GetWindowModuleFileNameW

// USER32.dll  (Unicode / -W)
#include <windows.h>

DWORD GetWindowModuleFileNameW(
    HWND hwnd,
    LPWSTR pszFileName,
    DWORD cchFileNameMax
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetWindowModuleFileNameW(
    hwnd As IntPtr,   ' HWND
    <MarshalAs(UnmanagedType.LPWStr)> pszFileName As System.Text.StringBuilder,   ' LPWSTR out
    cchFileNameMax As UInteger   ' DWORD
) As UInteger
End Function

' hwnd : HWND
' pszFileName : LPWSTR out
' cchFileNameMax : DWORD
Declare PtrSafe Function GetWindowModuleFileNameW Lib "user32" ( _
    ByVal hwnd As LongPtr, _
    ByVal pszFileName As LongPtr, _
    ByVal cchFileNameMax 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

GetWindowModuleFileNameW = ctypes.windll.user32.GetWindowModuleFileNameW
GetWindowModuleFileNameW.restype = wintypes.DWORD
GetWindowModuleFileNameW.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
    wintypes.LPWSTR,  # pszFileName : LPWSTR out
    wintypes.DWORD,  # cchFileNameMax : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetWindowModuleFileNameW = Fiddle::Function.new(
  lib['GetWindowModuleFileNameW'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
    Fiddle::TYPE_VOIDP,  # pszFileName : LPWSTR out
    -Fiddle::TYPE_INT,  # cchFileNameMax : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn GetWindowModuleFileNameW(
        hwnd: *mut core::ffi::c_void,  // HWND
        pszFileName: *mut u16,  // LPWSTR out
        cchFileNameMax: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern uint GetWindowModuleFileNameW(IntPtr hwnd, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszFileName, uint cchFileNameMax);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetWindowModuleFileNameW' -Namespace Win32 -PassThru
# $api::GetWindowModuleFileNameW(hwnd, pszFileName, cchFileNameMax)

#uselib "USER32.dll"
#func global GetWindowModuleFileNameW "GetWindowModuleFileNameW" wptr, wptr, wptr
; GetWindowModuleFileNameW hwnd, varptr(pszFileName), cchFileNameMax   ; 戻り値は stat
; hwnd : HWND -> "wptr"
; pszFileName : LPWSTR out -> "wptr"
; cchFileNameMax : 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 "USER32.dll"
#cfunc global GetWindowModuleFileNameW "GetWindowModuleFileNameW" sptr, var, int
; res = GetWindowModuleFileNameW(hwnd, pszFileName, cchFileNameMax)
; hwnd : HWND -> "sptr"
; pszFileName : LPWSTR out -> "var"
; cchFileNameMax : 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。

; DWORD GetWindowModuleFileNameW(HWND hwnd, LPWSTR pszFileName, DWORD cchFileNameMax)
#uselib "USER32.dll"
#cfunc global GetWindowModuleFileNameW "GetWindowModuleFileNameW" intptr, var, int
; res = GetWindowModuleFileNameW(hwnd, pszFileName, cchFileNameMax)
; hwnd : HWND -> "intptr"
; pszFileName : LPWSTR out -> "var"
; cchFileNameMax : 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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetWindowModuleFileNameW = user32.NewProc("GetWindowModuleFileNameW")
)

// hwnd (HWND), pszFileName (LPWSTR out), cchFileNameMax (DWORD)
r1, _, err := procGetWindowModuleFileNameW.Call(
	uintptr(hwnd),
	uintptr(pszFileName),
	uintptr(cchFileNameMax),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetWindowModuleFileNameW(
  hwnd: THandle;   // HWND
  pszFileName: PWideChar;   // LPWSTR out
  cchFileNameMax: DWORD   // DWORD
): DWORD; stdcall;
  external 'USER32.dll' name 'GetWindowModuleFileNameW';

result := DllCall("USER32\GetWindowModuleFileNameW"
    , "Ptr", hwnd   ; HWND
    , "Ptr", pszFileName   ; LPWSTR out
    , "UInt", cchFileNameMax   ; DWORD
    , "UInt")   ; return: DWORD

●GetWindowModuleFileNameW(hwnd, pszFileName, cchFileNameMax) = DLL("USER32.dll", "dword GetWindowModuleFileNameW(void*, char*, dword)")
# 呼び出し: GetWindowModuleFileNameW(hwnd, pszFileName, cchFileNameMax)
# hwnd : HWND -> "void*"
# pszFileName : LPWSTR out -> "char*"
# cchFileNameMax : 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。