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std::fgets

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< cpp‎ | io‎ | c

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
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Streams
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Abstracciones
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Abstractions
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Cadena de I / O
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String I/O
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basic_istringstream
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Array I/O
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istrstream(obsoleto)
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strstream(obsoleto)
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Types
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streamoff
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Error category interface
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iostream_category(C++11)
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Funciones
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Directo de entrada / salida
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Direct input/output
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fread
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Entrada sin formato / salida
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Unformatted input/output
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Formatted input/output
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remove
rename
tmpfile
tmpnam
 
Defined in header <cstdio>
char *fgets( char *str, int count, FILE *stream );
Lee en la mayoría de los personajes count - 1 de la secuencia de archivo determinado y los almacena en str. La cadena de caracteres producida es siempre NULL-terminado. Procesamiento se detiene si al final de su archivo se produce o un carácter de nueva línea se encuentra, en cuyo caso str contendrá ese carácter de nueva línea .
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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Contenido

[editar] Parámetros

str -
String para leer los caracteres
Original:
string to read the characters to
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count -
la longitud de str
Original:
the length of str
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stream -
archivo de flujo para leer los datos
Original:
file stream to read the data from
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[editar] Valor de retorno

str en caso de éxito, NULL en un error
Original:
str on success, NULL on an error
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[editar] Ejemplo

#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
"

[editar] Ver también

lee la entrada con formato desde stdin, una secuencia de archivo o un tampón
Original:
reads formatted input from stdin, a file stream or a buffer
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(función) [edit]
lee una cadena de caracteres de stdin
Original:
reads a character string from stdin
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(función) [edit]
escribe una cadena de caracteres en una secuencia de archivo
Original:
writes a character string to a file stream
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(función) [edit]
C documentation for fgets