PathCreateFromUrlA

// SHLWAPI.dll  (ANSI / -A)
#include <windows.h>

HRESULT PathCreateFromUrlA(
    LPCSTR pszUrl,
    LPSTR pszPath,
    DWORD* pcchPath,
    DWORD dwFlags
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function PathCreateFromUrlA(
    <MarshalAs(UnmanagedType.LPStr)> pszUrl As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> pszPath As System.Text.StringBuilder,   ' LPSTR out
    ByRef pcchPath As UInteger,   ' DWORD* in/out
    dwFlags As UInteger   ' DWORD
) As Integer
End Function

' pszUrl : LPCSTR
' pszPath : LPSTR out
' pcchPath : DWORD* in/out
' dwFlags : DWORD
Declare PtrSafe Function PathCreateFromUrlA Lib "shlwapi" ( _
    ByVal pszUrl As String, _
    ByVal pszPath As String, _
    ByRef pcchPath As Long, _
    ByVal dwFlags As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

PathCreateFromUrlA = ctypes.windll.shlwapi.PathCreateFromUrlA
PathCreateFromUrlA.restype = ctypes.c_int
PathCreateFromUrlA.argtypes = [
    wintypes.LPCSTR,  # pszUrl : LPCSTR
    wintypes.LPSTR,  # pszPath : LPSTR out
    ctypes.POINTER(wintypes.DWORD),  # pcchPath : DWORD* in/out
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
PathCreateFromUrlA = Fiddle::Function.new(
  lib['PathCreateFromUrlA'],
  [
    Fiddle::TYPE_VOIDP,  # pszUrl : LPCSTR
    Fiddle::TYPE_VOIDP,  # pszPath : LPSTR out
    Fiddle::TYPE_VOIDP,  # pcchPath : DWORD* in/out
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "shlwapi")]
extern "system" {
    fn PathCreateFromUrlA(
        pszUrl: *const u8,  // LPCSTR
        pszPath: *mut u8,  // LPSTR out
        pcchPath: *mut u32,  // DWORD* in/out
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Ansi)]
public static extern int PathCreateFromUrlA([MarshalAs(UnmanagedType.LPStr)] string pszUrl, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pszPath, ref uint pcchPath, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_PathCreateFromUrlA' -Namespace Win32 -PassThru
# $api::PathCreateFromUrlA(pszUrl, pszPath, pcchPath, dwFlags)

#uselib "SHLWAPI.dll"
#func global PathCreateFromUrlA "PathCreateFromUrlA" sptr, sptr, sptr, sptr
; PathCreateFromUrlA pszUrl, varptr(pszPath), varptr(pcchPath), dwFlags   ; 戻り値は stat
; pszUrl : LPCSTR -> "sptr"
; pszPath : LPSTR out -> "sptr"
; pcchPath : DWORD* in/out -> "sptr"
; dwFlags : DWORD -> "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 "SHLWAPI.dll"
#cfunc global PathCreateFromUrlA "PathCreateFromUrlA" str, var, var, int
; res = PathCreateFromUrlA(pszUrl, pszPath, pcchPath, dwFlags)
; pszUrl : LPCSTR -> "str"
; pszPath : LPSTR out -> "var"
; pcchPath : DWORD* in/out -> "var"
; 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 PathCreateFromUrlA(LPCSTR pszUrl, LPSTR pszPath, DWORD* pcchPath, DWORD dwFlags)
#uselib "SHLWAPI.dll"
#cfunc global PathCreateFromUrlA "PathCreateFromUrlA" str, var, var, int
; res = PathCreateFromUrlA(pszUrl, pszPath, pcchPath, dwFlags)
; pszUrl : LPCSTR -> "str"
; pszPath : LPSTR out -> "var"
; pcchPath : DWORD* in/out -> "var"
; 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")
	procPathCreateFromUrlA = shlwapi.NewProc("PathCreateFromUrlA")
)

// pszUrl (LPCSTR), pszPath (LPSTR out), pcchPath (DWORD* in/out), dwFlags (DWORD)
r1, _, err := procPathCreateFromUrlA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszUrl))),
	uintptr(pszPath),
	uintptr(pcchPath),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function PathCreateFromUrlA(
  pszUrl: PAnsiChar;   // LPCSTR
  pszPath: PAnsiChar;   // LPSTR out
  pcchPath: Pointer;   // DWORD* in/out
  dwFlags: DWORD   // DWORD
): Integer; stdcall;
  external 'SHLWAPI.dll' name 'PathCreateFromUrlA';

result := DllCall("SHLWAPI\PathCreateFromUrlA"
    , "AStr", pszUrl   ; LPCSTR
    , "Ptr", pszPath   ; LPSTR out
    , "Ptr", pcchPath   ; DWORD* in/out
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: HRESULT

●PathCreateFromUrlA(pszUrl, pszPath, pcchPath, dwFlags) = DLL("SHLWAPI.dll", "int PathCreateFromUrlA(char*, char*, void*, dword)")
# 呼び出し: PathCreateFromUrlA(pszUrl, pszPath, pcchPath, dwFlags)
# pszUrl : LPCSTR -> "char*"
# pszPath : LPSTR out -> "char*"
# pcchPath : DWORD* in/out -> "void*"
# 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)。