SymSetHomeDirectory

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

LPSTR SymSetHomeDirectory(
    HANDLE hProcess,   // optional
    LPCSTR dir   // optional
);

<DllImport("dbghelp.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SymSetHomeDirectory(
    hProcess As IntPtr,   ' HANDLE optional
    <MarshalAs(UnmanagedType.LPStr)> dir As String   ' LPCSTR optional
) As IntPtr
End Function

' hProcess : HANDLE optional
' dir : LPCSTR optional
Declare PtrSafe Function SymSetHomeDirectory Lib "dbghelp" ( _
    ByVal hProcess As LongPtr, _
    ByVal dir As String) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SymSetHomeDirectory = ctypes.windll.dbghelp.SymSetHomeDirectory
SymSetHomeDirectory.restype = wintypes.LPSTR
SymSetHomeDirectory.argtypes = [
    wintypes.HANDLE,  # hProcess : HANDLE optional
    wintypes.LPCSTR,  # dir : LPCSTR optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dbghelp.dll')
SymSetHomeDirectory = Fiddle::Function.new(
  lib['SymSetHomeDirectory'],
  [
    Fiddle::TYPE_VOIDP,  # hProcess : HANDLE optional
    Fiddle::TYPE_VOIDP,  # dir : LPCSTR optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "dbghelp")]
extern "system" {
    fn SymSetHomeDirectory(
        hProcess: *mut core::ffi::c_void,  // HANDLE optional
        dir: *const u8  // LPCSTR optional
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dbghelp.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern IntPtr SymSetHomeDirectory(IntPtr hProcess, [MarshalAs(UnmanagedType.LPStr)] string dir);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dbghelp_SymSetHomeDirectory' -Namespace Win32 -PassThru
# $api::SymSetHomeDirectory(hProcess, dir)

#uselib "dbghelp.dll"
#func global SymSetHomeDirectory "SymSetHomeDirectory" sptr, sptr
; SymSetHomeDirectory hProcess, dir   ; 戻り値は stat
; hProcess : HANDLE optional -> "sptr"
; dir : LPCSTR optional -> "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 "dbghelp.dll"
#cfunc global SymSetHomeDirectory "SymSetHomeDirectory" sptr, str
; res = SymSetHomeDirectory(hProcess, dir)
; hProcess : HANDLE optional -> "sptr"
; dir : LPCSTR optional -> "str"

; LPSTR SymSetHomeDirectory(HANDLE hProcess, LPCSTR dir)
#uselib "dbghelp.dll"
#cfunc global SymSetHomeDirectory "SymSetHomeDirectory" intptr, str
; res = SymSetHomeDirectory(hProcess, dir)
; hProcess : HANDLE optional -> "intptr"
; dir : LPCSTR optional -> "str"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	dbghelp = windows.NewLazySystemDLL("dbghelp.dll")
	procSymSetHomeDirectory = dbghelp.NewProc("SymSetHomeDirectory")
)

// hProcess (HANDLE optional), dir (LPCSTR optional)
r1, _, err := procSymSetHomeDirectory.Call(
	uintptr(hProcess),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(dir))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function SymSetHomeDirectory(
  hProcess: THandle;   // HANDLE optional
  dir: PAnsiChar   // LPCSTR optional
): PAnsiChar; stdcall;
  external 'dbghelp.dll' name 'SymSetHomeDirectory';

result := DllCall("dbghelp\SymSetHomeDirectory"
    , "Ptr", hProcess   ; HANDLE optional
    , "AStr", dir   ; LPCSTR optional
    , "Ptr")   ; return: LPSTR

●SymSetHomeDirectory(hProcess, dir) = DLL("dbghelp.dll", "char* SymSetHomeDirectory(void*, char*)")
# 呼び出し: SymSetHomeDirectory(hProcess, dir)
# hProcess : HANDLE optional -> "void*"
# dir : LPCSTR optional -> "char*"
# 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)。