GdipGetImageDecoders

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

Status GdipGetImageDecoders(
    DWORD numDecoders,
    DWORD size,
    ImageCodecInfo* decoders
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetImageDecoders(
    numDecoders As UInteger,   ' DWORD
    size As UInteger,   ' DWORD
    decoders As IntPtr   ' ImageCodecInfo* out
) As Integer
End Function

' numDecoders : DWORD
' size : DWORD
' decoders : ImageCodecInfo* out
Declare PtrSafe Function GdipGetImageDecoders Lib "gdiplus" ( _
    ByVal numDecoders As Long, _
    ByVal size As Long, _
    ByVal decoders 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

GdipGetImageDecoders = ctypes.windll.gdiplus.GdipGetImageDecoders
GdipGetImageDecoders.restype = ctypes.c_int
GdipGetImageDecoders.argtypes = [
    wintypes.DWORD,  # numDecoders : DWORD
    wintypes.DWORD,  # size : DWORD
    ctypes.c_void_p,  # decoders : ImageCodecInfo* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetImageDecoders = Fiddle::Function.new(
  lib['GdipGetImageDecoders'],
  [
    -Fiddle::TYPE_INT,  # numDecoders : DWORD
    -Fiddle::TYPE_INT,  # size : DWORD
    Fiddle::TYPE_VOIDP,  # decoders : ImageCodecInfo* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipGetImageDecoders(
        numDecoders: u32,  // DWORD
        size: u32,  // DWORD
        decoders: *mut ImageCodecInfo  // ImageCodecInfo* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetImageDecoders(uint numDecoders, uint size, IntPtr decoders);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetImageDecoders' -Namespace Win32 -PassThru
# $api::GdipGetImageDecoders(numDecoders, size, decoders)

#uselib "gdiplus.dll"
#func global GdipGetImageDecoders "GdipGetImageDecoders" sptr, sptr, sptr
; GdipGetImageDecoders numDecoders, size, varptr(decoders)   ; 戻り値は stat
; numDecoders : DWORD -> "sptr"
; size : DWORD -> "sptr"
; decoders : ImageCodecInfo* 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 GdipGetImageDecoders "GdipGetImageDecoders" int, int, var
; res = GdipGetImageDecoders(numDecoders, size, decoders)
; numDecoders : DWORD -> "int"
; size : DWORD -> "int"
; decoders : ImageCodecInfo* 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 GdipGetImageDecoders(DWORD numDecoders, DWORD size, ImageCodecInfo* decoders)
#uselib "gdiplus.dll"
#cfunc global GdipGetImageDecoders "GdipGetImageDecoders" int, int, var
; res = GdipGetImageDecoders(numDecoders, size, decoders)
; numDecoders : DWORD -> "int"
; size : DWORD -> "int"
; decoders : ImageCodecInfo* 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")
	procGdipGetImageDecoders = gdiplus.NewProc("GdipGetImageDecoders")
)

// numDecoders (DWORD), size (DWORD), decoders (ImageCodecInfo* out)
r1, _, err := procGdipGetImageDecoders.Call(
	uintptr(numDecoders),
	uintptr(size),
	uintptr(decoders),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipGetImageDecoders(
  numDecoders: DWORD;   // DWORD
  size: DWORD;   // DWORD
  decoders: Pointer   // ImageCodecInfo* out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetImageDecoders';

result := DllCall("gdiplus\GdipGetImageDecoders"
    , "UInt", numDecoders   ; DWORD
    , "UInt", size   ; DWORD
    , "Ptr", decoders   ; ImageCodecInfo* out
    , "Int")   ; return: Status

●GdipGetImageDecoders(numDecoders, size, decoders) = DLL("gdiplus.dll", "int GdipGetImageDecoders(dword, dword, void*)")
# 呼び出し: GdipGetImageDecoders(numDecoders, size, decoders)
# numDecoders : DWORD -> "dword"
# size : DWORD -> "dword"
# decoders : ImageCodecInfo* 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)。