Kasowanie linijki w konsoli

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10:38
Sun
22
Jun 2008

Kasowanie linijki w konsoli

Konsola systemowa, używana przez funkcje C (jak printf) lub C++ (jak std::cout) pozwala tylko wypisywać na wyjście i pobierać na wejściu znaki lub całe łańcuchy. Dopiero Windows API umożliwia bardziej niskopioziomowe reagowanie na klawiaturę, myszkę i swobodne rysowanie znakami po dowolnych miejscach konsoli, także z użyciem kolorów. Zawsze zastanawiało mnie, jak bez WinAPI radzą sobie twórcy programów konsolowych, którzy kasują bieżącą linijkę zamiast tylko dopisywać nowe informacje, jak wtedy kiedy następuje odliczanie 10%, 20%, 30% itd.

Ostatnio znalazłem rozwiązanie. Jest nim magiczny znak "\r", który użyty samodzielnie (a nie jako część końca wiersza "\r\n") powoduje powrót karetki na początek linii umożliwiając napisanie w jej miejscu czegoś nowego. Na przykład:

for (unsigned i = 0; i < 10; i++)
{
  std::cout << "\rLiczba: " << i;
  Sleep(500);
}
std::cout << std::endl;

Comments (1) | Tags: c++ stl algorithms | Author: Adam Sawicki | Share

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2016-03-29 09:35:21
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