//Листинг П.1. Поиск всех окон системы

#include <string>
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static std::wstring st(L"hProcess    hParent      idProcess    hWindows     Title\r\n");
  HWND hFind;
  static HWND hEdit;
  TCHAR str[80], title[256];
  LONG hProcess, hParentEdit;

  DWORD id;
  switch (message)
  {
  case WM_CREATE:
    hEdit = CreateWindow(L"Edit", NULL, WS_CHILD|WS_VISIBLE|WS_HSCROLL|
		WS_VSCROLL|ES_LEFT|ES_MULTILINE|ES_AUTOHSCROLL|ES_AUTOVSCROLL,
      0, 0, 0, 0, hWnd, (HMENU) 1, hInst, NULL);
	break;
  case WM_SIZE:
    MoveWindow(hEdit, 0, 0, LOWORD(lParam), HIWORD(lParam), TRUE);
    break;
  case WM_COMMAND:
    switch (LOWORD(wParam))
    {
    case ID_FIND:
      hFind = GetTopWindow(NULL);
      do
      {
        hProcess = GetWindowLong(hFind,GWL_HINSTANCE);
        hParentEdit = GetWindowLong(hFind, GWL_HWNDPARENT);
        SendMessage(hFind, WM_GETTEXT, (WPARAM)256, (LPARAM)title);
        GetWindowThreadProcessId(hFind, &id);
        wsprintf(str, L"%.8x   %.8x   %.8d   %.8x     %s\r\n", hProcess,
               hParentEdit, id, hFind, title);
        st.append(str);
        hFind = GetWindow(hFind, GW_HWNDNEXT);
      }
      while (hFind);
      SetWindowText(hEdit, st.c_str());
      break;
    case IDM_EXIT: DestroyWindow(hWnd); break;
    default: return DefWindowProc(hWnd, message, wParam, lParam);
    }
    break;
  case WM_DESTROY: PostQuitMessage(0) ; break;
  default: return DefWindowProc(hWnd, message, wParam, lParam);
  }
return 0;
}