GetDCPenColor

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

COLORREF GetDCPenColor(
    HDC hdc
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function GetDCPenColor(
    hdc As IntPtr   ' HDC
) As UInteger
End Function

' hdc : HDC
Declare PtrSafe Function GetDCPenColor Lib "gdi32" ( _
    ByVal hdc 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

GetDCPenColor = ctypes.windll.gdi32.GetDCPenColor
GetDCPenColor.restype = wintypes.DWORD
GetDCPenColor.argtypes = [
    wintypes.HANDLE,  # hdc : HDC
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetDCPenColor = Fiddle::Function.new(
  lib['GetDCPenColor'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC
  ],
  -Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn GetDCPenColor(
        hdc: *mut core::ffi::c_void  // HDC
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll")]
public static extern uint GetDCPenColor(IntPtr hdc);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetDCPenColor' -Namespace Win32 -PassThru
# $api::GetDCPenColor(hdc)

#uselib "GDI32.dll"
#func global GetDCPenColor "GetDCPenColor" sptr
; GetDCPenColor hdc   ; 戻り値は stat
; hdc : HDC -> "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 GetDCPenColor "GetDCPenColor" sptr
; res = GetDCPenColor(hdc)
; hdc : HDC -> "sptr"

; COLORREF GetDCPenColor(HDC hdc)
#uselib "GDI32.dll"
#cfunc global GetDCPenColor "GetDCPenColor" intptr
; res = GetDCPenColor(hdc)
; hdc : HDC -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procGetDCPenColor = gdi32.NewProc("GetDCPenColor")
)

// hdc (HDC)
r1, _, err := procGetDCPenColor.Call(
	uintptr(hdc),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // COLORREF

function GetDCPenColor(
  hdc: THandle   // HDC
): DWORD; stdcall;
  external 'GDI32.dll' name 'GetDCPenColor';

result := DllCall("GDI32\GetDCPenColor"
    , "Ptr", hdc   ; HDC
    , "UInt")   ; return: COLORREF

●GetDCPenColor(hdc) = DLL("GDI32.dll", "dword GetDCPenColor(void*)")
# 呼び出し: GetDCPenColor(hdc)
# hdc : HDC -> "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)。