使用Window API,如何确保控件保留原生外观？

#include<Windows.h>
#include <tchar.h>

HWND hwnd = CreateWindowEx(WS_EX_TRANSPARENT | WS_EX_LAYERED, _T("Your Control Class Name Here"), _T("Your Title Here"),...);
// ...

// 关闭后设置控件为非透明
SetLayeredWindowAttributes(hwnd, RGB(255, 255, 255), 0, LWA_COLORKEY);

#include <cstdlib>
#include <cstdio>
#include<Windows.h>
#include <d2d1.h>
#include<windowsx.h>

int main() {
  HWND main_hwnd = NULL, canvas_hwnd = NULL;
  HWND canvas_parent = FindWindow(_T("ParentWindowClassName"), NULL);
  HDC canvas_hdc = GetDC(canvas_hwnd), main_hdc = CreateCompatibleDC(0);
  HBITMAP bmp_bitmap = CreateCompatibleBitmap(0, 500, 500);
  HBITMAP old_bitmap = (HBITMAP)SelectObject(main_hdc, bmp_bitmap), old_bitmap_mask = (HBITMAP)SelectObject(main_hdc, CreatePatternBitmap(bmp_bitmap));
  HBRUSH parent_brush, canvas_pen, canvas_brush;
  RECT main_rect, canvas_rect;

  // 设置画布
  GetClientRect(canvas_hwnd, &canvas_rect);
  parent_brush = GetClassLong(canvas_parent, CS_HREDRAW);
  parent_brush = (HBRUSH)SelectObject(