GdipGetImagePalette

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

Status GdipGetImagePalette(
    GpImage* image,
    ColorPalette* palette,
    INT size
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetImagePalette(
    image As IntPtr,   ' GpImage* in/out
    palette As IntPtr,   ' ColorPalette* in/out
    size As Integer   ' INT
) As Integer
End Function

' image : GpImage* in/out
' palette : ColorPalette* in/out
' size : INT
Declare PtrSafe Function GdipGetImagePalette Lib "gdiplus" ( _
    ByVal image As LongPtr, _
    ByVal palette As LongPtr, _
    ByVal size As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GdipGetImagePalette = ctypes.windll.gdiplus.GdipGetImagePalette
GdipGetImagePalette.restype = ctypes.c_int
GdipGetImagePalette.argtypes = [
    ctypes.c_void_p,  # image : GpImage* in/out
    ctypes.c_void_p,  # palette : ColorPalette* in/out
    ctypes.c_int,  # size : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetImagePalette = Fiddle::Function.new(
  lib['GdipGetImagePalette'],
  [
    Fiddle::TYPE_VOIDP,  # image : GpImage* in/out
    Fiddle::TYPE_VOIDP,  # palette : ColorPalette* in/out
    Fiddle::TYPE_INT,  # size : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipGetImagePalette(
        image: *mut GpImage,  // GpImage* in/out
        palette: *mut ColorPalette,  // ColorPalette* in/out
        size: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetImagePalette(IntPtr image, IntPtr palette, int size);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetImagePalette' -Namespace Win32 -PassThru
# $api::GdipGetImagePalette(image, palette, size)

#uselib "gdiplus.dll"
#func global GdipGetImagePalette "GdipGetImagePalette" sptr, sptr, sptr
; GdipGetImagePalette varptr(image), varptr(palette), size   ; 戻り値は stat
; image : GpImage* in/out -> "sptr"
; palette : ColorPalette* in/out -> "sptr"
; size : INT -> "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 GdipGetImagePalette "GdipGetImagePalette" var, var, int
; res = GdipGetImagePalette(image, palette, size)
; image : GpImage* in/out -> "var"
; palette : ColorPalette* in/out -> "var"
; size : INT -> "int"
; ※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 GdipGetImagePalette(GpImage* image, ColorPalette* palette, INT size)
#uselib "gdiplus.dll"
#cfunc global GdipGetImagePalette "GdipGetImagePalette" var, var, int
; res = GdipGetImagePalette(image, palette, size)
; image : GpImage* in/out -> "var"
; palette : ColorPalette* in/out -> "var"
; size : INT -> "int"
; ※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")
	procGdipGetImagePalette = gdiplus.NewProc("GdipGetImagePalette")
)

// image (GpImage* in/out), palette (ColorPalette* in/out), size (INT)
r1, _, err := procGdipGetImagePalette.Call(
	uintptr(image),
	uintptr(palette),
	uintptr(size),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipGetImagePalette(
  image: Pointer;   // GpImage* in/out
  palette: Pointer;   // ColorPalette* in/out
  size: Integer   // INT
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetImagePalette';

result := DllCall("gdiplus\GdipGetImagePalette"
    , "Ptr", image   ; GpImage* in/out
    , "Ptr", palette   ; ColorPalette* in/out
    , "Int", size   ; INT
    , "Int")   ; return: Status

●GdipGetImagePalette(image, palette, size) = DLL("gdiplus.dll", "int GdipGetImagePalette(void*, void*, int)")
# 呼び出し: GdipGetImagePalette(image, palette, size)
# image : GpImage* in/out -> "void*"
# palette : ColorPalette* in/out -> "void*"
# size : INT -> "int"
# 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)。