GdipGetRegionData

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

Status GdipGetRegionData(
    GpRegion* region,
    BYTE* buffer,
    DWORD bufferSize,
    DWORD* sizeFilled   // optional
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetRegionData(
    region As IntPtr,   ' GpRegion* in/out
    buffer As IntPtr,   ' BYTE* out
    bufferSize As UInteger,   ' DWORD
    sizeFilled As IntPtr   ' DWORD* optional, out
) As Integer
End Function

' region : GpRegion* in/out
' buffer : BYTE* out
' bufferSize : DWORD
' sizeFilled : DWORD* optional, out
Declare PtrSafe Function GdipGetRegionData Lib "gdiplus" ( _
    ByVal region As LongPtr, _
    ByVal buffer As LongPtr, _
    ByVal bufferSize As Long, _
    ByVal sizeFilled 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

GdipGetRegionData = ctypes.windll.gdiplus.GdipGetRegionData
GdipGetRegionData.restype = ctypes.c_int
GdipGetRegionData.argtypes = [
    ctypes.c_void_p,  # region : GpRegion* in/out
    ctypes.POINTER(ctypes.c_ubyte),  # buffer : BYTE* out
    wintypes.DWORD,  # bufferSize : DWORD
    ctypes.POINTER(wintypes.DWORD),  # sizeFilled : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetRegionData = Fiddle::Function.new(
  lib['GdipGetRegionData'],
  [
    Fiddle::TYPE_VOIDP,  # region : GpRegion* in/out
    Fiddle::TYPE_VOIDP,  # buffer : BYTE* out
    -Fiddle::TYPE_INT,  # bufferSize : DWORD
    Fiddle::TYPE_VOIDP,  # sizeFilled : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipGetRegionData(
        region: *mut GpRegion,  // GpRegion* in/out
        buffer: *mut u8,  // BYTE* out
        bufferSize: u32,  // DWORD
        sizeFilled: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetRegionData(IntPtr region, IntPtr buffer, uint bufferSize, IntPtr sizeFilled);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetRegionData' -Namespace Win32 -PassThru
# $api::GdipGetRegionData(region, buffer, bufferSize, sizeFilled)

#uselib "gdiplus.dll"
#func global GdipGetRegionData "GdipGetRegionData" sptr, sptr, sptr, sptr
; GdipGetRegionData varptr(region), varptr(buffer), bufferSize, varptr(sizeFilled)   ; 戻り値は stat
; region : GpRegion* in/out -> "sptr"
; buffer : BYTE* out -> "sptr"
; bufferSize : DWORD -> "sptr"
; sizeFilled : DWORD* optional, 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。

#uselib "gdiplus.dll"
#cfunc global GdipGetRegionData "GdipGetRegionData" var, var, int, var
; res = GdipGetRegionData(region, buffer, bufferSize, sizeFilled)
; region : GpRegion* in/out -> "var"
; buffer : BYTE* out -> "var"
; bufferSize : DWORD -> "int"
; sizeFilled : DWORD* optional, 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。

; Status GdipGetRegionData(GpRegion* region, BYTE* buffer, DWORD bufferSize, DWORD* sizeFilled)
#uselib "gdiplus.dll"
#cfunc global GdipGetRegionData "GdipGetRegionData" var, var, int, var
; res = GdipGetRegionData(region, buffer, bufferSize, sizeFilled)
; region : GpRegion* in/out -> "var"
; buffer : BYTE* out -> "var"
; bufferSize : DWORD -> "int"
; sizeFilled : DWORD* optional, 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。

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

var (
	gdiplus = windows.NewLazySystemDLL("gdiplus.dll")
	procGdipGetRegionData = gdiplus.NewProc("GdipGetRegionData")
)

// region (GpRegion* in/out), buffer (BYTE* out), bufferSize (DWORD), sizeFilled (DWORD* optional, out)
r1, _, err := procGdipGetRegionData.Call(
	uintptr(region),
	uintptr(buffer),
	uintptr(bufferSize),
	uintptr(sizeFilled),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipGetRegionData(
  region: Pointer;   // GpRegion* in/out
  buffer: Pointer;   // BYTE* out
  bufferSize: DWORD;   // DWORD
  sizeFilled: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetRegionData';

result := DllCall("gdiplus\GdipGetRegionData"
    , "Ptr", region   ; GpRegion* in/out
    , "Ptr", buffer   ; BYTE* out
    , "UInt", bufferSize   ; DWORD
    , "Ptr", sizeFilled   ; DWORD* optional, out
    , "Int")   ; return: Status

●GdipGetRegionData(region, buffer, bufferSize, sizeFilled) = DLL("gdiplus.dll", "int GdipGetRegionData(void*, void*, dword, void*)")
# 呼び出し: GdipGetRegionData(region, buffer, bufferSize, sizeFilled)
# region : GpRegion* in/out -> "void*"
# buffer : BYTE* out -> "void*"
# bufferSize : DWORD -> "dword"
# sizeFilled : DWORD* optional, 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)。