UnDecorateSymbolName

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

DWORD UnDecorateSymbolName(
    LPCSTR name,
    LPSTR outputString,
    DWORD maxStringLength,
    DWORD flags
);

<DllImport("dbghelp.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function UnDecorateSymbolName(
    <MarshalAs(UnmanagedType.LPStr)> name As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> outputString As System.Text.StringBuilder,   ' LPSTR out
    maxStringLength As UInteger,   ' DWORD
    flags As UInteger   ' DWORD
) As UInteger
End Function

' name : LPCSTR
' outputString : LPSTR out
' maxStringLength : DWORD
' flags : DWORD
Declare PtrSafe Function UnDecorateSymbolName Lib "dbghelp" ( _
    ByVal name As String, _
    ByVal outputString As String, _
    ByVal maxStringLength As Long, _
    ByVal flags 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

UnDecorateSymbolName = ctypes.windll.dbghelp.UnDecorateSymbolName
UnDecorateSymbolName.restype = wintypes.DWORD
UnDecorateSymbolName.argtypes = [
    wintypes.LPCSTR,  # name : LPCSTR
    wintypes.LPSTR,  # outputString : LPSTR out
    wintypes.DWORD,  # maxStringLength : DWORD
    wintypes.DWORD,  # flags : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dbghelp.dll')
UnDecorateSymbolName = Fiddle::Function.new(
  lib['UnDecorateSymbolName'],
  [
    Fiddle::TYPE_VOIDP,  # name : LPCSTR
    Fiddle::TYPE_VOIDP,  # outputString : LPSTR out
    -Fiddle::TYPE_INT,  # maxStringLength : DWORD
    -Fiddle::TYPE_INT,  # flags : DWORD
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dbghelp")]
extern "system" {
    fn UnDecorateSymbolName(
        name: *const u8,  // LPCSTR
        outputString: *mut u8,  // LPSTR out
        maxStringLength: u32,  // DWORD
        flags: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dbghelp.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern uint UnDecorateSymbolName([MarshalAs(UnmanagedType.LPStr)] string name, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder outputString, uint maxStringLength, uint flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dbghelp_UnDecorateSymbolName' -Namespace Win32 -PassThru
# $api::UnDecorateSymbolName(name, outputString, maxStringLength, flags)

#uselib "dbghelp.dll"
#func global UnDecorateSymbolName "UnDecorateSymbolName" sptr, sptr, sptr, sptr
; UnDecorateSymbolName name, varptr(outputString), maxStringLength, flags   ; 戻り値は stat
; name : LPCSTR -> "sptr"
; outputString : LPSTR out -> "sptr"
; maxStringLength : DWORD -> "sptr"
; flags : 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 UnDecorateSymbolName "UnDecorateSymbolName" str, var, int, int
; res = UnDecorateSymbolName(name, outputString, maxStringLength, flags)
; name : LPCSTR -> "str"
; outputString : LPSTR out -> "var"
; maxStringLength : DWORD -> "int"
; flags : 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 UnDecorateSymbolName(LPCSTR name, LPSTR outputString, DWORD maxStringLength, DWORD flags)
#uselib "dbghelp.dll"
#cfunc global UnDecorateSymbolName "UnDecorateSymbolName" str, var, int, int
; res = UnDecorateSymbolName(name, outputString, maxStringLength, flags)
; name : LPCSTR -> "str"
; outputString : LPSTR out -> "var"
; maxStringLength : DWORD -> "int"
; flags : 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")
	procUnDecorateSymbolName = dbghelp.NewProc("UnDecorateSymbolName")
)

// name (LPCSTR), outputString (LPSTR out), maxStringLength (DWORD), flags (DWORD)
r1, _, err := procUnDecorateSymbolName.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(name))),
	uintptr(outputString),
	uintptr(maxStringLength),
	uintptr(flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function UnDecorateSymbolName(
  name: PAnsiChar;   // LPCSTR
  outputString: PAnsiChar;   // LPSTR out
  maxStringLength: DWORD;   // DWORD
  flags: DWORD   // DWORD
): DWORD; stdcall;
  external 'dbghelp.dll' name 'UnDecorateSymbolName';

result := DllCall("dbghelp\UnDecorateSymbolName"
    , "AStr", name   ; LPCSTR
    , "Ptr", outputString   ; LPSTR out
    , "UInt", maxStringLength   ; DWORD
    , "UInt", flags   ; DWORD
    , "UInt")   ; return: DWORD

●UnDecorateSymbolName(name, outputString, maxStringLength, flags) = DLL("dbghelp.dll", "dword UnDecorateSymbolName(char*, char*, dword, dword)")
# 呼び出し: UnDecorateSymbolName(name, outputString, maxStringLength, flags)
# name : LPCSTR -> "char*"
# outputString : LPSTR out -> "char*"
# maxStringLength : DWORD -> "dword"
# flags : 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)。