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std::freopen

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De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
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Streams
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Abstrações
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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
Cordas I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
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Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
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Types
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streamoff
streamsize
fpos
Interface de categoria de erro
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
C estilo de I / O
Funções
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Functions
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Arquivo de acesso
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File access
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fopen
freopen
fclose
fflush
Directa de entrada / saída
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Direct input/output
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fread
fwrite
Não formatado entrada / saída
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Unformatted input/output
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Formatado de entrada / saída
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Formatted input/output
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Arquivo de posicionamento
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File positioning
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ftell
fgetpos
fseek
fsetpos
rewind
De tratamento de erros
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Error handling
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clearerr
feof
ferror
perror
Operações em arquivos
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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 );
Reatribui um stream córrego existente para um arquivo diferente, identificado por filenameusing modo especificado. mode é usado para determinar o modo de acesso novo arquivo.
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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Índice

[editar] Parâmetros

filename -
Nome do arquivo para associar o fluxo de arquivo
Original:
file name to associate the file stream to
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mode -
terminada em nulo cadeia de caracteres que determina o modo de acesso do novo arquivo
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 -
o fluxo de arquivos para modificar
Original:
the file stream to modify
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[editar] Valor de retorno

stream no sucesso NULL, em caso de falha
Original:
stream on success, NULL on failure
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[editar] Exemplo

O código a seguir redireciona stdout para um arquivo
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] Veja também

abre um arquivo
Original:
opens a file
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(função) [edit]
fecha um arquivo
Original:
closes a file
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(função) [edit]
C documentation for freopen