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DCICreateOffscreen

関数

オフスクリーン描画サーフェスを作成する。

DLLDCIMAN32.dll呼出規約winapi

シグネチャ

// DCIMAN32.dll
#include <windows.h>

INT DCICreateOffscreen(
    HDC hdc,
    DWORD dwCompression,
    DWORD dwRedMask,
    DWORD dwGreenMask,
    DWORD dwBlueMask,
    DWORD dwWidth,
    DWORD dwHeight,
    DWORD dwDCICaps,
    DWORD dwBitCount,
    DCIOFFSCREEN** lplpSurface
);

パラメーター

名前	型	方向	説明
hdc	HDC	in	オフスクリーンサーフェスを作成する対象のデバイスコンテキストハンドル。
dwCompression	DWORD	in	サーフェスの圧縮形式またはFourCCコードを指定する。
dwRedMask	DWORD	in	赤成分を表すビットマスク。
dwGreenMask	DWORD	in	緑成分を表すビットマスク。
dwBlueMask	DWORD	in	青成分を表すビットマスク。
dwWidth	DWORD	in	サーフェスの幅をピクセル単位で指定する。
dwHeight	DWORD	in	サーフェスの高さをピクセル単位で指定する。
dwDCICaps	DWORD	in	要求するDCIケイパビリティを表すフラグ。
dwBitCount	DWORD	in	1ピクセルあたりのビット数を指定する。
lplpSurface	DCIOFFSCREEN**	inout	作成されたオフスクリーンサーフェス(DCIOFFSCREEN)へのポインタを受け取る変数のアドレス。

戻り値の型: INT

各言語での呼び出し定義

// DCIMAN32.dll
#include <windows.h>

INT DCICreateOffscreen(
    HDC hdc,
    DWORD dwCompression,
    DWORD dwRedMask,
    DWORD dwGreenMask,
    DWORD dwBlueMask,
    DWORD dwWidth,
    DWORD dwHeight,
    DWORD dwDCICaps,
    DWORD dwBitCount,
    DCIOFFSCREEN** lplpSurface
);

[DllImport("DCIMAN32.dll", ExactSpelling = true)]
static extern int DCICreateOffscreen(
    IntPtr hdc,   // HDC
    uint dwCompression,   // DWORD
    uint dwRedMask,   // DWORD
    uint dwGreenMask,   // DWORD
    uint dwBlueMask,   // DWORD
    uint dwWidth,   // DWORD
    uint dwHeight,   // DWORD
    uint dwDCICaps,   // DWORD
    uint dwBitCount,   // DWORD
    IntPtr lplpSurface   // DCIOFFSCREEN** in/out
);

<DllImport("DCIMAN32.dll", ExactSpelling:=True)>
Public Shared Function DCICreateOffscreen(
    hdc As IntPtr,   ' HDC
    dwCompression As UInteger,   ' DWORD
    dwRedMask As UInteger,   ' DWORD
    dwGreenMask As UInteger,   ' DWORD
    dwBlueMask As UInteger,   ' DWORD
    dwWidth As UInteger,   ' DWORD
    dwHeight As UInteger,   ' DWORD
    dwDCICaps As UInteger,   ' DWORD
    dwBitCount As UInteger,   ' DWORD
    lplpSurface As IntPtr   ' DCIOFFSCREEN** in/out
) As Integer
End Function

' hdc : HDC
' dwCompression : DWORD
' dwRedMask : DWORD
' dwGreenMask : DWORD
' dwBlueMask : DWORD
' dwWidth : DWORD
' dwHeight : DWORD
' dwDCICaps : DWORD
' dwBitCount : DWORD
' lplpSurface : DCIOFFSCREEN** in/out
Declare PtrSafe Function DCICreateOffscreen Lib "dciman32" ( _
    ByVal hdc As LongPtr, _
    ByVal dwCompression As Long, _
    ByVal dwRedMask As Long, _
    ByVal dwGreenMask As Long, _
    ByVal dwBlueMask As Long, _
    ByVal dwWidth As Long, _
    ByVal dwHeight As Long, _
    ByVal dwDCICaps As Long, _
    ByVal dwBitCount As Long, _
    ByVal lplpSurface 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

