GdipGetLineColors

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

Status GdipGetLineColors(
    GpLineGradient* brush,
    DWORD* colors
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetLineColors(
    brush As IntPtr,   ' GpLineGradient* in/out
    ByRef colors As UInteger   ' DWORD* in/out
) As Integer
End Function

' brush : GpLineGradient* in/out
' colors : DWORD* in/out
Declare PtrSafe Function GdipGetLineColors Lib "gdiplus" ( _
    ByVal brush As LongPtr, _
    ByRef colors 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

GdipGetLineColors = ctypes.windll.gdiplus.GdipGetLineColors
GdipGetLineColors.restype = ctypes.c_int
GdipGetLineColors.argtypes = [
    ctypes.c_void_p,  # brush : GpLineGradient* in/out
    ctypes.POINTER(wintypes.DWORD),  # colors : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetLineColors = Fiddle::Function.new(
  lib['GdipGetLineColors'],
  [
    Fiddle::TYPE_VOIDP,  # brush : GpLineGradient* in/out
    Fiddle::TYPE_VOIDP,  # colors : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipGetLineColors(
        brush: *mut GpLineGradient,  // GpLineGradient* in/out
        colors: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetLineColors(IntPtr brush, ref uint colors);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetLineColors' -Namespace Win32 -PassThru
# $api::GdipGetLineColors(brush, colors)

#uselib "gdiplus.dll"
#func global GdipGetLineColors "GdipGetLineColors" sptr, sptr
; GdipGetLineColors varptr(brush), varptr(colors)   ; 戻り値は stat
; brush : GpLineGradient* in/out -> "sptr"
; colors : DWORD* 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 GdipGetLineColors "GdipGetLineColors" var, var
; res = GdipGetLineColors(brush, colors)
; brush : GpLineGradient* in/out -> "var"
; colors : DWORD* 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 GdipGetLineColors(GpLineGradient* brush, DWORD* colors)
#uselib "gdiplus.dll"
#cfunc global GdipGetLineColors "GdipGetLineColors" var, var
; res = GdipGetLineColors(brush, colors)
; brush : GpLineGradient* in/out -> "var"
; colors : DWORD* 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")
	procGdipGetLineColors = gdiplus.NewProc("GdipGetLineColors")
)

// brush (GpLineGradient* in/out), colors (DWORD* in/out)
r1, _, err := procGdipGetLineColors.Call(
	uintptr(brush),
	uintptr(colors),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipGetLineColors(
  brush: Pointer;   // GpLineGradient* in/out
  colors: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetLineColors';

result := DllCall("gdiplus\GdipGetLineColors"
    , "Ptr", brush   ; GpLineGradient* in/out
    , "Ptr", colors   ; DWORD* in/out
    , "Int")   ; return: Status

●GdipGetLineColors(brush, colors) = DLL("gdiplus.dll", "int GdipGetLineColors(void*, void*)")
# 呼び出し: GdipGetLineColors(brush, colors)
# brush : GpLineGradient* in/out -> "void*"
# colors : DWORD* 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)。