OleGetIconOfClass

// OLE32.dll
#include <windows.h>

HGLOBAL OleGetIconOfClass(
    const GUID* rclsid,
    LPWSTR lpszLabel,   // optional
    BOOL fUseTypeAsLabel
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function OleGetIconOfClass(
    ByRef rclsid As Guid,   ' GUID*
    <MarshalAs(UnmanagedType.LPWStr)> lpszLabel As String,   ' LPWSTR optional
    fUseTypeAsLabel As Boolean   ' BOOL
) As IntPtr
End Function

' rclsid : GUID*
' lpszLabel : LPWSTR optional
' fUseTypeAsLabel : BOOL
Declare PtrSafe Function OleGetIconOfClass Lib "ole32" ( _
    ByVal rclsid As LongPtr, _
    ByVal lpszLabel As LongPtr, _
    ByVal fUseTypeAsLabel 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

OleGetIconOfClass = ctypes.windll.ole32.OleGetIconOfClass
OleGetIconOfClass.restype = ctypes.c_void_p
OleGetIconOfClass.argtypes = [
    ctypes.c_void_p,  # rclsid : GUID*
    wintypes.LPCWSTR,  # lpszLabel : LPWSTR optional
    wintypes.BOOL,  # fUseTypeAsLabel : BOOL
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
OleGetIconOfClass = Fiddle::Function.new(
  lib['OleGetIconOfClass'],
  [
    Fiddle::TYPE_VOIDP,  # rclsid : GUID*
    Fiddle::TYPE_VOIDP,  # lpszLabel : LPWSTR optional
    Fiddle::TYPE_INT,  # fUseTypeAsLabel : BOOL
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "ole32")]
extern "system" {
    fn OleGetIconOfClass(
        rclsid: *const GUID,  // GUID*
        lpszLabel: *mut u16,  // LPWSTR optional
        fUseTypeAsLabel: i32  // BOOL
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern IntPtr OleGetIconOfClass(ref Guid rclsid, [MarshalAs(UnmanagedType.LPWStr)] string lpszLabel, bool fUseTypeAsLabel);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_OleGetIconOfClass' -Namespace Win32 -PassThru
# $api::OleGetIconOfClass(rclsid, lpszLabel, fUseTypeAsLabel)

#uselib "OLE32.dll"
#func global OleGetIconOfClass "OleGetIconOfClass" sptr, sptr, sptr
; OleGetIconOfClass varptr(rclsid), lpszLabel, fUseTypeAsLabel   ; 戻り値は stat
; rclsid : GUID* -> "sptr"
; lpszLabel : LPWSTR optional -> "sptr"
; fUseTypeAsLabel : BOOL -> "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 "OLE32.dll"
#cfunc global OleGetIconOfClass "OleGetIconOfClass" var, wstr, int
; res = OleGetIconOfClass(rclsid, lpszLabel, fUseTypeAsLabel)
; rclsid : GUID* -> "var"
; lpszLabel : LPWSTR optional -> "wstr"
; fUseTypeAsLabel : BOOL -> "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。

; HGLOBAL OleGetIconOfClass(GUID* rclsid, LPWSTR lpszLabel, BOOL fUseTypeAsLabel)
#uselib "OLE32.dll"
#cfunc global OleGetIconOfClass "OleGetIconOfClass" var, wstr, int
; res = OleGetIconOfClass(rclsid, lpszLabel, fUseTypeAsLabel)
; rclsid : GUID* -> "var"
; lpszLabel : LPWSTR optional -> "wstr"
; fUseTypeAsLabel : BOOL -> "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 (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procOleGetIconOfClass = ole32.NewProc("OleGetIconOfClass")
)

// rclsid (GUID*), lpszLabel (LPWSTR optional), fUseTypeAsLabel (BOOL)
r1, _, err := procOleGetIconOfClass.Call(
	uintptr(rclsid),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszLabel))),
	uintptr(fUseTypeAsLabel),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HGLOBAL

function OleGetIconOfClass(
  rclsid: PGUID;   // GUID*
  lpszLabel: PWideChar;   // LPWSTR optional
  fUseTypeAsLabel: BOOL   // BOOL
): THandle; stdcall;
  external 'OLE32.dll' name 'OleGetIconOfClass';

result := DllCall("OLE32\OleGetIconOfClass"
    , "Ptr", rclsid   ; GUID*
    , "WStr", lpszLabel   ; LPWSTR optional
    , "Int", fUseTypeAsLabel   ; BOOL
    , "Ptr")   ; return: HGLOBAL

●OleGetIconOfClass(rclsid, lpszLabel, fUseTypeAsLabel) = DLL("OLE32.dll", "void* OleGetIconOfClass(void*, char*, bool)")
# 呼び出し: OleGetIconOfClass(rclsid, lpszLabel, fUseTypeAsLabel)
# rclsid : GUID* -> "void*"
# lpszLabel : LPWSTR optional -> "char*"
# fUseTypeAsLabel : BOOL -> "bool"
# 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)。