SymGetHomeDirectoryW

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

LPWSTR SymGetHomeDirectoryW(
    DWORD type,
    LPWSTR dir,
    UINT_PTR size
);

<DllImport("dbghelp.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SymGetHomeDirectoryW(
    type As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> dir As System.Text.StringBuilder,   ' LPWSTR out
    size As UIntPtr   ' UINT_PTR
) As IntPtr
End Function

' type : DWORD
' dir : LPWSTR out
' size : UINT_PTR
Declare PtrSafe Function SymGetHomeDirectoryW Lib "dbghelp" ( _
    ByVal type As Long, _
    ByVal dir As LongPtr, _
    ByVal size As LongPtr) As LongPtr
' 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

SymGetHomeDirectoryW = ctypes.windll.dbghelp.SymGetHomeDirectoryW
SymGetHomeDirectoryW.restype = wintypes.LPWSTR
SymGetHomeDirectoryW.argtypes = [
    wintypes.DWORD,  # type : DWORD
    wintypes.LPWSTR,  # dir : LPWSTR out
    ctypes.c_size_t,  # size : UINT_PTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dbghelp.dll')
SymGetHomeDirectoryW = Fiddle::Function.new(
  lib['SymGetHomeDirectoryW'],
  [
    -Fiddle::TYPE_INT,  # type : DWORD
    Fiddle::TYPE_VOIDP,  # dir : LPWSTR out
    Fiddle::TYPE_UINTPTR_T,  # size : UINT_PTR
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "dbghelp")]
extern "system" {
    fn SymGetHomeDirectoryW(
        type: u32,  // DWORD
        dir: *mut u16,  // LPWSTR out
        size: usize  // UINT_PTR
    ) -> *mut u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dbghelp.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr SymGetHomeDirectoryW(uint type, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder dir, UIntPtr size);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dbghelp_SymGetHomeDirectoryW' -Namespace Win32 -PassThru
# $api::SymGetHomeDirectoryW(type, dir, size)

#uselib "dbghelp.dll"
#func global SymGetHomeDirectoryW "SymGetHomeDirectoryW" wptr, wptr, wptr
; SymGetHomeDirectoryW type, varptr(dir), size   ; 戻り値は stat
; type : DWORD -> "wptr"
; dir : LPWSTR out -> "wptr"
; size : UINT_PTR -> "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 "dbghelp.dll"
#cfunc global SymGetHomeDirectoryW "SymGetHomeDirectoryW" int, var, sptr
; res = SymGetHomeDirectoryW(type, dir, size)
; type : DWORD -> "int"
; dir : LPWSTR out -> "var"
; size : UINT_PTR -> "sptr"
; ※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。

; LPWSTR SymGetHomeDirectoryW(DWORD type, LPWSTR dir, UINT_PTR size)
#uselib "dbghelp.dll"
#cfunc global SymGetHomeDirectoryW "SymGetHomeDirectoryW" int, var, intptr
; res = SymGetHomeDirectoryW(type, dir, size)
; type : DWORD -> "int"
; dir : LPWSTR out -> "var"
; size : UINT_PTR -> "intptr"
; ※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 (
	dbghelp = windows.NewLazySystemDLL("dbghelp.dll")
	procSymGetHomeDirectoryW = dbghelp.NewProc("SymGetHomeDirectoryW")
)

// type (DWORD), dir (LPWSTR out), size (UINT_PTR)
r1, _, err := procSymGetHomeDirectoryW.Call(
	uintptr(type),
	uintptr(dir),
	uintptr(size),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPWSTR

function SymGetHomeDirectoryW(
  type: DWORD;   // DWORD
  dir: PWideChar;   // LPWSTR out
  size: NativeUInt   // UINT_PTR
): PWideChar; stdcall;
  external 'dbghelp.dll' name 'SymGetHomeDirectoryW';

result := DllCall("dbghelp\SymGetHomeDirectoryW"
    , "UInt", type   ; DWORD
    , "Ptr", dir   ; LPWSTR out
    , "UPtr", size   ; UINT_PTR
    , "Ptr")   ; return: LPWSTR

●SymGetHomeDirectoryW(type, dir, size) = DLL("dbghelp.dll", "char* SymGetHomeDirectoryW(dword, char*, int)")
# 呼び出し: SymGetHomeDirectoryW(type, dir, size)
# type : DWORD -> "dword"
# dir : LPWSTR out -> "char*"
# size : UINT_PTR -> "int"
# 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。