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Aug 12th, 2017
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  1. char szMainWndClass[] = "SomeWindowClass";
  2. int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
  3. {
  4. if (FindWindow(szMainWindowClass, NULL))
  5. {
  6. MessageBox(NULL, "Копия программы уже запущена", "Ошибка", MB_OK);
  7. return 0;
  8. }
  9. // регистрируем класс окна и создаем главное окно
  10. return 0;
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