GetModuleFileNameA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

DWORD GetModuleFileNameA(
    HMODULE hModule,   // optional
    LPSTR lpFilename,
    DWORD nSize
);

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

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

GetModuleFileNameA = ctypes.windll.kernel32.GetModuleFileNameA
GetModuleFileNameA.restype = wintypes.DWORD
GetModuleFileNameA.argtypes = [
    wintypes.HANDLE,  # hModule : HMODULE optional
    wintypes.LPSTR,  # lpFilename : LPSTR 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')
GetModuleFileNameA = Fiddle::Function.new(
  lib['GetModuleFileNameA'],
  [
    Fiddle::TYPE_VOIDP,  # hModule : HMODULE optional
    Fiddle::TYPE_VOIDP,  # lpFilename : LPSTR out
    -Fiddle::TYPE_INT,  # nSize : DWORD
  ],
  -Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetModuleFileNameA(
        hModule: *mut core::ffi::c_void,  // HMODULE optional
        lpFilename: *mut u8,  // LPSTR out
        nSize: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern uint GetModuleFileNameA(IntPtr hModule, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpFilename, uint nSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetModuleFileNameA' -Namespace Win32 -PassThru
# $api::GetModuleFileNameA(hModule, lpFilename, nSize)

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

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

function GetModuleFileNameA(
  hModule: THandle;   // HMODULE optional
  lpFilename: PAnsiChar;   // LPSTR out
  nSize: DWORD   // DWORD
): DWORD; stdcall;
  external 'KERNEL32.dll' name 'GetModuleFileNameA';

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

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