AssocQueryStringW

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

HRESULT AssocQueryStringW(
    ASSOCF flags,
    ASSOCSTR str,
    LPCWSTR pszAssoc,
    LPCWSTR pszExtra,   // optional
    LPWSTR pszOut,   // optional
    DWORD* pcchOut
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function AssocQueryStringW(
    flags As UInteger,   ' ASSOCF
    str As Integer,   ' ASSOCSTR
    <MarshalAs(UnmanagedType.LPWStr)> pszAssoc As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> pszExtra As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pszOut As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pcchOut As UInteger   ' DWORD* in/out
) As Integer
End Function

' flags : ASSOCF
' str : ASSOCSTR
' pszAssoc : LPCWSTR
' pszExtra : LPCWSTR optional
' pszOut : LPWSTR optional, out
' pcchOut : DWORD* in/out
Declare PtrSafe Function AssocQueryStringW Lib "shlwapi" ( _
    ByVal flags As Long, _
    ByVal str As Long, _
    ByVal pszAssoc As LongPtr, _
    ByVal pszExtra As LongPtr, _
    ByVal pszOut As LongPtr, _
    ByRef pcchOut 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

AssocQueryStringW = ctypes.windll.shlwapi.AssocQueryStringW
AssocQueryStringW.restype = ctypes.c_int
AssocQueryStringW.argtypes = [
    wintypes.DWORD,  # flags : ASSOCF
    ctypes.c_int,  # str : ASSOCSTR
    wintypes.LPCWSTR,  # pszAssoc : LPCWSTR
    wintypes.LPCWSTR,  # pszExtra : LPCWSTR optional
    wintypes.LPWSTR,  # pszOut : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchOut : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
AssocQueryStringW = Fiddle::Function.new(
  lib['AssocQueryStringW'],
  [
    -Fiddle::TYPE_INT,  # flags : ASSOCF
    Fiddle::TYPE_INT,  # str : ASSOCSTR
    Fiddle::TYPE_VOIDP,  # pszAssoc : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pszExtra : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pszOut : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchOut : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shlwapi")]
extern "system" {
    fn AssocQueryStringW(
        flags: u32,  // ASSOCF
        str: i32,  // ASSOCSTR
        pszAssoc: *const u16,  // LPCWSTR
        pszExtra: *const u16,  // LPCWSTR optional
        pszOut: *mut u16,  // LPWSTR optional, out
        pcchOut: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "SHLWAPI.dll"
#func global AssocQueryStringW "AssocQueryStringW" wptr, wptr, wptr, wptr, wptr, wptr
; AssocQueryStringW flags, str, pszAssoc, pszExtra, varptr(pszOut), varptr(pcchOut)   ; 戻り値は stat
; flags : ASSOCF -> "wptr"
; str : ASSOCSTR -> "wptr"
; pszAssoc : LPCWSTR -> "wptr"
; pszExtra : LPCWSTR optional -> "wptr"
; pszOut : LPWSTR optional, out -> "wptr"
; pcchOut : DWORD* in/out -> "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 AssocQueryStringW "AssocQueryStringW" int, int, wstr, wstr, var, var
; res = AssocQueryStringW(flags, str, pszAssoc, pszExtra, pszOut, pcchOut)
; flags : ASSOCF -> "int"
; str : ASSOCSTR -> "int"
; pszAssoc : LPCWSTR -> "wstr"
; pszExtra : LPCWSTR optional -> "wstr"
; pszOut : LPWSTR optional, out -> "var"
; pcchOut : DWORD* in/out -> "var"
; ※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 AssocQueryStringW(ASSOCF flags, ASSOCSTR str, LPCWSTR pszAssoc, LPCWSTR pszExtra, LPWSTR pszOut, DWORD* pcchOut)
#uselib "SHLWAPI.dll"
#cfunc global AssocQueryStringW "AssocQueryStringW" int, int, wstr, wstr, var, var
; res = AssocQueryStringW(flags, str, pszAssoc, pszExtra, pszOut, pcchOut)
; flags : ASSOCF -> "int"
; str : ASSOCSTR -> "int"
; pszAssoc : LPCWSTR -> "wstr"
; pszExtra : LPCWSTR optional -> "wstr"
; pszOut : LPWSTR optional, out -> "var"
; pcchOut : DWORD* in/out -> "var"
; ※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")
	procAssocQueryStringW = shlwapi.NewProc("AssocQueryStringW")
)

// flags (ASSOCF), str (ASSOCSTR), pszAssoc (LPCWSTR), pszExtra (LPCWSTR optional), pszOut (LPWSTR optional, out), pcchOut (DWORD* in/out)
r1, _, err := procAssocQueryStringW.Call(
	uintptr(flags),
	uintptr(str),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszAssoc))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszExtra))),
	uintptr(pszOut),
	uintptr(pcchOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function AssocQueryStringW(
  flags: DWORD;   // ASSOCF
  str: Integer;   // ASSOCSTR
  pszAssoc: PWideChar;   // LPCWSTR
  pszExtra: PWideChar;   // LPCWSTR optional
  pszOut: PWideChar;   // LPWSTR optional, out
  pcchOut: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'SHLWAPI.dll' name 'AssocQueryStringW';

result := DllCall("SHLWAPI\AssocQueryStringW"
    , "UInt", flags   ; ASSOCF
    , "Int", str   ; ASSOCSTR
    , "WStr", pszAssoc   ; LPCWSTR
    , "WStr", pszExtra   ; LPCWSTR optional
    , "Ptr", pszOut   ; LPWSTR optional, out
    , "Ptr", pcchOut   ; DWORD* in/out
    , "Int")   ; return: HRESULT

●AssocQueryStringW(flags, str, pszAssoc, pszExtra, pszOut, pcchOut) = DLL("SHLWAPI.dll", "int AssocQueryStringW(dword, int, char*, char*, char*, void*)")
# 呼び出し: AssocQueryStringW(flags, str, pszAssoc, pszExtra, pszOut, pcchOut)
# flags : ASSOCF -> "dword"
# str : ASSOCSTR -> "int"
# pszAssoc : LPCWSTR -> "char*"
# pszExtra : LPCWSTR optional -> "char*"
# pszOut : LPWSTR optional, out -> "char*"
# pcchOut : DWORD* in/out -> "void*"
# 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。