DCICreateOffscreen = ctypes.windll.dciman32.DCICreateOffscreen
DCICreateOffscreen.restype = ctypes.c_int
DCICreateOffscreen.argtypes = [
    wintypes.HANDLE,  # hdc : HDC
    wintypes.DWORD,  # dwCompression : DWORD
    wintypes.DWORD,  # dwRedMask : DWORD
    wintypes.DWORD,  # dwGreenMask : DWORD
    wintypes.DWORD,  # dwBlueMask : DWORD
    wintypes.DWORD,  # dwWidth : DWORD
    wintypes.DWORD,  # dwHeight : DWORD
    wintypes.DWORD,  # dwDCICaps : DWORD
    wintypes.DWORD,  # dwBitCount : DWORD
    ctypes.c_void_p,  # lplpSurface : DCIOFFSCREEN** in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DCIMAN32.dll')
DCICreateOffscreen = Fiddle::Function.new(
  lib['DCICreateOffscreen'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC
    -Fiddle::TYPE_INT,  # dwCompression : DWORD
    -Fiddle::TYPE_INT,  # dwRedMask : DWORD
    -Fiddle::TYPE_INT,  # dwGreenMask : DWORD
    -Fiddle::TYPE_INT,  # dwBlueMask : DWORD
    -Fiddle::TYPE_INT,  # dwWidth : DWORD
    -Fiddle::TYPE_INT,  # dwHeight : DWORD
    -Fiddle::TYPE_INT,  # dwDCICaps : DWORD
    -Fiddle::TYPE_INT,  # dwBitCount : DWORD
    Fiddle::TYPE_VOIDP,  # lplpSurface : DCIOFFSCREEN** in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "dciman32")]
extern "system" {
    fn DCICreateOffscreen(
        hdc: *mut core::ffi::c_void,  // HDC
        dwCompression: u32,  // DWORD
        dwRedMask: u32,  // DWORD
        dwGreenMask: u32,  // DWORD
        dwBlueMask: u32,  // DWORD
        dwWidth: u32,  // DWORD
        dwHeight: u32,  // DWORD
        dwDCICaps: u32,  // DWORD
        dwBitCount: u32,  // DWORD
        lplpSurface: *mut *mut DCIOFFSCREEN  // DCIOFFSCREEN** in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DCIMAN32.dll")]
public static extern int DCICreateOffscreen(IntPtr hdc, uint dwCompression, uint dwRedMask, uint dwGreenMask, uint dwBlueMask, uint dwWidth, uint dwHeight, uint dwDCICaps, uint dwBitCount, IntPtr lplpSurface);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DCIMAN32_DCICreateOffscreen' -Namespace Win32 -PassThru
# $api::DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)

#uselib "DCIMAN32.dll"
#func global DCICreateOffscreen "DCICreateOffscreen" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; DCICreateOffscreen hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, varptr(lplpSurface)   ; 戻り値は stat
; hdc : HDC -> "sptr"
; dwCompression : DWORD -> "sptr"
; dwRedMask : DWORD -> "sptr"
; dwGreenMask : DWORD -> "sptr"
; dwBlueMask : DWORD -> "sptr"
; dwWidth : DWORD -> "sptr"
; dwHeight : DWORD -> "sptr"
; dwDCICaps : DWORD -> "sptr"
; dwBitCount : DWORD -> "sptr"
; lplpSurface : DCIOFFSCREEN** 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 "DCIMAN32.dll"
#cfunc global DCICreateOffscreen "DCICreateOffscreen" sptr, int, int, int, int, int, int, int, int, var
; res = DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)
; hdc : HDC -> "sptr"
; dwCompression : DWORD -> "int"
; dwRedMask : DWORD -> "int"
; dwGreenMask : DWORD -> "int"
; dwBlueMask : DWORD -> "int"
; dwWidth : DWORD -> "int"
; dwHeight : DWORD -> "int"
; dwDCICaps : DWORD -> "int"
; dwBitCount : DWORD -> "int"
; lplpSurface : DCIOFFSCREEN** 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 "DCIMAN32.dll"
#cfunc global DCICreateOffscreen "DCICreateOffscreen" sptr, int, int, int, int, int, int, int, int, sptr
; res = DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, varptr(lplpSurface))
; hdc : HDC -> "sptr"
; dwCompression : DWORD -> "int"
; dwRedMask : DWORD -> "int"
; dwGreenMask : DWORD -> "int"
; dwBlueMask : DWORD -> "int"
; dwWidth : DWORD -> "int"
; dwHeight : DWORD -> "int"
; dwDCICaps : DWORD -> "int"
; dwBitCount : DWORD -> "int"
; lplpSurface : DCIOFFSCREEN** 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:

