std::basic_istream::read
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| basic_istream& read( char_type* s, std::streamsize count ); |
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Estrae i caratteri dal flusso.
Original:
Extracts characters from stream.
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Si comporta come
UnformattedInputFunction. Dopo la costruzione e la verifica dell'oggetto sentinella, estrae i caratteri e li memorizza in posizioni successive della matrice di caratteri il cui primo elemento è puntato da s. Caratteri vengono estratti e memorizzati fino a qualsiasi delle seguenti condizioni:Original:
Behaves as
UnformattedInputFunction. After constructing and checking the sentry object, extracts characters and stores them into successive locations of the character array whose first element is pointed to by s. Characters are extracted and stored until any of the following conditions occurs:The text has been machine-translated via Google Translate.
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- Caratteri
countstati estratti e memorizzatiOriginal:countcharacters were extracted and storedThe text has been machine-translated via Google Translate.
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- condizione di fine file avviene sulla sequenza di ingresso (in questo caso, è chiamato setstate(failbit|eofbit).Original:end of file condition occurs on the input sequence (in which case, setstate(failbit|eofbit) is called.The text has been machine-translated via Google Translate.
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Indice |
Parametri
| s | - | puntatore alla matrice di caratteri per memorizzare i caratteri
Original: pointer to the character array to store the characters to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| count | - | numero di caratteri da leggere
Original: number of characters to read The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Valore di ritorno
*this
Esempio
read () viene spesso usato per binari I / O
Original:
read() is often used for binary I/O
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#include <iostream> #include <string> #include <sstream> #include <cstdint> int main() { std::string bin = {'\x12', '\x12', '\x12', '\x12'}; std::istringstream raw(bin); std::uint32_t n; raw.read(reinterpret_cast<char*>(&n), 4); std::cout << std::hex << std::showbase << n << '\n'; }
Output:
0x12121212
