Varianti

    std::basic_istream::getline

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    <metanoindex/>

     
    C++
     
    Ingresso / libreria di output
    I / O manipolatori
    C-style I / O
    Buffer
    Original:
    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf(deprecato)
    Streams
    Original:
    Streams
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    Astrazioni
    Original:
    Abstractions
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    ios_base
    basic_ios
    basic_istream
    basic_ostream
    basic_iostream
    File I / O
    Original:
    File I/O
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    basic_ifstream
    basic_ofstream
    basic_fstream
    String I / O
    Original:
    String I/O
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    basic_istringstream
    basic_ostringstream
    basic_stringstream
    Array I / O
    Original:
    Array I/O
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    istrstream(deprecato)
    ostrstream(deprecato)
    strstream(deprecato)
    Tipi
    Original:
    Types
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    streamoff
    streamsize
    fpos
    Errore categoria interfaccia
    Original:
    Error category interface
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    iostream_category(C++11)
    io_errc(C++11)
     
    std::basic_istream
    Gli oggetti globali
    Original:
    Global objects
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    cin
    wcin
    Membri funzioni
    Original:
    Member functions
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    basic_istream::basic_istream
    basic_istream::~basic_istream
    basic_istream::operator=(C++11)
    Ingresso formattato
    Original:
    Formatted input
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    basic_istream::operator>>
    Ingresso non formattato
    Original:
    Unformatted input
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    basic_istream::get
    basic_istream::peek
    basic_istream::unget
    basic_istream::putback
    basic_istream::getline
    basic_istream::ignore
    basic_istream::read
    basic_istream::readsome
    basic_istream::gcount
    Posizionamento
    Original:
    Positioning
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    basic_istream::tellg
    basic_istream::seekg
    Varie
    Original:
    Miscellaneous
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    basic_istream::sync
    basic_istream::swap(C++11)
    Membri classi
    Original:
    Member classes
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    basic_istream::sentry
    Non membri funzioni
    Original:
    Non-member functions
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    operator>>(std::basic_istream)
     
    <tbody> </tbody>
    basic_istream& getline( char_type* s, std::streamsize count );
    		 (1)
    basic_istream& getline( char_type* s, std::streamsize count, char_type delim );
    		 (2)

    1)

    Caratteri estratti flusso fino alla fine della linea (equivalente a getline(s, count, widen(’\n’)))
    Original:
    Extracts characters from stream until the end of line (equivalent to getline(s, count, widen(’\n’)))
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    2)

    Estratti i caratteri dal flusso fino a quando il delimitatore specificato.
    Original:
    Extracts characters from stream until the specified delimiter.
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    Si comporta come UnformattedInputFunction. Dopo la costruzione e la verifica dell'oggetto sentinella, estrae i caratteri da *this e memorizzati in posizioni successive della matrice il cui primo elemento è puntato da s fino a qualsiasi dei seguenti casi: (testato nell'ordine indicato)
    Original:
    Behaves as UnformattedInputFunction. After constructing and checking the sentry object, extracts characters from *this and stored them in successive locations of the array whose first element is pointed to by s until any of the following occurs: (tested in the order shown)
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    • condizione di fine file avviene nella sequenza di input (nel qual caso setstate(eofbit) viene eseguita)
      Original:
      end of file condition occurs in the input sequence (in which case setstate(eofbit) is executed)
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    • il c successivo carattere disponibile è il delimitatore, come determinato da Traits::eq(c, delim). Il delimitatore viene estratto (a differenza basic_istream::get()) e conteggiati gcount(), ma non viene memorizzato.
      Original:
      the next available character c is the delimiter, as determined by Traits::eq(c, delim). The delimiter is extracted (unlike basic_istream::get()) and counted towards gcount(), but is not stored.
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    • Caratteri count-1 sono stati estratti (nel qual caso viene eseguita setstate(failbit)).
      Original:
      count-1 characters have been extracted (in which case setstate(failbit) is executed).
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    Se la funzione estrae nessun carattere (ad esempio, se count < 1), setstate(failbit) viene eseguito.
    Original:
    If the function extracts no characters (e.g. if count < 1), setstate(failbit) is executed.
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    In ogni caso, se count>0, si memorizza un carattere nullo CharT() nella successiva posizione successiva della matrice e aggiornamenti gcount().
    Original:
    In any case, if count>0, it then stores a null character CharT() into the next successive location of the array and updates gcount().
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    Note

    Poiché condizione # 2 è stato testato prima # 3, la linea di ingresso che si adatta esattamente il buffer, non attiva failbit.
    Original:
    Because condition #2 is tested before condition #3, the input line that exactly fits the buffer, does not trigger failbit.
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    Poiché il carattere di terminazione viene conteggiato come carattere estratto, ingresso di linea vuota non fa scattare failbit.
    Original:
    Because the terminating character is counted as extracted character, empty input line does not trigger failbit.
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    Parametri

    s -
    puntatore alla stringa di caratteri per memorizzare i caratteri
    Original:
    pointer to the character string to store the characters to
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    count -
    dimensione della stringa di caratteri a cui punta s
    Original:
    size of character string pointed to by s
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    delim -
    delimitando carattere per fermare l'estrazione a. E 'estratto ma non memorizzato .
    Original:
    delimiting character to stop the extraction at. It is extracted but not stored.
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    Valore di ritorno

    *this

    Esempio

    #include <iostream>
#include <sstream>
#include <vector>
#include <array>

int main()
{
    std::istringstream input("abc|def|gh");
    std::vector<std::array<char, 4>> v;

    for(std::array<char, 4> a; input.getline(&a[0], 4, '|'); ) {
        v.push_back(a);
    }

    for(auto& a : v) {
        std::cout << &a[0] << '\n';
    }
}

    Output: 

    abc
def
gh

    Vedi anche
    leggere i dati da un I / O corrente in una stringa
    Original:
    read data from an I/O stream into a string
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    (funzione)
    estratti i dati formattati
    Original:
    extracts formatted data
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    (metodo pubblico) [modifica]
    estratti di caratteri
    Original:
    extracts characters
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    (metodo pubblico) [modifica]
    estrae blocchi di caratteri
    Original:
    extracts blocks of characters
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    (metodo pubblico) [modifica]
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