GdipLoadImageFromFile

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

Status GdipLoadImageFromFile(
    LPCWSTR filename,
    GpImage** image
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipLoadImageFromFile(
    <MarshalAs(UnmanagedType.LPWStr)> filename As String,   ' LPCWSTR
    image As IntPtr   ' GpImage** in/out
) As Integer
End Function

' filename : LPCWSTR
' image : GpImage** in/out
Declare PtrSafe Function GdipLoadImageFromFile Lib "gdiplus" ( _
    ByVal filename As LongPtr, _
    ByVal image 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

GdipLoadImageFromFile = ctypes.windll.gdiplus.GdipLoadImageFromFile
GdipLoadImageFromFile.restype = ctypes.c_int
GdipLoadImageFromFile.argtypes = [
    wintypes.LPCWSTR,  # filename : LPCWSTR
    ctypes.c_void_p,  # image : GpImage** in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipLoadImageFromFile = Fiddle::Function.new(
  lib['GdipLoadImageFromFile'],
  [
    Fiddle::TYPE_VOIDP,  # filename : LPCWSTR
    Fiddle::TYPE_VOIDP,  # image : GpImage** in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipLoadImageFromFile(
        filename: *const u16,  // LPCWSTR
        image: *mut *mut GpImage  // GpImage** in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipLoadImageFromFile([MarshalAs(UnmanagedType.LPWStr)] string filename, IntPtr image);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipLoadImageFromFile' -Namespace Win32 -PassThru
# $api::GdipLoadImageFromFile(filename, image)

#uselib "gdiplus.dll"
#func global GdipLoadImageFromFile "GdipLoadImageFromFile" sptr, sptr
; GdipLoadImageFromFile filename, varptr(image)   ; 戻り値は stat
; filename : LPCWSTR -> "sptr"
; image : GpImage** 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 GdipLoadImageFromFile "GdipLoadImageFromFile" wstr, var
; res = GdipLoadImageFromFile(filename, image)
; filename : LPCWSTR -> "wstr"
; image : GpImage** in/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 GdipLoadImageFromFile(LPCWSTR filename, GpImage** image)
#uselib "gdiplus.dll"
#cfunc global GdipLoadImageFromFile "GdipLoadImageFromFile" wstr, var
; res = GdipLoadImageFromFile(filename, image)
; filename : LPCWSTR -> "wstr"
; image : GpImage** in/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")
	procGdipLoadImageFromFile = gdiplus.NewProc("GdipLoadImageFromFile")
)

// filename (LPCWSTR), image (GpImage** in/out)
r1, _, err := procGdipLoadImageFromFile.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(filename))),
	uintptr(image),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipLoadImageFromFile(
  filename: PWideChar;   // LPCWSTR
  image: Pointer   // GpImage** in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipLoadImageFromFile';

result := DllCall("gdiplus\GdipLoadImageFromFile"
    , "WStr", filename   ; LPCWSTR
    , "Ptr", image   ; GpImage** in/out
    , "Int")   ; return: Status

●GdipLoadImageFromFile(filename, image) = DLL("gdiplus.dll", "int GdipLoadImageFromFile(char*, void*)")
# 呼び出し: GdipLoadImageFromFile(filename, image)
# filename : LPCWSTR -> "char*"
# image : GpImage** 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)。