GdipGetImageThumbnail

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

Status GdipGetImageThumbnail(
    GpImage* image,
    DWORD thumbWidth,
    DWORD thumbHeight,
    GpImage** thumbImage,
    INT_PTR callback,
    void* callbackData
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetImageThumbnail(
    image As IntPtr,   ' GpImage* in/out
    thumbWidth As UInteger,   ' DWORD
    thumbHeight As UInteger,   ' DWORD
    thumbImage As IntPtr,   ' GpImage** in/out
    callback As IntPtr,   ' INT_PTR
    callbackData As IntPtr   ' void* in/out
) As Integer
End Function

' image : GpImage* in/out
' thumbWidth : DWORD
' thumbHeight : DWORD
' thumbImage : GpImage** in/out
' callback : INT_PTR
' callbackData : void* in/out
Declare PtrSafe Function GdipGetImageThumbnail Lib "gdiplus" ( _
    ByVal image As LongPtr, _
    ByVal thumbWidth As Long, _
    ByVal thumbHeight As Long, _
    ByVal thumbImage As LongPtr, _
    ByVal callback As LongPtr, _
    ByVal callbackData 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

GdipGetImageThumbnail = ctypes.windll.gdiplus.GdipGetImageThumbnail
GdipGetImageThumbnail.restype = ctypes.c_int
GdipGetImageThumbnail.argtypes = [
    ctypes.c_void_p,  # image : GpImage* in/out
    wintypes.DWORD,  # thumbWidth : DWORD
    wintypes.DWORD,  # thumbHeight : DWORD
    ctypes.c_void_p,  # thumbImage : GpImage** in/out
    ctypes.c_ssize_t,  # callback : INT_PTR
    ctypes.POINTER(None),  # callbackData : void* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetImageThumbnail = Fiddle::Function.new(
  lib['GdipGetImageThumbnail'],
  [
    Fiddle::TYPE_VOIDP,  # image : GpImage* in/out
    -Fiddle::TYPE_INT,  # thumbWidth : DWORD
    -Fiddle::TYPE_INT,  # thumbHeight : DWORD
    Fiddle::TYPE_VOIDP,  # thumbImage : GpImage** in/out
    Fiddle::TYPE_INTPTR_T,  # callback : INT_PTR
    Fiddle::TYPE_VOIDP,  # callbackData : void* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipGetImageThumbnail(
        image: *mut GpImage,  // GpImage* in/out
        thumbWidth: u32,  // DWORD
        thumbHeight: u32,  // DWORD
        thumbImage: *mut *mut GpImage,  // GpImage** in/out
        callback: isize,  // INT_PTR
        callbackData: *mut ()  // void* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetImageThumbnail(IntPtr image, uint thumbWidth, uint thumbHeight, IntPtr thumbImage, IntPtr callback, IntPtr callbackData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetImageThumbnail' -Namespace Win32 -PassThru
# $api::GdipGetImageThumbnail(image, thumbWidth, thumbHeight, thumbImage, callback, callbackData)

#uselib "gdiplus.dll"
#func global GdipGetImageThumbnail "GdipGetImageThumbnail" sptr, sptr, sptr, sptr, sptr, sptr
; GdipGetImageThumbnail varptr(image), thumbWidth, thumbHeight, varptr(thumbImage), callback, callbackData   ; 戻り値は stat
; image : GpImage* in/out -> "sptr"
; thumbWidth : DWORD -> "sptr"
; thumbHeight : DWORD -> "sptr"
; thumbImage : GpImage** in/out -> "sptr"
; callback : INT_PTR -> "sptr"
; callbackData : void* 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。

#uselib "gdiplus.dll"
#cfunc global GdipGetImageThumbnail "GdipGetImageThumbnail" var, int, int, var, sptr, sptr
; res = GdipGetImageThumbnail(image, thumbWidth, thumbHeight, thumbImage, callback, callbackData)
; image : GpImage* in/out -> "var"
; thumbWidth : DWORD -> "int"
; thumbHeight : DWORD -> "int"
; thumbImage : GpImage** in/out -> "var"
; callback : INT_PTR -> "sptr"
; callbackData : void* in/out -> "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。

; Status GdipGetImageThumbnail(GpImage* image, DWORD thumbWidth, DWORD thumbHeight, GpImage** thumbImage, INT_PTR callback, void* callbackData)
#uselib "gdiplus.dll"
#cfunc global GdipGetImageThumbnail "GdipGetImageThumbnail" var, int, int, var, intptr, intptr
; res = GdipGetImageThumbnail(image, thumbWidth, thumbHeight, thumbImage, callback, callbackData)
; image : GpImage* in/out -> "var"
; thumbWidth : DWORD -> "int"
; thumbHeight : DWORD -> "int"
; thumbImage : GpImage** in/out -> "var"
; callback : INT_PTR -> "intptr"
; callbackData : void* in/out -> "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。

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

var (
	gdiplus = windows.NewLazySystemDLL("gdiplus.dll")
	procGdipGetImageThumbnail = gdiplus.NewProc("GdipGetImageThumbnail")
)

// image (GpImage* in/out), thumbWidth (DWORD), thumbHeight (DWORD), thumbImage (GpImage** in/out), callback (INT_PTR), callbackData (void* in/out)
r1, _, err := procGdipGetImageThumbnail.Call(
	uintptr(image),
	uintptr(thumbWidth),
	uintptr(thumbHeight),
	uintptr(thumbImage),
	uintptr(callback),
	uintptr(callbackData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipGetImageThumbnail(
  image: Pointer;   // GpImage* in/out
  thumbWidth: DWORD;   // DWORD
  thumbHeight: DWORD;   // DWORD
  thumbImage: Pointer;   // GpImage** in/out
  callback: NativeInt;   // INT_PTR
  callbackData: Pointer   // void* in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetImageThumbnail';

result := DllCall("gdiplus\GdipGetImageThumbnail"
    , "Ptr", image   ; GpImage* in/out
    , "UInt", thumbWidth   ; DWORD
    , "UInt", thumbHeight   ; DWORD
    , "Ptr", thumbImage   ; GpImage** in/out
    , "Ptr", callback   ; INT_PTR
    , "Ptr", callbackData   ; void* in/out
    , "Int")   ; return: Status

●GdipGetImageThumbnail(image, thumbWidth, thumbHeight, thumbImage, callback, callbackData) = DLL("gdiplus.dll", "int GdipGetImageThumbnail(void*, dword, dword, void*, int, void*)")
# 呼び出し: GdipGetImageThumbnail(image, thumbWidth, thumbHeight, thumbImage, callback, callbackData)
# image : GpImage* in/out -> "void*"
# thumbWidth : DWORD -> "dword"
# thumbHeight : DWORD -> "dword"
# thumbImage : GpImage** in/out -> "void*"
# callback : INT_PTR -> "int"
# callbackData : void* 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)。