; INT DCICreateOffscreen(HDC hdc, DWORD dwCompression, DWORD dwRedMask, DWORD dwGreenMask, DWORD dwBlueMask, DWORD dwWidth, DWORD dwHeight, DWORD dwDCICaps, DWORD dwBitCount, DCIOFFSCREEN** lplpSurface)
#uselib "DCIMAN32.dll"
#cfunc global DCICreateOffscreen "DCICreateOffscreen" intptr, int, int, int, int, int, int, int, int, var
; res = DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)
; hdc : HDC -> "intptr"
; dwCompression : DWORD -> "int"
; dwRedMask : DWORD -> "int"
; dwGreenMask : DWORD -> "int"
; dwBlueMask : DWORD -> "int"
; dwWidth : DWORD -> "int"
; dwHeight : DWORD -> "int"
; dwDCICaps : DWORD -> "int"
; dwBitCount : DWORD -> "int"
; lplpSurface : DCIOFFSCREEN** 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。; INT DCICreateOffscreen(HDC hdc, DWORD dwCompression, DWORD dwRedMask, DWORD dwGreenMask, DWORD dwBlueMask, DWORD dwWidth, DWORD dwHeight, DWORD dwDCICaps, DWORD dwBitCount, DCIOFFSCREEN** lplpSurface)
#uselib "DCIMAN32.dll"
#cfunc global DCICreateOffscreen "DCICreateOffscreen" intptr, int, int, int, int, int, int, int, int, intptr
; res = DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, varptr(lplpSurface))
; hdc : HDC -> "intptr"
; dwCompression : DWORD -> "int"
; dwRedMask : DWORD -> "int"
; dwGreenMask : DWORD -> "int"
; dwBlueMask : DWORD -> "int"
; dwWidth : DWORD -> "int"
; dwHeight : DWORD -> "int"
; dwDCICaps : DWORD -> "int"
; dwBitCount : DWORD -> "int"
; lplpSurface : DCIOFFSCREEN** 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 (
	dciman32 = windows.NewLazySystemDLL("DCIMAN32.dll")
	procDCICreateOffscreen = dciman32.NewProc("DCICreateOffscreen")
)

// hdc (HDC), dwCompression (DWORD), dwRedMask (DWORD), dwGreenMask (DWORD), dwBlueMask (DWORD), dwWidth (DWORD), dwHeight (DWORD), dwDCICaps (DWORD), dwBitCount (DWORD), lplpSurface (DCIOFFSCREEN** in/out)
r1, _, err := procDCICreateOffscreen.Call(
	uintptr(hdc),
	uintptr(dwCompression),
	uintptr(dwRedMask),
	uintptr(dwGreenMask),
	uintptr(dwBlueMask),
	uintptr(dwWidth),
	uintptr(dwHeight),
	uintptr(dwDCICaps),
	uintptr(dwBitCount),
	uintptr(lplpSurface),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function DCICreateOffscreen(
  hdc: THandle;   // HDC
  dwCompression: DWORD;   // DWORD
  dwRedMask: DWORD;   // DWORD
  dwGreenMask: DWORD;   // DWORD
  dwBlueMask: DWORD;   // DWORD
  dwWidth: DWORD;   // DWORD
  dwHeight: DWORD;   // DWORD
  dwDCICaps: DWORD;   // DWORD
  dwBitCount: DWORD;   // DWORD
  lplpSurface: Pointer   // DCIOFFSCREEN** in/out
): Integer; stdcall;
  external 'DCIMAN32.dll' name 'DCICreateOffscreen';

result := DllCall("DCIMAN32\DCICreateOffscreen"
    , "Ptr", hdc   ; HDC
    , "UInt", dwCompression   ; DWORD
    , "UInt", dwRedMask   ; DWORD
    , "UInt", dwGreenMask   ; DWORD
    , "UInt", dwBlueMask   ; DWORD
    , "UInt", dwWidth   ; DWORD
    , "UInt", dwHeight   ; DWORD
    , "UInt", dwDCICaps   ; DWORD
    , "UInt", dwBitCount   ; DWORD
    , "Ptr", lplpSurface   ; DCIOFFSCREEN** in/out
    , "Int")   ; return: INT

●DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface) = DLL("DCIMAN32.dll", "int DCICreateOffscreen(void*, dword, dword, dword, dword, dword, dword, dword, dword, void*)")
# 呼び出し: DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)
# hdc : HDC -> "void*"
# dwCompression : DWORD -> "dword"
# dwRedMask : DWORD -> "dword"
# dwGreenMask : DWORD -> "dword"
# dwBlueMask : DWORD -> "dword"
# dwWidth : DWORD -> "dword"
# dwHeight : DWORD -> "dword"
# dwDCICaps : DWORD -> "dword"
# dwBitCount : DWORD -> "dword"
# lplpSurface : DCIOFFSCREEN** 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)。

const std = @import("std");

extern "dciman32" fn DCICreateOffscreen(
    hdc: ?*anyopaque, // HDC
    dwCompression: u32, // DWORD
    dwRedMask: u32, // DWORD
    dwGreenMask: u32, // DWORD
    dwBlueMask: u32, // DWORD
    dwWidth: u32, // DWORD
    dwHeight: u32, // DWORD
    dwDCICaps: u32, // DWORD
    dwBitCount: u32, // DWORD
    lplpSurface: [*c][*c]DCIOFFSCREEN // DCIOFFSCREEN** in/out
) callconv(std.os.windows.WINAPI) i32;

proc DCICreateOffscreen(
    hdc: pointer,  # HDC
    dwCompression: uint32,  # DWORD
    dwRedMask: uint32,  # DWORD
    dwGreenMask: uint32,  # DWORD
    dwBlueMask: uint32,  # DWORD
    dwWidth: uint32,  # DWORD
    dwHeight: uint32,  # DWORD
    dwDCICaps: uint32,  # DWORD
    dwBitCount: uint32,  # DWORD
    lplpSurface: ptr DCIOFFSCREEN  # DCIOFFSCREEN** in/out
): int32 {.importc: "DCICreateOffscreen", stdcall, dynlib: "DCIMAN32.dll".}

pragma(lib, "dciman32");
extern(Windows)
int DCICreateOffscreen(
    void* hdc,   // HDC
    uint dwCompression,   // DWORD
    uint dwRedMask,   // DWORD
    uint dwGreenMask,   // DWORD
    uint dwBlueMask,   // DWORD
    uint dwWidth,   // DWORD
    uint dwHeight,   // DWORD
    uint dwDCICaps,   // DWORD
    uint dwBitCount,   // DWORD
    DCIOFFSCREEN** lplpSurface   // DCIOFFSCREEN** in/out
);

