GdipSetPenStartCap

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

Status GdipSetPenStartCap(
    GpPen* pen,
    LineCap startCap
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipSetPenStartCap(
    pen As IntPtr,   ' GpPen* in/out
    startCap As Integer   ' LineCap
) As Integer
End Function

' pen : GpPen* in/out
' startCap : LineCap
Declare PtrSafe Function GdipSetPenStartCap Lib "gdiplus" ( _
    ByVal pen As LongPtr, _
    ByVal startCap 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

GdipSetPenStartCap = ctypes.windll.gdiplus.GdipSetPenStartCap
GdipSetPenStartCap.restype = ctypes.c_int
GdipSetPenStartCap.argtypes = [
    ctypes.c_void_p,  # pen : GpPen* in/out
    ctypes.c_int,  # startCap : LineCap
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipSetPenStartCap = Fiddle::Function.new(
  lib['GdipSetPenStartCap'],
  [
    Fiddle::TYPE_VOIDP,  # pen : GpPen* in/out
    Fiddle::TYPE_INT,  # startCap : LineCap
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipSetPenStartCap(
        pen: *mut GpPen,  // GpPen* in/out
        startCap: i32  // LineCap
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipSetPenStartCap(IntPtr pen, int startCap);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipSetPenStartCap' -Namespace Win32 -PassThru
# $api::GdipSetPenStartCap(pen, startCap)

#uselib "gdiplus.dll"
#func global GdipSetPenStartCap "GdipSetPenStartCap" sptr, sptr
; GdipSetPenStartCap varptr(pen), startCap   ; 戻り値は stat
; pen : GpPen* in/out -> "sptr"
; startCap : LineCap -> "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 GdipSetPenStartCap "GdipSetPenStartCap" var, int
; res = GdipSetPenStartCap(pen, startCap)
; pen : GpPen* in/out -> "var"
; startCap : LineCap -> "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 GdipSetPenStartCap(GpPen* pen, LineCap startCap)
#uselib "gdiplus.dll"
#cfunc global GdipSetPenStartCap "GdipSetPenStartCap" var, int
; res = GdipSetPenStartCap(pen, startCap)
; pen : GpPen* in/out -> "var"
; startCap : LineCap -> "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")
	procGdipSetPenStartCap = gdiplus.NewProc("GdipSetPenStartCap")
)

// pen (GpPen* in/out), startCap (LineCap)
r1, _, err := procGdipSetPenStartCap.Call(
	uintptr(pen),
	uintptr(startCap),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipSetPenStartCap(
  pen: Pointer;   // GpPen* in/out
  startCap: Integer   // LineCap
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipSetPenStartCap';

result := DllCall("gdiplus\GdipSetPenStartCap"
    , "Ptr", pen   ; GpPen* in/out
    , "Int", startCap   ; LineCap
    , "Int")   ; return: Status

●GdipSetPenStartCap(pen, startCap) = DLL("gdiplus.dll", "int GdipSetPenStartCap(void*, int)")
# 呼び出し: GdipSetPenStartCap(pen, startCap)
# pen : GpPen* in/out -> "void*"
# startCap : LineCap -> "int"
# 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)。