GdipCreateLineBrush

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

Status GdipCreateLineBrush(
    const PointF* point1,
    const PointF* point2,
    DWORD color1,
    DWORD color2,
    WrapMode wrapMode,
    GpLineGradient** lineGradient
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipCreateLineBrush(
    point1 As IntPtr,   ' PointF*
    point2 As IntPtr,   ' PointF*
    color1 As UInteger,   ' DWORD
    color2 As UInteger,   ' DWORD
    wrapMode As Integer,   ' WrapMode
    lineGradient As IntPtr   ' GpLineGradient** in/out
) As Integer
End Function

' point1 : PointF*
' point2 : PointF*
' color1 : DWORD
' color2 : DWORD
' wrapMode : WrapMode
' lineGradient : GpLineGradient** in/out
Declare PtrSafe Function GdipCreateLineBrush Lib "gdiplus" ( _
    ByVal point1 As LongPtr, _
    ByVal point2 As LongPtr, _
    ByVal color1 As Long, _
    ByVal color2 As Long, _
    ByVal wrapMode As Long, _
    ByVal lineGradient 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

GdipCreateLineBrush = ctypes.windll.gdiplus.GdipCreateLineBrush
GdipCreateLineBrush.restype = ctypes.c_int
GdipCreateLineBrush.argtypes = [
    ctypes.c_void_p,  # point1 : PointF*
    ctypes.c_void_p,  # point2 : PointF*
    wintypes.DWORD,  # color1 : DWORD
    wintypes.DWORD,  # color2 : DWORD
    ctypes.c_int,  # wrapMode : WrapMode
    ctypes.c_void_p,  # lineGradient : GpLineGradient** in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipCreateLineBrush = Fiddle::Function.new(
  lib['GdipCreateLineBrush'],
  [
    Fiddle::TYPE_VOIDP,  # point1 : PointF*
    Fiddle::TYPE_VOIDP,  # point2 : PointF*
    -Fiddle::TYPE_INT,  # color1 : DWORD
    -Fiddle::TYPE_INT,  # color2 : DWORD
    Fiddle::TYPE_INT,  # wrapMode : WrapMode
    Fiddle::TYPE_VOIDP,  # lineGradient : GpLineGradient** in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipCreateLineBrush(
        point1: *const PointF,  // PointF*
        point2: *const PointF,  // PointF*
        color1: u32,  // DWORD
        color2: u32,  // DWORD
        wrapMode: i32,  // WrapMode
        lineGradient: *mut *mut GpLineGradient  // GpLineGradient** in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipCreateLineBrush(IntPtr point1, IntPtr point2, uint color1, uint color2, int wrapMode, IntPtr lineGradient);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipCreateLineBrush' -Namespace Win32 -PassThru
# $api::GdipCreateLineBrush(point1, point2, color1, color2, wrapMode, lineGradient)

#uselib "gdiplus.dll"
#func global GdipCreateLineBrush "GdipCreateLineBrush" sptr, sptr, sptr, sptr, sptr, sptr
; GdipCreateLineBrush varptr(point1), varptr(point2), color1, color2, wrapMode, varptr(lineGradient)   ; 戻り値は stat
; point1 : PointF* -> "sptr"
; point2 : PointF* -> "sptr"
; color1 : DWORD -> "sptr"
; color2 : DWORD -> "sptr"
; wrapMode : WrapMode -> "sptr"
; lineGradient : GpLineGradient** 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 GdipCreateLineBrush "GdipCreateLineBrush" var, var, int, int, int, var
; res = GdipCreateLineBrush(point1, point2, color1, color2, wrapMode, lineGradient)
; point1 : PointF* -> "var"
; point2 : PointF* -> "var"
; color1 : DWORD -> "int"
; color2 : DWORD -> "int"
; wrapMode : WrapMode -> "int"
; lineGradient : GpLineGradient** 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 GdipCreateLineBrush(PointF* point1, PointF* point2, DWORD color1, DWORD color2, WrapMode wrapMode, GpLineGradient** lineGradient)
#uselib "gdiplus.dll"
#cfunc global GdipCreateLineBrush "GdipCreateLineBrush" var, var, int, int, int, var
; res = GdipCreateLineBrush(point1, point2, color1, color2, wrapMode, lineGradient)
; point1 : PointF* -> "var"
; point2 : PointF* -> "var"
; color1 : DWORD -> "int"
; color2 : DWORD -> "int"
; wrapMode : WrapMode -> "int"
; lineGradient : GpLineGradient** 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")
	procGdipCreateLineBrush = gdiplus.NewProc("GdipCreateLineBrush")
)

// point1 (PointF*), point2 (PointF*), color1 (DWORD), color2 (DWORD), wrapMode (WrapMode), lineGradient (GpLineGradient** in/out)
r1, _, err := procGdipCreateLineBrush.Call(
	uintptr(point1),
	uintptr(point2),
	uintptr(color1),
	uintptr(color2),
	uintptr(wrapMode),
	uintptr(lineGradient),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipCreateLineBrush(
  point1: Pointer;   // PointF*
  point2: Pointer;   // PointF*
  color1: DWORD;   // DWORD
  color2: DWORD;   // DWORD
  wrapMode: Integer;   // WrapMode
  lineGradient: Pointer   // GpLineGradient** in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipCreateLineBrush';

result := DllCall("gdiplus\GdipCreateLineBrush"
    , "Ptr", point1   ; PointF*
    , "Ptr", point2   ; PointF*
    , "UInt", color1   ; DWORD
    , "UInt", color2   ; DWORD
    , "Int", wrapMode   ; WrapMode
    , "Ptr", lineGradient   ; GpLineGradient** in/out
    , "Int")   ; return: Status

●GdipCreateLineBrush(point1, point2, color1, color2, wrapMode, lineGradient) = DLL("gdiplus.dll", "int GdipCreateLineBrush(void*, void*, dword, dword, int, void*)")
# 呼び出し: GdipCreateLineBrush(point1, point2, color1, color2, wrapMode, lineGradient)
# point1 : PointF* -> "void*"
# point2 : PointF* -> "void*"
# color1 : DWORD -> "dword"
# color2 : DWORD -> "dword"
# wrapMode : WrapMode -> "int"
# lineGradient : GpLineGradient** 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)。