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std::perror

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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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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
Cadena de I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
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Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
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Types
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streamoff
streamsize
fpos
Error interfaz categoría
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
C-estilo I / O
Funciones
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Functions
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Acceso a archivos
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File access
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Directo de entrada / salida
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Direct input/output
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fread
fwrite
Entrada sin formato / salida
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Unformatted input/output
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Formato de entrada / salida
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Formatted input/output
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Presentar posicionamiento
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File positioning
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ftell
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Gestión de errores
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Error handling
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clearerr
feof
ferror
perror
Las operaciones en los archivos
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Operations on files
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remove
rename
tmpfile
tmpnam
 
Defined in header <cstdio>
void perror( const char *s );
Láminas a stderr el contenido de la cadena de caracteres terminada en nulo apuntado por s (a menos que s es un puntero nulo), seguido de los dos caracteres ": ", seguido de la aplicación definida mensaje de error que describe el código de error almacenado actualmente en la variable de sistema errno (idéntica a la salida de std::strerror(errno)), seguido por '\n' .
Original:
Prints to stderr the contents of the null-terminated character string pointed to by s (unless s is a null pointer), followed by the two characters ": ", followed by the implementation-defined error message describing the error code currently stored in the system variable errno (identical to the output of std::strerror(errno)), followed by '\n'.
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Contenido

[editar] Parámetros

s -
puntero a una cadena terminada en nulo con mensaje explicativo
Original:
pointer to a null-terminated string with explanatory message
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[editar] Valor de retorno

(Ninguno)
Original:
(none)
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[editar] Ejemplo

#include <cmath>
#include <cerrno>
#include <cstdio>
 
int main()
{
    double not_a_number = std::log(-1.0);
    if (errno == EDOM) {
        std::perror("log(-1) failed");
    }
}

Output:

log(-1) failed: Numerical argument out of domain

[editar] Ver también

macro que se expande para POSIX compatible local de subprocesos variable
(variables macro) número de error
Original:
macro which expands to POSIX-compatible thread-local error number variable
(variables macro)
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[edit]
devuelve una versión de texto de un código de error
Original:
returns a text version of a given error code
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(función) [edit]
C documentation for perror