SymUnDName

// dbghelp.dll
#include <windows.h>

BOOL SymUnDName(
    IMAGEHLP_SYMBOL* sym,
    LPSTR UnDecName,
    DWORD UnDecNameLength
);

<DllImport("dbghelp.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SymUnDName(
    sym As IntPtr,   ' IMAGEHLP_SYMBOL*
    <MarshalAs(UnmanagedType.LPStr)> UnDecName As System.Text.StringBuilder,   ' LPSTR out
    UnDecNameLength As UInteger   ' DWORD
) As Boolean
End Function

' sym : IMAGEHLP_SYMBOL*
' UnDecName : LPSTR out
' UnDecNameLength : DWORD
Declare PtrSafe Function SymUnDName Lib "dbghelp" ( _
    ByVal sym As LongPtr, _
    ByVal UnDecName As String, _
    ByVal UnDecNameLength 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

SymUnDName = ctypes.windll.dbghelp.SymUnDName
SymUnDName.restype = wintypes.BOOL
SymUnDName.argtypes = [
    ctypes.c_void_p,  # sym : IMAGEHLP_SYMBOL*
    wintypes.LPSTR,  # UnDecName : LPSTR out
    wintypes.DWORD,  # UnDecNameLength : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dbghelp.dll')
SymUnDName = Fiddle::Function.new(
  lib['SymUnDName'],
  [
    Fiddle::TYPE_VOIDP,  # sym : IMAGEHLP_SYMBOL*
    Fiddle::TYPE_VOIDP,  # UnDecName : LPSTR out
    -Fiddle::TYPE_INT,  # UnDecNameLength : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "dbghelp")]
extern "system" {
    fn SymUnDName(
        sym: *mut IMAGEHLP_SYMBOL,  // IMAGEHLP_SYMBOL*
        UnDecName: *mut u8,  // LPSTR out
        UnDecNameLength: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("dbghelp.dll", SetLastError = true)]
public static extern bool SymUnDName(IntPtr sym, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder UnDecName, uint UnDecNameLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dbghelp_SymUnDName' -Namespace Win32 -PassThru
# $api::SymUnDName(sym, UnDecName, UnDecNameLength)

#uselib "dbghelp.dll"
#func global SymUnDName "SymUnDName" sptr, sptr, sptr
; SymUnDName varptr(sym), varptr(UnDecName), UnDecNameLength   ; 戻り値は stat
; sym : IMAGEHLP_SYMBOL* -> "sptr"
; UnDecName : LPSTR out -> "sptr"
; UnDecNameLength : 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 "dbghelp.dll"
#cfunc global SymUnDName "SymUnDName" var, var, int
; res = SymUnDName(sym, UnDecName, UnDecNameLength)
; sym : IMAGEHLP_SYMBOL* -> "var"
; UnDecName : LPSTR out -> "var"
; UnDecNameLength : 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 SymUnDName(IMAGEHLP_SYMBOL* sym, LPSTR UnDecName, DWORD UnDecNameLength)
#uselib "dbghelp.dll"
#cfunc global SymUnDName "SymUnDName" var, var, int
; res = SymUnDName(sym, UnDecName, UnDecNameLength)
; sym : IMAGEHLP_SYMBOL* -> "var"
; UnDecName : LPSTR out -> "var"
; UnDecNameLength : 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")
	procSymUnDName = dbghelp.NewProc("SymUnDName")
)

// sym (IMAGEHLP_SYMBOL*), UnDecName (LPSTR out), UnDecNameLength (DWORD)
r1, _, err := procSymUnDName.Call(
	uintptr(sym),
	uintptr(UnDecName),
	uintptr(UnDecNameLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SymUnDName(
  sym: Pointer;   // IMAGEHLP_SYMBOL*
  UnDecName: PAnsiChar;   // LPSTR out
  UnDecNameLength: DWORD   // DWORD
): BOOL; stdcall;
  external 'dbghelp.dll' name 'SymUnDName';

result := DllCall("dbghelp\SymUnDName"
    , "Ptr", sym   ; IMAGEHLP_SYMBOL*
    , "Ptr", UnDecName   ; LPSTR out
    , "UInt", UnDecNameLength   ; DWORD
    , "Int")   ; return: BOOL

●SymUnDName(sym, UnDecName, UnDecNameLength) = DLL("dbghelp.dll", "bool SymUnDName(void*, char*, dword)")
# 呼び出し: SymUnDName(sym, UnDecName, UnDecNameLength)
# sym : IMAGEHLP_SYMBOL* -> "void*"
# UnDecName : LPSTR out -> "char*"
# UnDecNameLength : 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)。