GdipSaveImageToStream

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

Status GdipSaveImageToStream(
    GpImage* image,
    IStream* stream,
    const GUID* clsidEncoder,
    const EncoderParameters* encoderParams
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipSaveImageToStream(
    image As IntPtr,   ' GpImage* in/out
    stream As IntPtr,   ' IStream*
    ByRef clsidEncoder As Guid,   ' GUID*
    encoderParams As IntPtr   ' EncoderParameters*
) As Integer
End Function

' image : GpImage* in/out
' stream : IStream*
' clsidEncoder : GUID*
' encoderParams : EncoderParameters*
Declare PtrSafe Function GdipSaveImageToStream Lib "gdiplus" ( _
    ByVal image As LongPtr, _
    ByVal stream As LongPtr, _
    ByVal clsidEncoder As LongPtr, _
    ByVal encoderParams 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

GdipSaveImageToStream = ctypes.windll.gdiplus.GdipSaveImageToStream
GdipSaveImageToStream.restype = ctypes.c_int
GdipSaveImageToStream.argtypes = [
    ctypes.c_void_p,  # image : GpImage* in/out
    ctypes.c_void_p,  # stream : IStream*
    ctypes.c_void_p,  # clsidEncoder : GUID*
    ctypes.c_void_p,  # encoderParams : EncoderParameters*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipSaveImageToStream = Fiddle::Function.new(
  lib['GdipSaveImageToStream'],
  [
    Fiddle::TYPE_VOIDP,  # image : GpImage* in/out
    Fiddle::TYPE_VOIDP,  # stream : IStream*
    Fiddle::TYPE_VOIDP,  # clsidEncoder : GUID*
    Fiddle::TYPE_VOIDP,  # encoderParams : EncoderParameters*
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipSaveImageToStream(
        image: *mut GpImage,  // GpImage* in/out
        stream: *mut core::ffi::c_void,  // IStream*
        clsidEncoder: *const GUID,  // GUID*
        encoderParams: *const EncoderParameters  // EncoderParameters*
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipSaveImageToStream(IntPtr image, IntPtr stream, ref Guid clsidEncoder, IntPtr encoderParams);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipSaveImageToStream' -Namespace Win32 -PassThru
# $api::GdipSaveImageToStream(image, stream, clsidEncoder, encoderParams)

#uselib "gdiplus.dll"
#func global GdipSaveImageToStream "GdipSaveImageToStream" sptr, sptr, sptr, sptr
; GdipSaveImageToStream varptr(image), stream, varptr(clsidEncoder), varptr(encoderParams)   ; 戻り値は stat
; image : GpImage* in/out -> "sptr"
; stream : IStream* -> "sptr"
; clsidEncoder : GUID* -> "sptr"
; encoderParams : EncoderParameters* -> "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 GdipSaveImageToStream "GdipSaveImageToStream" var, sptr, var, var
; res = GdipSaveImageToStream(image, stream, clsidEncoder, encoderParams)
; image : GpImage* in/out -> "var"
; stream : IStream* -> "sptr"
; clsidEncoder : GUID* -> "var"
; encoderParams : EncoderParameters* -> "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 GdipSaveImageToStream(GpImage* image, IStream* stream, GUID* clsidEncoder, EncoderParameters* encoderParams)
#uselib "gdiplus.dll"
#cfunc global GdipSaveImageToStream "GdipSaveImageToStream" var, intptr, var, var
; res = GdipSaveImageToStream(image, stream, clsidEncoder, encoderParams)
; image : GpImage* in/out -> "var"
; stream : IStream* -> "intptr"
; clsidEncoder : GUID* -> "var"
; encoderParams : EncoderParameters* -> "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")
	procGdipSaveImageToStream = gdiplus.NewProc("GdipSaveImageToStream")
)

// image (GpImage* in/out), stream (IStream*), clsidEncoder (GUID*), encoderParams (EncoderParameters*)
r1, _, err := procGdipSaveImageToStream.Call(
	uintptr(image),
	uintptr(stream),
	uintptr(clsidEncoder),
	uintptr(encoderParams),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipSaveImageToStream(
  image: Pointer;   // GpImage* in/out
  stream: Pointer;   // IStream*
  clsidEncoder: PGUID;   // GUID*
  encoderParams: Pointer   // EncoderParameters*
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipSaveImageToStream';

result := DllCall("gdiplus\GdipSaveImageToStream"
    , "Ptr", image   ; GpImage* in/out
    , "Ptr", stream   ; IStream*
    , "Ptr", clsidEncoder   ; GUID*
    , "Ptr", encoderParams   ; EncoderParameters*
    , "Int")   ; return: Status

●GdipSaveImageToStream(image, stream, clsidEncoder, encoderParams) = DLL("gdiplus.dll", "int GdipSaveImageToStream(void*, void*, void*, void*)")
# 呼び出し: GdipSaveImageToStream(image, stream, clsidEncoder, encoderParams)
# image : GpImage* in/out -> "void*"
# stream : IStream* -> "void*"
# clsidEncoder : GUID* -> "void*"
# encoderParams : EncoderParameters* -> "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)。