GdipSetLineColors

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

Status GdipSetLineColors(
    GpLineGradient* brush,
    DWORD color1,
    DWORD color2
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipSetLineColors(
    brush As IntPtr,   ' GpLineGradient* in/out
    color1 As UInteger,   ' DWORD
    color2 As UInteger   ' DWORD
) As Integer
End Function

' brush : GpLineGradient* in/out
' color1 : DWORD
' color2 : DWORD
Declare PtrSafe Function GdipSetLineColors Lib "gdiplus" ( _
    ByVal brush As LongPtr, _
    ByVal color1 As Long, _
    ByVal color2 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

GdipSetLineColors = ctypes.windll.gdiplus.GdipSetLineColors
GdipSetLineColors.restype = ctypes.c_int
GdipSetLineColors.argtypes = [
    ctypes.c_void_p,  # brush : GpLineGradient* in/out
    wintypes.DWORD,  # color1 : DWORD
    wintypes.DWORD,  # color2 : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipSetLineColors = Fiddle::Function.new(
  lib['GdipSetLineColors'],
  [
    Fiddle::TYPE_VOIDP,  # brush : GpLineGradient* in/out
    -Fiddle::TYPE_INT,  # color1 : DWORD
    -Fiddle::TYPE_INT,  # color2 : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipSetLineColors(
        brush: *mut GpLineGradient,  // GpLineGradient* in/out
        color1: u32,  // DWORD
        color2: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipSetLineColors(IntPtr brush, uint color1, uint color2);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipSetLineColors' -Namespace Win32 -PassThru
# $api::GdipSetLineColors(brush, color1, color2)

#uselib "gdiplus.dll"
#func global GdipSetLineColors "GdipSetLineColors" sptr, sptr, sptr
; GdipSetLineColors varptr(brush), color1, color2   ; 戻り値は stat
; brush : GpLineGradient* in/out -> "sptr"
; color1 : DWORD -> "sptr"
; color2 : DWORD -> "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 GdipSetLineColors "GdipSetLineColors" var, int, int
; res = GdipSetLineColors(brush, color1, color2)
; brush : GpLineGradient* in/out -> "var"
; color1 : DWORD -> "int"
; color2 : DWORD -> "int"
; ※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 GdipSetLineColors(GpLineGradient* brush, DWORD color1, DWORD color2)
#uselib "gdiplus.dll"
#cfunc global GdipSetLineColors "GdipSetLineColors" var, int, int
; res = GdipSetLineColors(brush, color1, color2)
; brush : GpLineGradient* in/out -> "var"
; color1 : DWORD -> "int"
; color2 : DWORD -> "int"
; ※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")
	procGdipSetLineColors = gdiplus.NewProc("GdipSetLineColors")
)

// brush (GpLineGradient* in/out), color1 (DWORD), color2 (DWORD)
r1, _, err := procGdipSetLineColors.Call(
	uintptr(brush),
	uintptr(color1),
	uintptr(color2),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipSetLineColors(
  brush: Pointer;   // GpLineGradient* in/out
  color1: DWORD;   // DWORD
  color2: DWORD   // DWORD
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipSetLineColors';

result := DllCall("gdiplus\GdipSetLineColors"
    , "Ptr", brush   ; GpLineGradient* in/out
    , "UInt", color1   ; DWORD
    , "UInt", color2   ; DWORD
    , "Int")   ; return: Status

●GdipSetLineColors(brush, color1, color2) = DLL("gdiplus.dll", "int GdipSetLineColors(void*, dword, dword)")
# 呼び出し: GdipSetLineColors(brush, color1, color2)
# brush : GpLineGradient* in/out -> "void*"
# color1 : DWORD -> "dword"
# color2 : DWORD -> "dword"
# 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)。