UnDecorateSymbolNameW

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

DWORD UnDecorateSymbolNameW(
    LPCWSTR name,
    LPWSTR outputString,
    DWORD maxStringLength,
    DWORD flags
);

<DllImport("dbghelp.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function UnDecorateSymbolNameW(
    <MarshalAs(UnmanagedType.LPWStr)> name As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> outputString As System.Text.StringBuilder,   ' LPWSTR out
    maxStringLength As UInteger,   ' DWORD
    flags As UInteger   ' DWORD
) As UInteger
End Function

' name : LPCWSTR
' outputString : LPWSTR out
' maxStringLength : DWORD
' flags : DWORD
Declare PtrSafe Function UnDecorateSymbolNameW Lib "dbghelp" ( _
    ByVal name As LongPtr, _
    ByVal outputString As LongPtr, _
    ByVal maxStringLength As Long, _
    ByVal flags 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

UnDecorateSymbolNameW = ctypes.windll.dbghelp.UnDecorateSymbolNameW
UnDecorateSymbolNameW.restype = wintypes.DWORD
UnDecorateSymbolNameW.argtypes = [
    wintypes.LPCWSTR,  # name : LPCWSTR
    wintypes.LPWSTR,  # outputString : LPWSTR 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')
UnDecorateSymbolNameW = Fiddle::Function.new(
  lib['UnDecorateSymbolNameW'],
  [
    Fiddle::TYPE_VOIDP,  # name : LPCWSTR
    Fiddle::TYPE_VOIDP,  # outputString : LPWSTR out
    -Fiddle::TYPE_INT,  # maxStringLength : DWORD
    -Fiddle::TYPE_INT,  # flags : DWORD
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "dbghelp")]
extern "system" {
    fn UnDecorateSymbolNameW(
        name: *const u16,  // LPCWSTR
        outputString: *mut u16,  // LPWSTR out
        maxStringLength: u32,  // DWORD
        flags: u32  // DWORD
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "dbghelp.dll"
#func global UnDecorateSymbolNameW "UnDecorateSymbolNameW" wptr, wptr, wptr, wptr
; UnDecorateSymbolNameW name, varptr(outputString), maxStringLength, flags   ; 戻り値は stat
; name : LPCWSTR -> "wptr"
; outputString : LPWSTR out -> "wptr"
; maxStringLength : DWORD -> "wptr"
; flags : 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 UnDecorateSymbolNameW "UnDecorateSymbolNameW" wstr, var, int, int
; res = UnDecorateSymbolNameW(name, outputString, maxStringLength, flags)
; name : LPCWSTR -> "wstr"
; outputString : LPWSTR 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 UnDecorateSymbolNameW(LPCWSTR name, LPWSTR outputString, DWORD maxStringLength, DWORD flags)
#uselib "dbghelp.dll"
#cfunc global UnDecorateSymbolNameW "UnDecorateSymbolNameW" wstr, var, int, int
; res = UnDecorateSymbolNameW(name, outputString, maxStringLength, flags)
; name : LPCWSTR -> "wstr"
; outputString : LPWSTR 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")
	procUnDecorateSymbolNameW = dbghelp.NewProc("UnDecorateSymbolNameW")
)

// name (LPCWSTR), outputString (LPWSTR out), maxStringLength (DWORD), flags (DWORD)
r1, _, err := procUnDecorateSymbolNameW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(name))),
	uintptr(outputString),
	uintptr(maxStringLength),
	uintptr(flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function UnDecorateSymbolNameW(
  name: PWideChar;   // LPCWSTR
  outputString: PWideChar;   // LPWSTR out
  maxStringLength: DWORD;   // DWORD
  flags: DWORD   // DWORD
): DWORD; stdcall;
  external 'dbghelp.dll' name 'UnDecorateSymbolNameW';

result := DllCall("dbghelp\UnDecorateSymbolNameW"
    , "WStr", name   ; LPCWSTR
    , "Ptr", outputString   ; LPWSTR out
    , "UInt", maxStringLength   ; DWORD
    , "UInt", flags   ; DWORD
    , "UInt")   ; return: DWORD

●UnDecorateSymbolNameW(name, outputString, maxStringLength, flags) = DLL("dbghelp.dll", "dword UnDecorateSymbolNameW(char*, char*, dword, dword)")
# 呼び出し: UnDecorateSymbolNameW(name, outputString, maxStringLength, flags)
# name : LPCWSTR -> "char*"
# outputString : LPWSTR 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。