SymGetSearchPathW

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

BOOL SymGetSearchPathW(
    HANDLE hProcess,
    LPWSTR SearchPathA,
    DWORD SearchPathLength
);

<DllImport("dbghelp.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SymGetSearchPathW(
    hProcess As IntPtr,   ' HANDLE
    <MarshalAs(UnmanagedType.LPWStr)> SearchPathA As System.Text.StringBuilder,   ' LPWSTR out
    SearchPathLength As UInteger   ' DWORD
) As Boolean
End Function

' hProcess : HANDLE
' SearchPathA : LPWSTR out
' SearchPathLength : DWORD
Declare PtrSafe Function SymGetSearchPathW Lib "dbghelp" ( _
    ByVal hProcess As LongPtr, _
    ByVal SearchPathA As LongPtr, _
    ByVal SearchPathLength 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

SymGetSearchPathW = ctypes.windll.dbghelp.SymGetSearchPathW
SymGetSearchPathW.restype = wintypes.BOOL
SymGetSearchPathW.argtypes = [
    wintypes.HANDLE,  # hProcess : HANDLE
    wintypes.LPWSTR,  # SearchPathA : LPWSTR out
    wintypes.DWORD,  # SearchPathLength : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dbghelp.dll')
SymGetSearchPathW = Fiddle::Function.new(
  lib['SymGetSearchPathW'],
  [
    Fiddle::TYPE_VOIDP,  # hProcess : HANDLE
    Fiddle::TYPE_VOIDP,  # SearchPathA : LPWSTR out
    -Fiddle::TYPE_INT,  # SearchPathLength : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "dbghelp")]
extern "system" {
    fn SymGetSearchPathW(
        hProcess: *mut core::ffi::c_void,  // HANDLE
        SearchPathA: *mut u16,  // LPWSTR out
        SearchPathLength: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("dbghelp.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool SymGetSearchPathW(IntPtr hProcess, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder SearchPathA, uint SearchPathLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dbghelp_SymGetSearchPathW' -Namespace Win32 -PassThru
# $api::SymGetSearchPathW(hProcess, SearchPathA, SearchPathLength)

#uselib "dbghelp.dll"
#func global SymGetSearchPathW "SymGetSearchPathW" wptr, wptr, wptr
; SymGetSearchPathW hProcess, varptr(SearchPathA), SearchPathLength   ; 戻り値は stat
; hProcess : HANDLE -> "wptr"
; SearchPathA : LPWSTR out -> "wptr"
; SearchPathLength : 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 "dbghelp.dll"
#cfunc global SymGetSearchPathW "SymGetSearchPathW" sptr, var, int
; res = SymGetSearchPathW(hProcess, SearchPathA, SearchPathLength)
; hProcess : HANDLE -> "sptr"
; SearchPathA : LPWSTR out -> "var"
; SearchPathLength : 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。

; BOOL SymGetSearchPathW(HANDLE hProcess, LPWSTR SearchPathA, DWORD SearchPathLength)
#uselib "dbghelp.dll"
#cfunc global SymGetSearchPathW "SymGetSearchPathW" intptr, var, int
; res = SymGetSearchPathW(hProcess, SearchPathA, SearchPathLength)
; hProcess : HANDLE -> "intptr"
; SearchPathA : LPWSTR out -> "var"
; SearchPathLength : 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 (
	dbghelp = windows.NewLazySystemDLL("dbghelp.dll")
	procSymGetSearchPathW = dbghelp.NewProc("SymGetSearchPathW")
)

// hProcess (HANDLE), SearchPathA (LPWSTR out), SearchPathLength (DWORD)
r1, _, err := procSymGetSearchPathW.Call(
	uintptr(hProcess),
	uintptr(SearchPathA),
	uintptr(SearchPathLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SymGetSearchPathW(
  hProcess: THandle;   // HANDLE
  SearchPathA: PWideChar;   // LPWSTR out
  SearchPathLength: DWORD   // DWORD
): BOOL; stdcall;
  external 'dbghelp.dll' name 'SymGetSearchPathW';

result := DllCall("dbghelp\SymGetSearchPathW"
    , "Ptr", hProcess   ; HANDLE
    , "Ptr", SearchPathA   ; LPWSTR out
    , "UInt", SearchPathLength   ; DWORD
    , "Int")   ; return: BOOL

●SymGetSearchPathW(hProcess, SearchPathA, SearchPathLength) = DLL("dbghelp.dll", "bool SymGetSearchPathW(void*, char*, dword)")
# 呼び出し: SymGetSearchPathW(hProcess, SearchPathA, SearchPathLength)
# hProcess : HANDLE -> "void*"
# SearchPathA : LPWSTR out -> "char*"
# SearchPathLength : 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。