDC : HDC -> "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 "USER32.dll"
#cfunc global WindowFromDC "WindowFromDC" sptr
; res = WindowFromDC(hDC)
; hDC : HDC -> "sptr"

; HWND WindowFromDC(HDC hDC)
#uselib "USER32.dll"
#cfunc global WindowFromDC "WindowFromDC" intptr
; res = WindowFromDC(hDC)
; hDC : HDC -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procWindowFromDC = user32.NewProc("WindowFromDC")
)

// hDC (HDC)
r1, _, err := procWindowFromDC.Call(
	uintptr(hDC),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HWND

function WindowFromDC(
  hDC: THandle   // HDC
): THandle; stdcall;
  external 'USER32.dll' name 'WindowFromDC';

result := DllCall("USER32\WindowFromDC"
    , "Ptr", hDC   ; HDC
    , "Ptr")   ; return: HWND

●WindowFromDC(hDC) = DLL("USER32.dll", "void* WindowFromDC(void*)")
# 呼び出し: WindowFromDC(hDC)
# hDC : HDC -> "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)。