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std::freopen

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Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
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
Original:
File access
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fopen
freopen
fclose
fflush
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
fgetpos
fseek
fsetpos
rewind
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>
FILE *freopen( const char *filename, const char *mode, FILE *stream );
Vuelve a asignar un stream archivo continuo existente en un archivo diferente identificados por filenameusing modo especificado. mode se utiliza para determinar el acceso al archivo de nuevo .
Original:
Reassigns an existing file stream stream to a different file identified by filenameusing specified mode. mode is used to determine the new file access mode.
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Contenido

[editar] Parámetros

filename -
nombre de archivo para asociar la secuencia de archivo para
Original:
file name to associate the file stream to
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mode -
terminada en nulo de serie de caracteres para determinar el nuevo modo de acceso a archivos
File access
mode string
Meaning Explanation Action if file
already exists
Action if file
does not exist
"r" read Open a file for reading read from start failure to open
"w" write Create a file for writing destroy contents create new
"a" append Append to a file write to end create new
"r+" read extended Open a file for read/write read from start error
"w+" write extended Create a file for read/write destroy contents create new
"a+" append extended Open a file for read/write write to end create new
File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
Original:
null-terminated character string determining new file access mode
File access
mode string
Meaning Explanation Action if file
already exists
Action if file
does not exist
"r" read Open a file for reading read from start failure to open
"w" write Create a file for writing destroy contents create new
"a" append Append to a file write to end create new
"r+" read extended Open a file for read/write read from start error
"w+" write extended Create a file for read/write destroy contents create new
"a+" append extended Open a file for read/write write to end create new
File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
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stream -
la secuencia de archivo que desea modificar
Original:
the file stream to modify
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[editar] Valor de retorno

stream en caso de éxito, NULL en caso de fallo
Original:
stream on success, NULL on failure
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[editar] Ejemplo

El código siguiente redirige stdout en un archivo
Original:
The following code redirects stdout to a file
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#include <cstdio>
 
int main()
{
    std::printf("stdout is printed to console");
    std::freopen("redir.txt", "w", stdout);
    std::printf("stdout is redirected to a file")
    std::fclose(stdout);
}

Output:

stdout is printed to console

[editar] Ver también

se abre un archivo
Original:
opens a file
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(función) [edit]
cierra un archivo
Original:
closes a file
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(función) [edit]
C documentation for freopen