GdipReleaseDC

関数

Graphicsから取得したデバイスコンテキストを解放する。

DLLgdiplus.dll呼出規約winapi

シグネチャ

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

Status GdipReleaseDC(
    GpGraphics* graphics,
    HDC hdc
);

パラメーター

名前	型	方向
graphics	GpGraphics*	inout
hdc	HDC	in

戻り値の型: Status

各言語での呼び出し定義

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

Status GdipReleaseDC(
    GpGraphics* graphics,
    HDC hdc
);

[DllImport("gdiplus.dll", ExactSpelling = true)]
static extern int GdipReleaseDC(
    IntPtr graphics,   // GpGraphics* in/out
    IntPtr hdc   // HDC
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipReleaseDC(
    graphics As IntPtr,   ' GpGraphics* in/out
    hdc As IntPtr   ' HDC
) As Integer
End Function

' graphics : GpGraphics* in/out
' hdc : HDC
Declare PtrSafe Function GdipReleaseDC Lib "gdiplus" ( _
    ByVal graphics As LongPtr, _
    ByVal hdc As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GdipReleaseDC = ctypes.windll.gdiplus.GdipReleaseDC
GdipReleaseDC.restype = ctypes.c_int
GdipReleaseDC.argtypes = [
    ctypes.c_void_p,  # graphics : GpGraphics* in/out
    wintypes.HANDLE,  # hdc : HDC
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipReleaseDC = Fiddle::Function.new(
  lib['GdipReleaseDC'],
  [
    Fiddle::TYPE_VOIDP,  # graphics : GpGraphics* in/out
    Fiddle::TYPE_VOIDP,  # hdc : HDC
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipReleaseDC(
        graphics: *mut GpGraphics,  // GpGraphics* in/out
        hdc: *mut core::ffi::c_void  // HDC
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipReleaseDC(IntPtr graphics, IntPtr hdc);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipReleaseDC' -Namespace Win32 -PassThru
# $api::GdipReleaseDC(graphics, hdc)

#uselib "gdiplus.dll"
#func global GdipReleaseDC "GdipReleaseDC" sptr, sptr
; GdipReleaseDC varptr(graphics), hdc   ; 戻り値は stat
; graphics : GpGraphics* in/out -> "sptr"
; 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。

出力引数:

#uselib "gdiplus.dll"
#cfunc global GdipReleaseDC "GdipReleaseDC" var, sptr
; res = GdipReleaseDC(graphics, hdc)
; graphics : GpGraphics* in/out -> "var"
; hdc : HDC -> "sptr"
; ※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 "gdiplus.dll"
#cfunc global GdipReleaseDC "GdipReleaseDC" sptr, sptr
; res = GdipReleaseDC(varptr(graphics), hdc)
; graphics : GpGraphics* in/out -> "sptr"
; hdc : HDC -> "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:

; Status GdipReleaseDC(GpGraphics* graphics, HDC hdc)
#uselib "gdiplus.dll"
#cfunc global GdipReleaseDC "GdipReleaseDC" var, intptr
; res = GdipReleaseDC(graphics, hdc)
; graphics : GpGraphics* in/out -> "var"
; hdc : HDC -> "intptr"
; ※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。; Status GdipReleaseDC(GpGraphics* graphics, HDC hdc)
#uselib "gdiplus.dll"
#cfunc global GdipReleaseDC "GdipReleaseDC" intptr, intptr
; res = GdipReleaseDC(varptr(graphics), hdc)
; graphics : GpGraphics* in/out -> "intptr"
; hdc : HDC -> "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 (
	gdiplus = windows.NewLazySystemDLL("gdiplus.dll")
	procGdipReleaseDC = gdiplus.NewProc("GdipReleaseDC")
)

// graphics (GpGraphics* in/out), hdc (HDC)
r1, _, err := procGdipReleaseDC.Call(
	uintptr(graphics),
	uintptr(hdc),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipReleaseDC(
  graphics: Pointer;   // GpGraphics* in/out
  hdc: THandle   // HDC
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipReleaseDC';

result := DllCall("gdiplus\GdipReleaseDC"
    , "Ptr", graphics   ; GpGraphics* in/out
    , "Ptr", hdc   ; HDC
    , "Int")   ; return: Status

●GdipReleaseDC(graphics, hdc) = DLL("gdiplus.dll", "int GdipReleaseDC(void*, void*)")
# 呼び出し: GdipReleaseDC(graphics, hdc)
# graphics : GpGraphics* in/out -> "void*"
# 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)。