DsGetIcon

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

HICON DsGetIcon(
    DWORD dwFlags,
    LPCWSTR pszObjectClass,
    INT cxImage,
    INT cyImage
);

<DllImport("dsuiext.dll", ExactSpelling:=True)>
Public Shared Function DsGetIcon(
    dwFlags As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pszObjectClass As String,   ' LPCWSTR
    cxImage As Integer,   ' INT
    cyImage As Integer   ' INT
) As IntPtr
End Function

' dwFlags : DWORD
' pszObjectClass : LPCWSTR
' cxImage : INT
' cyImage : INT
Declare PtrSafe Function DsGetIcon Lib "dsuiext" ( _
    ByVal dwFlags As Long, _
    ByVal pszObjectClass As LongPtr, _
    ByVal cxImage As Long, _
    ByVal cyImage As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DsGetIcon = ctypes.windll.dsuiext.DsGetIcon
DsGetIcon.restype = ctypes.c_void_p
DsGetIcon.argtypes = [
    wintypes.DWORD,  # dwFlags : DWORD
    wintypes.LPCWSTR,  # pszObjectClass : LPCWSTR
    ctypes.c_int,  # cxImage : INT
    ctypes.c_int,  # cyImage : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dsuiext.dll')
DsGetIcon = Fiddle::Function.new(
  lib['DsGetIcon'],
  [
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pszObjectClass : LPCWSTR
    Fiddle::TYPE_INT,  # cxImage : INT
    Fiddle::TYPE_INT,  # cyImage : INT
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "dsuiext")]
extern "system" {
    fn DsGetIcon(
        dwFlags: u32,  // DWORD
        pszObjectClass: *const u16,  // LPCWSTR
        cxImage: i32,  // INT
        cyImage: i32  // INT
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dsuiext.dll")]
public static extern IntPtr DsGetIcon(uint dwFlags, [MarshalAs(UnmanagedType.LPWStr)] string pszObjectClass, int cxImage, int cyImage);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dsuiext_DsGetIcon' -Namespace Win32 -PassThru
# $api::DsGetIcon(dwFlags, pszObjectClass, cxImage, cyImage)

#uselib "dsuiext.dll"
#func global DsGetIcon "DsGetIcon" sptr, sptr, sptr, sptr
; DsGetIcon dwFlags, pszObjectClass, cxImage, cyImage   ; 戻り値は stat
; dwFlags : DWORD -> "sptr"
; pszObjectClass : LPCWSTR -> "sptr"
; cxImage : INT -> "sptr"
; cyImage : 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 "dsuiext.dll"
#cfunc global DsGetIcon "DsGetIcon" int, wstr, int, int
; res = DsGetIcon(dwFlags, pszObjectClass, cxImage, cyImage)
; dwFlags : DWORD -> "int"
; pszObjectClass : LPCWSTR -> "wstr"
; cxImage : INT -> "int"
; cyImage : INT -> "int"

; HICON DsGetIcon(DWORD dwFlags, LPCWSTR pszObjectClass, INT cxImage, INT cyImage)
#uselib "dsuiext.dll"
#cfunc global DsGetIcon "DsGetIcon" int, wstr, int, int
; res = DsGetIcon(dwFlags, pszObjectClass, cxImage, cyImage)
; dwFlags : DWORD -> "int"
; pszObjectClass : LPCWSTR -> "wstr"
; cxImage : INT -> "int"
; cyImage : INT -> "int"

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

var (
	dsuiext = windows.NewLazySystemDLL("dsuiext.dll")
	procDsGetIcon = dsuiext.NewProc("DsGetIcon")
)

// dwFlags (DWORD), pszObjectClass (LPCWSTR), cxImage (INT), cyImage (INT)
r1, _, err := procDsGetIcon.Call(
	uintptr(dwFlags),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszObjectClass))),
	uintptr(cxImage),
	uintptr(cyImage),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HICON

function DsGetIcon(
  dwFlags: DWORD;   // DWORD
  pszObjectClass: PWideChar;   // LPCWSTR
  cxImage: Integer;   // INT
  cyImage: Integer   // INT
): THandle; stdcall;
  external 'dsuiext.dll' name 'DsGetIcon';

result := DllCall("dsuiext\DsGetIcon"
    , "UInt", dwFlags   ; DWORD
    , "WStr", pszObjectClass   ; LPCWSTR
    , "Int", cxImage   ; INT
    , "Int", cyImage   ; INT
    , "Ptr")   ; return: HICON

●DsGetIcon(dwFlags, pszObjectClass, cxImage, cyImage) = DLL("dsuiext.dll", "void* DsGetIcon(dword, char*, int, int)")
# 呼び出し: DsGetIcon(dwFlags, pszObjectClass, cxImage, cyImage)
# dwFlags : DWORD -> "dword"
# pszObjectClass : LPCWSTR -> "char*"
# cxImage : INT -> "int"
# cyImage : 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)。