Namespace
Varianti

std::fgets

Da cppreference.com.
< cpp‎ | io‎ | 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
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Streams
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Astrazioni
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
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Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
C-style I / O
Funzioni
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Functions
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Accesso ai file
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File access
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Diretta input / output
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Direct input/output
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fread
fwrite
Ingresso formattato / uscita
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Unformatted input/output
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Formattato di input / output
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Formatted input/output
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File di posizionamento
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File positioning
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ftell
fgetpos
fseek
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rewind
La gestione degli errori
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Error handling
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clearerr
feof
ferror
perror
Le operazioni sui file
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Operations on files
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remove
rename
tmpfile
tmpnam
 
Defined in header <cstdio>
char *fgets( char *str, int count, FILE *stream );
Legge a personaggi più count - 1 dal flusso di file dato e li memorizza in str. La stringa di caratteri prodotta è sempre NULL-terminato. Parsing si arresta se end-of-file di verifica o un carattere di nuova riga viene trovato, nel qual caso str conterrà quel personaggio capo.
Original:
Reads at most count - 1 characters from the given file stream and stores them in str. The produced character string is always NULL-terminated. Parsing stops if end-of-file occurs or a newline character is found, in which case str will contain that newline character.
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Indice

[modifica] Parametri

str -
stringa per leggere i caratteri
Original:
string to read the characters to
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count -
la lunghezza di str
Original:
the length of str
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stream -
stream file per leggere i dati
Original:
file stream to read the data from
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[modifica] Valore di ritorno

str in caso di successo, NULL su un errore
Original:
str on success, NULL on an error
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[modifica] Esempio

#include <iostream>
#include <cstdio>
#include <cstdlib>
 
int main()
{
    FILE* tmpf = std::tmpfile();
    std::fputs("Alan Turing\n", tmpf);
    std::fputs("John von Neumann\n", tmpf);
    std::fputs("Alonzo Church\n", tmpf);
 
    std::rewind(tmpf);
    char buf[8];
    while (std::fgets(buf, sizeof buf, tmpf) != NULL) {
        std::cout << '"' << buf << '"' << '\n';
    }
}

Output:

"Alan Tu"
"ring
"
"John vo"
"n Neuma"
"nn
"
"Alonzo "
"Church
"

[modifica] Vedi anche

legge l'input formattato da stdin, un flusso di file o di un buffer
Original:
reads formatted input from stdin, a file stream or a buffer
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(funzione) [edit]
legge una stringa di caratteri da stdin
Original:
reads a character string from stdin
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(funzione) [edit]
Scrive una stringa di caratteri in un flusso di file
Original:
writes a character string to a file stream
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(funzione) [edit]
C documentation for fgets