Shell_GetCachedImageIndexW

// SHELL32.dll  (Unicode / -W)
#include <windows.h>

INT Shell_GetCachedImageIndexW(
    LPCWSTR pszIconPath,
    INT iIconIndex,
    DWORD uIconFlags
);

<DllImport("SHELL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function Shell_GetCachedImageIndexW(
    <MarshalAs(UnmanagedType.LPWStr)> pszIconPath As String,   ' LPCWSTR
    iIconIndex As Integer,   ' INT
    uIconFlags As UInteger   ' DWORD
) As Integer
End Function

' pszIconPath : LPCWSTR
' iIconIndex : INT
' uIconFlags : DWORD
Declare PtrSafe Function Shell_GetCachedImageIndexW Lib "shell32" ( _
    ByVal pszIconPath As LongPtr, _
    ByVal iIconIndex As Long, _
    ByVal uIconFlags As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

Shell_GetCachedImageIndexW = ctypes.windll.shell32.Shell_GetCachedImageIndexW
Shell_GetCachedImageIndexW.restype = ctypes.c_int
Shell_GetCachedImageIndexW.argtypes = [
    wintypes.LPCWSTR,  # pszIconPath : LPCWSTR
    ctypes.c_int,  # iIconIndex : INT
    wintypes.DWORD,  # uIconFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
Shell_GetCachedImageIndexW = Fiddle::Function.new(
  lib['Shell_GetCachedImageIndexW'],
  [
    Fiddle::TYPE_VOIDP,  # pszIconPath : LPCWSTR
    Fiddle::TYPE_INT,  # iIconIndex : INT
    -Fiddle::TYPE_INT,  # uIconFlags : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shell32")]
extern "system" {
    fn Shell_GetCachedImageIndexW(
        pszIconPath: *const u16,  // LPCWSTR
        iIconIndex: i32,  // INT
        uIconFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll", CharSet = CharSet.Unicode)]
public static extern int Shell_GetCachedImageIndexW([MarshalAs(UnmanagedType.LPWStr)] string pszIconPath, int iIconIndex, uint uIconFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_Shell_GetCachedImageIndexW' -Namespace Win32 -PassThru
# $api::Shell_GetCachedImageIndexW(pszIconPath, iIconIndex, uIconFlags)

#uselib "SHELL32.dll"
#func global Shell_GetCachedImageIndexW "Shell_GetCachedImageIndexW" wptr, wptr, wptr
; Shell_GetCachedImageIndexW pszIconPath, iIconIndex, uIconFlags   ; 戻り値は stat
; pszIconPath : LPCWSTR -> "wptr"
; iIconIndex : INT -> "wptr"
; uIconFlags : DWORD -> "wptr"
; ※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 Shell_GetCachedImageIndexW "Shell_GetCachedImageIndexW" wstr, int, int
; res = Shell_GetCachedImageIndexW(pszIconPath, iIconIndex, uIconFlags)
; pszIconPath : LPCWSTR -> "wstr"
; iIconIndex : INT -> "int"
; uIconFlags : DWORD -> "int"

; INT Shell_GetCachedImageIndexW(LPCWSTR pszIconPath, INT iIconIndex, DWORD uIconFlags)
#uselib "SHELL32.dll"
#cfunc global Shell_GetCachedImageIndexW "Shell_GetCachedImageIndexW" wstr, int, int
; res = Shell_GetCachedImageIndexW(pszIconPath, iIconIndex, uIconFlags)
; pszIconPath : LPCWSTR -> "wstr"
; iIconIndex : INT -> "int"
; uIconFlags : DWORD -> "int"

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

var (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procShell_GetCachedImageIndexW = shell32.NewProc("Shell_GetCachedImageIndexW")
)

// pszIconPath (LPCWSTR), iIconIndex (INT), uIconFlags (DWORD)
r1, _, err := procShell_GetCachedImageIndexW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszIconPath))),
	uintptr(iIconIndex),
	uintptr(uIconFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function Shell_GetCachedImageIndexW(
  pszIconPath: PWideChar;   // LPCWSTR
  iIconIndex: Integer;   // INT
  uIconFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'SHELL32.dll' name 'Shell_GetCachedImageIndexW';

result := DllCall("SHELL32\Shell_GetCachedImageIndexW"
    , "WStr", pszIconPath   ; LPCWSTR
    , "Int", iIconIndex   ; INT
    , "UInt", uIconFlags   ; DWORD
    , "Int")   ; return: INT

●Shell_GetCachedImageIndexW(pszIconPath, iIconIndex, uIconFlags) = DLL("SHELL32.dll", "int Shell_GetCachedImageIndexW(char*, int, dword)")
# 呼び出し: Shell_GetCachedImageIndexW(pszIconPath, iIconIndex, uIconFlags)
# pszIconPath : LPCWSTR -> "char*"
# iIconIndex : INT -> "int"
# uIconFlags : DWORD -> "dword"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。