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std::tmpfile

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De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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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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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* tmpfile();
Cria e abre um arquivo temporário com nome gerado automaticamente única.
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Creates and opens a temporary file with unique auto-generated filename.
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O arquivo é aberto como um arquivo binário para atualização (como por std::fopen com o modo de acesso "wb+"). Arquivos, pelo menos, TMP_MAX podem ser abertas durante a vigência de um programa (este limite pode ser compartilhada com std::tmpnam e pode ser ainda mais limitada por FOPEN_MAX)
Original:
The file is opened as binary file for update (as by std::fopen with access mode "wb+"). At least TMP_MAX files may be opened during the lifetime of a program (this limit may be shared with std::tmpnam and may be further limited by FOPEN_MAX)
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Se o programa é fechado o ficheiro, por exemplo, executando std::fclose, o arquivo é automaticamente excluído.
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If the program closes the file, e.g. by executing std::fclose, the file is automatically deleted.
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Se o programa termina normalmente (chamando std::exit, retornando de main, etc), todos os arquivos que foram abertos chamando std::tmpfile também são excluídos automaticamente.
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If the program terminates normally (by calling std::exit, returning from main, etc), all files that were opened by calling std::tmpfile are also automatically deleted.
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Se o programa termina de forma anormal, é definida pela implementação se esses arquivos temporários são excluídos.
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If the program terminates abnormally, it is implementation-defined if these temporary files are deleted.
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Índice

[editar] Parâmetros

(Nenhum)
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(none)
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[editar] Valor de retorno

O fluxo de arquivo associado ou NULL se um erro ocorreu
Original:
The associated file stream or NULL if an error has occurred
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[editar] Notas

Em algumas implementações (por exemplo, Linux), esta função realmente cria, abre, e imediatamente exclui o arquivo do sistema de arquivos: enquanto um descritor de arquivo aberto com um arquivo excluído é realizada por um programa, o arquivo existe, mas desde que foi excluído, seu nome não aparece em qualquer diretório, para que nenhum outro processo pode abri-lo. Uma vez que o descritor de arquivo é fechado, o espaço ocupado pelo arquivo é recuperado pelo sistema de arquivos.
Original:
On some implementations (e.g. Linux), this function actually creates, opens, and immediately deletes the file from the file system: as long as an open file descriptor to a deleted file is held by a program, the file exists, but since it was deleted, its name does not appear in any directory, so that no other process can open it. Once the file descriptor is closed, the space occupied by the file is reclaimed by the filesystem.
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[editar] Exemplo

#include <iostream>
#include <cstdio>
#include <cstdlib>
 
int main()
{
    FILE* tmpf = std::tmpfile();
    std::fputs("Hello, world", tmpf);
    std::rewind(tmpf);
    char buf[6];
    std::fgets(buf, sizeof buf, tmpf);
    std::cout << buf << '\n';
 
    // Linux-specific method to display the tmpfile name
    std::system("ls -l /proc/self/fd/3");
}

Possible output:

Hello
lrwx------ 1 user group 64 Jun 27 00:28 /proc/self/fd/3 -> /tmp/tmpfXu58Zi (deleted)

[editar] Veja também

retorna um nome único
Original:
returns a unique filename
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(função) [edit]
C documentation for tmpfile