ccall((:DCICreateOffscreen, "DCIMAN32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, UInt32, UInt32, UInt32, UInt32, UInt32, UInt32, UInt32, UInt32, Ptr{DCIOFFSCREEN}),
      hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)
# hdc : HDC -> Ptr{Cvoid}
# dwCompression : DWORD -> UInt32
# dwRedMask : DWORD -> UInt32
# dwGreenMask : DWORD -> UInt32
# dwBlueMask : DWORD -> UInt32
# dwWidth : DWORD -> UInt32
# dwHeight : DWORD -> UInt32
# dwDCICaps : DWORD -> UInt32
# dwBitCount : DWORD -> UInt32
# lplpSurface : DCIOFFSCREEN** in/out -> Ptr{DCIOFFSCREEN}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t DCICreateOffscreen(
    void* hdc,
    uint32_t dwCompression,
    uint32_t dwRedMask,
    uint32_t dwGreenMask,
    uint32_t dwBlueMask,
    uint32_t dwWidth,
    uint32_t dwHeight,
    uint32_t dwDCICaps,
    uint32_t dwBitCount,
    void* lplpSurface);
]]
local dciman32 = ffi.load("dciman32")
-- dciman32.DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)
-- hdc : HDC
-- dwCompression : DWORD
-- dwRedMask : DWORD
-- dwGreenMask : DWORD
-- dwBlueMask : DWORD
-- dwWidth : DWORD
-- dwHeight : DWORD
-- dwDCICaps : DWORD
-- dwBitCount : DWORD
-- lplpSurface : DCIOFFSCREEN** in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('DCIMAN32.dll');
const DCICreateOffscreen = lib.func('__stdcall', 'DCICreateOffscreen', 'int32_t', ['void *', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'void *']);
// DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)
// hdc : HDC -> 'void *'
// dwCompression : DWORD -> 'uint32_t'
// dwRedMask : DWORD -> 'uint32_t'
// dwGreenMask : DWORD -> 'uint32_t'
// dwBlueMask : DWORD -> 'uint32_t'
// dwWidth : DWORD -> 'uint32_t'
// dwHeight : DWORD -> 'uint32_t'
// dwDCICaps : DWORD -> 'uint32_t'
// dwBitCount : DWORD -> 'uint32_t'
// lplpSurface : DCIOFFSCREEN** in/out -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("DCIMAN32.dll", {
  DCICreateOffscreen: { parameters: ["pointer", "u32", "u32", "u32", "u32", "u32", "u32", "u32", "u32", "pointer"], result: "i32" },
});
// lib.symbols.DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface)
// hdc : HDC -> "pointer"
// dwCompression : DWORD -> "u32"
// dwRedMask : DWORD -> "u32"
// dwGreenMask : DWORD -> "u32"
// dwBlueMask : DWORD -> "u32"
// dwWidth : DWORD -> "u32"
// dwHeight : DWORD -> "u32"
// dwDCICaps : DWORD -> "u32"
// dwBitCount : DWORD -> "u32"
// lplpSurface : DCIOFFSCREEN** in/out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t DCICreateOffscreen(
    void* hdc,
    uint32_t dwCompression,
    uint32_t dwRedMask,
    uint32_t dwGreenMask,
    uint32_t dwBlueMask,
    uint32_t dwWidth,
    uint32_t dwHeight,
    uint32_t dwDCICaps,
    uint32_t dwBitCount,
    void* lplpSurface);
C, "DCIMAN32.dll");
// $ffi->DCICreateOffscreen(hdc, dwCompression, dwRedMask, dwGreenMask, dwBlueMask, dwWidth, dwHeight, dwDCICaps, dwBitCount, lplpSurface);
// hdc : HDC
// dwCompression : DWORD
// dwRedMask : DWORD
// dwGreenMask : DWORD
// dwBlueMask : DWORD
// dwWidth : DWORD
// dwHeight : DWORD
// dwDCICaps : DWORD
// dwBitCount : DWORD
// lplpSurface : DCIOFFSCREEN** in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Dciman32 extends StdCallLibrary {
    Dciman32 INSTANCE = Native.load("dciman32", Dciman32.class);
    int DCICreateOffscreen(
        Pointer hdc,   // HDC
        int dwCompression,   // DWORD
        int dwRedMask,   // DWORD
        int dwGreenMask,   // DWORD
        int dwBlueMask,   // DWORD
        int dwWidth,   // DWORD
        int dwHeight,   // DWORD
        int dwDCICaps,   // DWORD
        int dwBitCount,   // DWORD
        Pointer lplpSurface   // DCIOFFSCREEN** in/out
    );
}

