GetModuleFileNameW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

DWORD GetModuleFileNameW(
    HMODULE hModule,   // optional
    LPWSTR lpFilename,
    DWORD nSize
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetModuleFileNameW(
    hModule As IntPtr,   ' HMODULE optional
    <MarshalAs(UnmanagedType.LPWStr)> lpFilename As System.Text.StringBuilder,   ' LPWSTR out
    nSize As UInteger   ' DWORD
) As UInteger
End Function

' hModule : HMODULE optional
' lpFilename : LPWSTR out
' nSize : DWORD
Declare PtrSafe Function GetModuleFileNameW Lib "kernel32" ( _
    ByVal hModule As LongPtr, _
    ByVal lpFilename As LongPtr, _
    ByVal nSize 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

GetModuleFileNameW = ctypes.windll.kernel32.GetModuleFileNameW
GetModuleFileNameW.restype = wintypes.DWORD
GetModuleFileNameW.argtypes = [
    wintypes.HANDLE,  # hModule : HMODULE optional
    wintypes.LPWSTR,  # lpFilename : LPWSTR out
    wintypes.DWORD,  # nSize : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetModuleFileNameW = Fiddle::Function.new(
  lib['GetModuleFileNameW'],
  [
    Fiddle::TYPE_VOIDP,  # hModule : HMODULE optional
    Fiddle::TYPE_VOIDP,  # lpFilename : LPWSTR out
    -Fiddle::TYPE_INT,  # nSize : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn GetModuleFileNameW(
        hModule: *mut core::ffi::c_void,  // HMODULE optional
        lpFilename: *mut u16,  // LPWSTR out
        nSize: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern uint GetModuleFileNameW(IntPtr hModule, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpFilename, uint nSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetModuleFileNameW' -Namespace Win32 -PassThru
# $api::GetModuleFileNameW(hModule, lpFilename, nSize)

#uselib "KERNEL32.dll"
#func global GetModuleFileNameW "GetModuleFileNameW" wptr, wptr, wptr
; GetModuleFileNameW hModule, varptr(lpFilename), nSize   ; 戻り値は stat
; hModule : HMODULE optional -> "wptr"
; lpFilename : LPWSTR out -> "wptr"
; nSize : 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 "KERNEL32.dll"
#cfunc global GetModuleFileNameW "GetModuleFileNameW" sptr, var, int
; res = GetModuleFileNameW(hModule, lpFilename, nSize)
; hModule : HMODULE optional -> "sptr"
; lpFilename : LPWSTR out -> "var"
; nSize : 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 GetModuleFileNameW(HMODULE hModule, LPWSTR lpFilename, DWORD nSize)
#uselib "KERNEL32.dll"
#cfunc global GetModuleFileNameW "GetModuleFileNameW" intptr, var, int
; res = GetModuleFileNameW(hModule, lpFilename, nSize)
; hModule : HMODULE optional -> "intptr"
; lpFilename : LPWSTR out -> "var"
; nSize : 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetModuleFileNameW = kernel32.NewProc("GetModuleFileNameW")
)

// hModule (HMODULE optional), lpFilename (LPWSTR out), nSize (DWORD)
r1, _, err := procGetModuleFileNameW.Call(
	uintptr(hModule),
	uintptr(lpFilename),
	uintptr(nSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetModuleFileNameW(
  hModule: THandle;   // HMODULE optional
  lpFilename: PWideChar;   // LPWSTR out
  nSize: DWORD   // DWORD
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetModuleFileNameW';

result := DllCall("KERNEL32\GetModuleFileNameW"
    , "Ptr", hModule   ; HMODULE optional
    , "Ptr", lpFilename   ; LPWSTR out
    , "UInt", nSize   ; DWORD
    , "UInt")   ; return: DWORD

●GetModuleFileNameW(hModule, lpFilename, nSize) = DLL("KERNEL32.dll", "dword GetModuleFileNameW(void*, char*, dword)")
# 呼び出し: GetModuleFileNameW(hModule, lpFilename, nSize)
# hModule : HMODULE optional -> "void*"
# lpFilename : LPWSTR out -> "char*"
# nSize : 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。