//Листинг П.2. Поиск главного окна дочернего процесса


TCHAR title[256] = _T("Новое окно блокнота");
TCHAR CommandLine[256] = _T("notepad ReadMe.txt");
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  static STARTUPINFO tin;
  static PROCESS_INFORMATION pInfo;
  HWND hFind;
  DWORD id, hParentEdit;
  switch (message)
  {
  case WM_CREATE:
    tin.cb = sizeof(STARTUPINFO);
    tin.dwFlags = STARTF_USESHOWWINDOW;
    tin.wShowWindow = SW_SHOWNORMAL;
    CreateProcess(NULL, CommandLine, NULL, NULL, FALSE, 0, NULL, NULL,
	               &tin, &pInfo);
    CloseHandle(pInfo.hThread);
    CloseHandle(pInfo.hProcess);
    break;
  case WM_COMMAND:
    switch (LOWORD(wParam))
    {
    case ID_FINDWINDOWS:
      hFind = GetTopWindow(NULL);
      do 
      {
        if (hFind == 0)
        {
          MessageBox(hWnd, _T("Окно не нейдено"),
                    _T("Ошибка поиска"), MB_OK | MB_ICONQUESTION);
          DestroyWindow(hWnd);
          return 1;
        }
        GetWindowThreadProcessId(hFind, &id);
        hParentEdit = GetWindowLong(hFind, GWL_HWNDPARENT);
        if (hParentEdit == 0 && id == pInfo.dwProcessId)
        {
          SendMessage (hFind, WM_SETTEXT, 0, (LPARAM)title);
          return 0;
        }
        hFind = GetWindow(hFind, GW_HWNDNEXT);
      }
      while (true);
      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;
}