DuplicateIcon

// SHELL32.dll
#include <windows.h>

HICON DuplicateIcon(
    HINSTANCE hInst,   // optional
    HICON hIcon
);

<DllImport("SHELL32.dll", ExactSpelling:=True)>
Public Shared Function DuplicateIcon(
    hInst As IntPtr,   ' HINSTANCE optional
    hIcon As IntPtr   ' HICON
) As IntPtr
End Function

' hInst : HINSTANCE optional
' hIcon : HICON
Declare PtrSafe Function DuplicateIcon Lib "shell32" ( _
    ByVal hInst As LongPtr, _
    ByVal hIcon As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DuplicateIcon = ctypes.windll.shell32.DuplicateIcon
DuplicateIcon.restype = ctypes.c_void_p
DuplicateIcon.argtypes = [
    wintypes.HANDLE,  # hInst : HINSTANCE optional
    wintypes.HANDLE,  # hIcon : HICON
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
DuplicateIcon = Fiddle::Function.new(
  lib['DuplicateIcon'],
  [
    Fiddle::TYPE_VOIDP,  # hInst : HINSTANCE optional
    Fiddle::TYPE_VOIDP,  # hIcon : HICON
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "shell32")]
extern "system" {
    fn DuplicateIcon(
        hInst: *mut core::ffi::c_void,  // HINSTANCE optional
        hIcon: *mut core::ffi::c_void  // HICON
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll")]
public static extern IntPtr DuplicateIcon(IntPtr hInst, IntPtr hIcon);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_DuplicateIcon' -Namespace Win32 -PassThru
# $api::DuplicateIcon(hInst, hIcon)

#uselib "SHELL32.dll"
#func global DuplicateIcon "DuplicateIcon" sptr, sptr
; DuplicateIcon hInst, hIcon   ; 戻り値は stat
; hInst : HINSTANCE optional -> "sptr"
; hIcon : HICON -> "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 "SHELL32.dll"
#cfunc global DuplicateIcon "DuplicateIcon" sptr, sptr
; res = DuplicateIcon(hInst, hIcon)
; hInst : HINSTANCE optional -> "sptr"
; hIcon : HICON -> "sptr"

; HICON DuplicateIcon(HINSTANCE hInst, HICON hIcon)
#uselib "SHELL32.dll"
#cfunc global DuplicateIcon "DuplicateIcon" intptr, intptr
; res = DuplicateIcon(hInst, hIcon)
; hInst : HINSTANCE optional -> "intptr"
; hIcon : HICON -> "intptr"

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

var (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procDuplicateIcon = shell32.NewProc("DuplicateIcon")
)

// hInst (HINSTANCE optional), hIcon (HICON)
r1, _, err := procDuplicateIcon.Call(
	uintptr(hInst),
	uintptr(hIcon),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HICON

function DuplicateIcon(
  hInst: THandle;   // HINSTANCE optional
  hIcon: THandle   // HICON
): THandle; stdcall;
  external 'SHELL32.dll' name 'DuplicateIcon';

result := DllCall("SHELL32\DuplicateIcon"
    , "Ptr", hInst   ; HINSTANCE optional
    , "Ptr", hIcon   ; HICON
    , "Ptr")   ; return: HICON

●DuplicateIcon(hInst, hIcon) = DLL("SHELL32.dll", "void* DuplicateIcon(void*, void*)")
# 呼び出し: DuplicateIcon(hInst, hIcon)
# hInst : HINSTANCE optional -> "void*"
# hIcon : HICON -> "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)。