SymAddSymbolW

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

BOOL SymAddSymbolW(
    HANDLE hProcess,
    ULONGLONG BaseOfDll,
    LPCWSTR Name,
    ULONGLONG Address,
    DWORD Size,
    DWORD Flags
);

<DllImport("dbghelp.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SymAddSymbolW(
    hProcess As IntPtr,   ' HANDLE
    BaseOfDll As ULong,   ' ULONGLONG
    <MarshalAs(UnmanagedType.LPWStr)> Name As String,   ' LPCWSTR
    Address As ULong,   ' ULONGLONG
    Size As UInteger,   ' DWORD
    Flags As UInteger   ' DWORD
) As Boolean
End Function

' hProcess : HANDLE
' BaseOfDll : ULONGLONG
' Name : LPCWSTR
' Address : ULONGLONG
' Size : DWORD
' Flags : DWORD
Declare PtrSafe Function SymAddSymbolW Lib "dbghelp" ( _
    ByVal hProcess As LongPtr, _
    ByVal BaseOfDll As LongLong, _
    ByVal Name As LongPtr, _
    ByVal Address As LongLong, _
    ByVal Size 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

SymAddSymbolW = ctypes.windll.dbghelp.SymAddSymbolW
SymAddSymbolW.restype = wintypes.BOOL
SymAddSymbolW.argtypes = [
    wintypes.HANDLE,  # hProcess : HANDLE
    ctypes.c_ulonglong,  # BaseOfDll : ULONGLONG
    wintypes.LPCWSTR,  # Name : LPCWSTR
    ctypes.c_ulonglong,  # Address : ULONGLONG
    wintypes.DWORD,  # Size : 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')
SymAddSymbolW = Fiddle::Function.new(
  lib['SymAddSymbolW'],
  [
    Fiddle::TYPE_VOIDP,  # hProcess : HANDLE
    -Fiddle::TYPE_LONG_LONG,  # BaseOfDll : ULONGLONG
    Fiddle::TYPE_VOIDP,  # Name : LPCWSTR
    -Fiddle::TYPE_LONG_LONG,  # Address : ULONGLONG
    -Fiddle::TYPE_INT,  # Size : DWORD
    -Fiddle::TYPE_INT,  # Flags : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "dbghelp")]
extern "system" {
    fn SymAddSymbolW(
        hProcess: *mut core::ffi::c_void,  // HANDLE
        BaseOfDll: u64,  // ULONGLONG
        Name: *const u16,  // LPCWSTR
        Address: u64,  // ULONGLONG
        Size: u32,  // DWORD
        Flags: 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 SymAddSymbolW(IntPtr hProcess, ulong BaseOfDll, [MarshalAs(UnmanagedType.LPWStr)] string Name, ulong Address, uint Size, uint Flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dbghelp_SymAddSymbolW' -Namespace Win32 -PassThru
# $api::SymAddSymbolW(hProcess, BaseOfDll, Name, Address, Size, Flags)

#uselib "dbghelp.dll"
#func global SymAddSymbolW "SymAddSymbolW" wptr, wptr, wptr, wptr, wptr, wptr
; SymAddSymbolW hProcess, BaseOfDll, Name, Address, Size, Flags   ; 戻り値は stat
; hProcess : HANDLE -> "wptr"
; BaseOfDll : ULONGLONG -> "wptr"
; Name : LPCWSTR -> "wptr"
; Address : ULONGLONG -> "wptr"
; Size : DWORD -> "wptr"
; Flags : DWORD -> "wptr"
; ※HSP3.7は int64 引数(64bit値渡し)に非対応です。
; ※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 SymAddSymbolW "SymAddSymbolW" sptr, int64, wstr, int64, int, int
; res = SymAddSymbolW(hProcess, BaseOfDll, Name, Address, Size, Flags)
; hProcess : HANDLE -> "sptr"
; BaseOfDll : ULONGLONG -> "int64"
; Name : LPCWSTR -> "wstr"
; Address : ULONGLONG -> "int64"
; Size : DWORD -> "int"
; Flags : DWORD -> "int"
; ※int64 引数の DLL 値渡しは x64 ランタイム(hsp3_64)のみ対応(x86 は未対応)。

; BOOL SymAddSymbolW(HANDLE hProcess, ULONGLONG BaseOfDll, LPCWSTR Name, ULONGLONG Address, DWORD Size, DWORD Flags)
#uselib "dbghelp.dll"
#cfunc global SymAddSymbolW "SymAddSymbolW" intptr, int64, wstr, int64, int, int
; res = SymAddSymbolW(hProcess, BaseOfDll, Name, Address, Size, Flags)
; hProcess : HANDLE -> "intptr"
; BaseOfDll : ULONGLONG -> "int64"
; Name : LPCWSTR -> "wstr"
; Address : ULONGLONG -> "int64"
; Size : DWORD -> "int"
; Flags : DWORD -> "int"

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

var (
	dbghelp = windows.NewLazySystemDLL("dbghelp.dll")
	procSymAddSymbolW = dbghelp.NewProc("SymAddSymbolW")
)

// hProcess (HANDLE), BaseOfDll (ULONGLONG), Name (LPCWSTR), Address (ULONGLONG), Size (DWORD), Flags (DWORD)
r1, _, err := procSymAddSymbolW.Call(
	uintptr(hProcess),
	uintptr(BaseOfDll),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(Name))),
	uintptr(Address),
	uintptr(Size),
	uintptr(Flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SymAddSymbolW(
  hProcess: THandle;   // HANDLE
  BaseOfDll: UInt64;   // ULONGLONG
  Name: PWideChar;   // LPCWSTR
  Address: UInt64;   // ULONGLONG
  Size: DWORD;   // DWORD
  Flags: DWORD   // DWORD
): BOOL; stdcall;
  external 'dbghelp.dll' name 'SymAddSymbolW';

result := DllCall("dbghelp\SymAddSymbolW"
    , "Ptr", hProcess   ; HANDLE
    , "Int64", BaseOfDll   ; ULONGLONG
    , "WStr", Name   ; LPCWSTR
    , "Int64", Address   ; ULONGLONG
    , "UInt", Size   ; DWORD
    , "UInt", Flags   ; DWORD
    , "Int")   ; return: BOOL

●SymAddSymbolW(hProcess, BaseOfDll, Name, Address, Size, Flags) = DLL("dbghelp.dll", "bool SymAddSymbolW(void*, qword, char*, qword, dword, dword)")
# 呼び出し: SymAddSymbolW(hProcess, BaseOfDll, Name, Address, Size, Flags)
# hProcess : HANDLE -> "void*"
# BaseOfDll : ULONGLONG -> "qword"
# Name : LPCWSTR -> "char*"
# Address : ULONGLONG -> "qword"
# Size : 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。