UrlGetPartW

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

HRESULT UrlGetPartW(
    LPCWSTR pszIn,
    LPWSTR pszOut,
    DWORD* pcchOut,
    DWORD dwPart,
    DWORD dwFlags
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function UrlGetPartW(
    <MarshalAs(UnmanagedType.LPWStr)> pszIn As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> pszOut As System.Text.StringBuilder,   ' LPWSTR out
    ByRef pcchOut As UInteger,   ' DWORD* in/out
    dwPart As UInteger,   ' DWORD
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' pszIn : LPCWSTR
' pszOut : LPWSTR out
' pcchOut : DWORD* in/out
' dwPart : DWORD
' dwFlags : DWORD
Declare PtrSafe Function UrlGetPartW Lib "shlwapi" ( _
    ByVal pszIn As LongPtr, _
    ByVal pszOut As LongPtr, _
    ByRef pcchOut As Long, _
    ByVal dwPart As Long, _
    ByVal dwFlags 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

UrlGetPartW = ctypes.windll.shlwapi.UrlGetPartW
UrlGetPartW.restype = ctypes.c_int
UrlGetPartW.argtypes = [
    wintypes.LPCWSTR,  # pszIn : LPCWSTR
    wintypes.LPWSTR,  # pszOut : LPWSTR out
    ctypes.POINTER(wintypes.DWORD),  # pcchOut : DWORD* in/out
    wintypes.DWORD,  # dwPart : DWORD
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
UrlGetPartW = Fiddle::Function.new(
  lib['UrlGetPartW'],
  [
    Fiddle::TYPE_VOIDP,  # pszIn : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pszOut : LPWSTR out
    Fiddle::TYPE_VOIDP,  # pcchOut : DWORD* in/out
    -Fiddle::TYPE_INT,  # dwPart : DWORD
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shlwapi")]
extern "system" {
    fn UrlGetPartW(
        pszIn: *const u16,  // LPCWSTR
        pszOut: *mut u16,  // LPWSTR out
        pcchOut: *mut u32,  // DWORD* in/out
        dwPart: u32,  // DWORD
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Unicode)]
public static extern int UrlGetPartW([MarshalAs(UnmanagedType.LPWStr)] string pszIn, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszOut, ref uint pcchOut, uint dwPart, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_UrlGetPartW' -Namespace Win32 -PassThru
# $api::UrlGetPartW(pszIn, pszOut, pcchOut, dwPart, dwFlags)

#uselib "SHLWAPI.dll"
#func global UrlGetPartW "UrlGetPartW" wptr, wptr, wptr, wptr, wptr
; UrlGetPartW pszIn, varptr(pszOut), varptr(pcchOut), dwPart, dwFlags   ; 戻り値は stat
; pszIn : LPCWSTR -> "wptr"
; pszOut : LPWSTR out -> "wptr"
; pcchOut : DWORD* in/out -> "wptr"
; dwPart : DWORD -> "wptr"
; dwFlags : 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 "SHLWAPI.dll"
#cfunc global UrlGetPartW "UrlGetPartW" wstr, var, var, int, int
; res = UrlGetPartW(pszIn, pszOut, pcchOut, dwPart, dwFlags)
; pszIn : LPCWSTR -> "wstr"
; pszOut : LPWSTR out -> "var"
; pcchOut : DWORD* in/out -> "var"
; dwPart : DWORD -> "int"
; dwFlags : DWORD -> "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。

; HRESULT UrlGetPartW(LPCWSTR pszIn, LPWSTR pszOut, DWORD* pcchOut, DWORD dwPart, DWORD dwFlags)
#uselib "SHLWAPI.dll"
#cfunc global UrlGetPartW "UrlGetPartW" wstr, var, var, int, int
; res = UrlGetPartW(pszIn, pszOut, pcchOut, dwPart, dwFlags)
; pszIn : LPCWSTR -> "wstr"
; pszOut : LPWSTR out -> "var"
; pcchOut : DWORD* in/out -> "var"
; dwPart : DWORD -> "int"
; dwFlags : DWORD -> "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 (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procUrlGetPartW = shlwapi.NewProc("UrlGetPartW")
)

// pszIn (LPCWSTR), pszOut (LPWSTR out), pcchOut (DWORD* in/out), dwPart (DWORD), dwFlags (DWORD)
r1, _, err := procUrlGetPartW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszIn))),
	uintptr(pszOut),
	uintptr(pcchOut),
	uintptr(dwPart),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function UrlGetPartW(
  pszIn: PWideChar;   // LPCWSTR
  pszOut: PWideChar;   // LPWSTR out
  pcchOut: Pointer;   // DWORD* in/out
  dwPart: DWORD;   // DWORD
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'SHLWAPI.dll' name 'UrlGetPartW';

result := DllCall("SHLWAPI\UrlGetPartW"
    , "WStr", pszIn   ; LPCWSTR
    , "Ptr", pszOut   ; LPWSTR out
    , "Ptr", pcchOut   ; DWORD* in/out
    , "UInt", dwPart   ; DWORD
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: HRESULT

●UrlGetPartW(pszIn, pszOut, pcchOut, dwPart, dwFlags) = DLL("SHLWAPI.dll", "int UrlGetPartW(char*, char*, void*, dword, dword)")
# 呼び出し: UrlGetPartW(pszIn, pszOut, pcchOut, dwPart, dwFlags)
# pszIn : LPCWSTR -> "char*"
# pszOut : LPWSTR out -> "char*"
# pcchOut : DWORD* in/out -> "void*"
# dwPart : DWORD -> "dword"
# dwFlags : 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。