Polyline

// GDI32.dll
#include <windows.h>

BOOL Polyline(
    HDC hdc,
    const POINT* apt,
    INT cpt
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function Polyline(
    hdc As IntPtr,   ' HDC
    apt As IntPtr,   ' POINT*
    cpt As Integer   ' INT
) As Boolean
End Function

' hdc : HDC
' apt : POINT*
' cpt : INT
Declare PtrSafe Function Polyline Lib "gdi32" ( _
    ByVal hdc As LongPtr, _
    ByVal apt As LongPtr, _
    ByVal cpt 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

Polyline = ctypes.windll.gdi32.Polyline
Polyline.restype = wintypes.BOOL
Polyline.argtypes = [
    wintypes.HANDLE,  # hdc : HDC
    ctypes.c_void_p,  # apt : POINT*
    ctypes.c_int,  # cpt : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
Polyline = Fiddle::Function.new(
  lib['Polyline'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC
    Fiddle::TYPE_VOIDP,  # apt : POINT*
    Fiddle::TYPE_INT,  # cpt : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn Polyline(
        hdc: *mut core::ffi::c_void,  // HDC
        apt: *const POINT,  // POINT*
        cpt: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("GDI32.dll")]
public static extern bool Polyline(IntPtr hdc, IntPtr apt, int cpt);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_Polyline' -Namespace Win32 -PassThru
# $api::Polyline(hdc, apt, cpt)

#uselib "GDI32.dll"
#func global Polyline "Polyline" sptr, sptr, sptr
; Polyline hdc, varptr(apt), cpt   ; 戻り値は stat
; hdc : HDC -> "sptr"
; apt : POINT* -> "sptr"
; cpt : INT -> "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 "GDI32.dll"
#cfunc global Polyline "Polyline" sptr, var, int
; res = Polyline(hdc, apt, cpt)
; hdc : HDC -> "sptr"
; apt : POINT* -> "var"
; cpt : INT -> "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。

; BOOL Polyline(HDC hdc, POINT* apt, INT cpt)
#uselib "GDI32.dll"
#cfunc global Polyline "Polyline" intptr, var, int
; res = Polyline(hdc, apt, cpt)
; hdc : HDC -> "intptr"
; apt : POINT* -> "var"
; cpt : INT -> "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 (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procPolyline = gdi32.NewProc("Polyline")
)

// hdc (HDC), apt (POINT*), cpt (INT)
r1, _, err := procPolyline.Call(
	uintptr(hdc),
	uintptr(apt),
	uintptr(cpt),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function Polyline(
  hdc: THandle;   // HDC
  apt: Pointer;   // POINT*
  cpt: Integer   // INT
): BOOL; stdcall;
  external 'GDI32.dll' name 'Polyline';

result := DllCall("GDI32\Polyline"
    , "Ptr", hdc   ; HDC
    , "Ptr", apt   ; POINT*
    , "Int", cpt   ; INT
    , "Int")   ; return: BOOL

●Polyline(hdc, apt, cpt) = DLL("GDI32.dll", "bool Polyline(void*, void*, int)")
# 呼び出し: Polyline(hdc, apt, cpt)
# hdc : HDC -> "void*"
# apt : POINT* -> "void*"
# cpt : INT -> "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)。