@[Link("dciman32")]
lib LibDCIMAN32
  fun DCICreateOffscreen = DCICreateOffscreen(
    hdc : Void*,   # HDC
    dwCompression : UInt32,   # DWORD
    dwRedMask : UInt32,   # DWORD
    dwGreenMask : UInt32,   # DWORD
    dwBlueMask : UInt32,   # DWORD
    dwWidth : UInt32,   # DWORD
    dwHeight : UInt32,   # DWORD
    dwDCICaps : UInt32,   # DWORD
    dwBitCount : UInt32,   # DWORD
    lplpSurface : DCIOFFSCREEN**   # DCIOFFSCREEN** in/out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef DCICreateOffscreenNative = Int32 Function(Pointer<Void>, Uint32, Uint32, Uint32, Uint32, Uint32, Uint32, Uint32, Uint32, Pointer<Void>);
typedef DCICreateOffscreenDart = int Function(Pointer<Void>, int, int, int, int, int, int, int, int, Pointer<Void>);
final DCICreateOffscreen = DynamicLibrary.open('DCIMAN32.dll')
    .lookupFunction<DCICreateOffscreenNative, DCICreateOffscreenDart>('DCICreateOffscreen');
// hdc : HDC -> Pointer<Void>
// dwCompression : DWORD -> Uint32
// dwRedMask : DWORD -> Uint32
// dwGreenMask : DWORD -> Uint32
// dwBlueMask : DWORD -> Uint32
// dwWidth : DWORD -> Uint32
// dwHeight : DWORD -> Uint32
// dwDCICaps : DWORD -> Uint32
// dwBitCount : DWORD -> Uint32
// lplpSurface : DCIOFFSCREEN** in/out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function DCICreateOffscreen(
  hdc: THandle;   // HDC
  dwCompression: DWORD;   // DWORD
  dwRedMask: DWORD;   // DWORD
  dwGreenMask: DWORD;   // DWORD
  dwBlueMask: DWORD;   // DWORD
  dwWidth: DWORD;   // DWORD
  dwHeight: DWORD;   // DWORD
  dwDCICaps: DWORD;   // DWORD
  dwBitCount: DWORD;   // DWORD
  lplpSurface: Pointer   // DCIOFFSCREEN** in/out
): Integer; stdcall;
  external 'DCIMAN32.dll' name 'DCICreateOffscreen';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "DCICreateOffscreen"
  c_DCICreateOffscreen :: Ptr () -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> Ptr () -> IO Int32
-- hdc : HDC -> Ptr ()
-- dwCompression : DWORD -> Word32
-- dwRedMask : DWORD -> Word32
-- dwGreenMask : DWORD -> Word32
-- dwBlueMask : DWORD -> Word32
-- dwWidth : DWORD -> Word32
-- dwHeight : DWORD -> Word32
-- dwDCICaps : DWORD -> Word32
-- dwBitCount : DWORD -> Word32
-- lplpSurface : DCIOFFSCREEN** in/out -> Ptr ()
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let dcicreateoffscreen =
  foreign "DCICreateOffscreen"
    ((ptr void) @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> (ptr void) @-> returning int32_t)
(* hdc : HDC -> (ptr void) *)
(* dwCompression : DWORD -> uint32_t *)
(* dwRedMask : DWORD -> uint32_t *)
(* dwGreenMask : DWORD -> uint32_t *)
(* dwBlueMask : DWORD -> uint32_t *)
(* dwWidth : DWORD -> uint32_t *)
(* dwHeight : DWORD -> uint32_t *)
(* dwDCICaps : DWORD -> uint32_t *)
(* dwBitCount : DWORD -> uint32_t *)
(* lplpSurface : DCIOFFSCREEN** in/out -> (ptr void) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library dciman32 (t "DCIMAN32.dll"))
(cffi:use-foreign-library dciman32)

(cffi:defcfun ("DCICreateOffscreen" dcicreate-offscreen :convention :stdcall) :int32
  (hdc :pointer)   ; HDC
  (dw-compression :uint32)   ; DWORD
  (dw-red-mask :uint32)   ; DWORD
  (dw-green-mask :uint32)   ; DWORD
  (dw-blue-mask :uint32)   ; DWORD
  (dw-width :uint32)   ; DWORD
  (dw-height :uint32)   ; DWORD
  (dw-dcicaps :uint32)   ; DWORD
  (dw-bit-count :uint32)   ; DWORD
  (lplp-surface :pointer))   ; DCIOFFSCREEN** in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $DCICreateOffscreen = Win32::API::More->new('DCIMAN32',
    'int DCICreateOffscreen(HANDLE hdc, DWORD dwCompression, DWORD dwRedMask, DWORD dwGreenMask, DWORD dwBlueMask, DWORD dwWidth, DWORD dwHeight, DWORD dwDCICaps, DWORD dwBitCount, LPVOID lplpSurface)');
# my $ret = $DCICreateOffscreen->Call($hdc, $dwCompression, $dwRedMask, $dwGreenMask, $dwBlueMask, $dwWidth, $dwHeight, $dwDCICaps, $dwBitCount, $lplpSurface);
# hdc : HDC -> HANDLE
# dwCompression : DWORD -> DWORD
# dwRedMask : DWORD -> DWORD
# dwGreenMask : DWORD -> DWORD
# dwBlueMask : DWORD -> DWORD
# dwWidth : DWORD -> DWORD
# dwHeight : DWORD -> DWORD
# dwDCICaps : DWORD -> DWORD
# dwBitCount : DWORD -> DWORD
# lplpSurface : DCIOFFSCREEN** in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

DCICreateOffscreen

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