Namespace
Varianti

std::fseek

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Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
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Streams
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Astrazioni
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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
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
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Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
C-style I / O
Funzioni
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Functions
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Accesso ai file
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File access
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Diretta input / output
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Direct input/output
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fread
fwrite
Ingresso formattato / uscita
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Unformatted input/output
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Formattato di input / output
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Formatted input/output
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File di posizionamento
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File positioning
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ftell
fgetpos
fseek
fsetpos
rewind
La gestione degli errori
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Error handling
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clearerr
feof
ferror
perror
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remove
rename
tmpfile
tmpnam
 
Defined in header <cstdio>
int fseek( std::FILE* stream, long offset, int origin );
Consente di impostare l'indicatore di posizione del file per il file di flusso stream come segue:
Original:
Sets the file position indicator for the file stream stream as follows:
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Se il stream è aperto in modo binario, la nuova posizione è esattamente offset byte misurata dall'inizio del file è origin è SEEK_SET, dalla posizione file corrente se origin è SEEK_CUR, e dalla fine del file se origin è SEEK_END. Alcuni flussi binari potrebbero non supportare la SEEK_END.
Original:
If the stream is open in binary mode, the new position is exactly offset bytes measured from the beginning of the file is origin is SEEK_SET, from the current file position if origin is SEEK_CUR, and from the end of the file if origin is SEEK_END. Some binary streams may not support the SEEK_END.
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Se il stream è aperto in modalità testo, gli unici valori supportati per offset sono pari a zero (che funziona con qualsiasi origin) e un valore restituito da una precedente chiamata a std::ftell su un flusso associato al file stesso (che funziona solo con origin di SEEK_SET.
Original:
If the stream is open in text mode, the only supported values for offset are zero (which works with any origin) and a value returned by an earlier call to std::ftell on a stream associated with the same file (which only works with origin of SEEK_SET.
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Oltre a modificare l'indicatore di posizione del file, fseek annulla gli effetti della std::ungetc e cancella la fine del file di stato, se del caso.
Original:
In addition to changing the file position indicator, fseek undoes the effects of std::ungetc and clears the end-of-file status, if applicable.
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caso di lettura o scrittura di errore, l'indicatore di errore per il flusso ( std::ferror) viene impostato e la posizione del file non è influenzato.
Original:
If a read or write error occurs, the error indicator for the stream (std::ferror) is set and the file position is unaffected.
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Indice

[modifica] Parametri

stream -
stream file da modificare
Original:
file stream to modify
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offset -
numero di caratteri da spostare la posizione relativa di origine
Original:
number of characters to shift the position relative to origin
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origin -
posizione in cui viene aggiunto offset. Può avere uno dei seguenti valori: SEEK_SET, SEEK_CUR, SEEK_END
Original:
position to which offset is added. It can have one of the following values: SEEK_SET, SEEK_CUR, SEEK_END
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[modifica] Valore di ritorno

0 caso di successo, valore diverso da zero in caso contrario.
Original:
0 upon success, nonzero value otherwise.
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[modifica] Esempio

[modifica] Vedi anche

si sposta l'indicatore di posizione file in una posizione specifica in un file
Original:
moves the file position indicator to a specific location in a file
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(funzione) [edit]
ottiene l'indicatore di posizione del file
Original:
gets the file position indicator
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(funzione) [edit]
restituisce l'attuale indicatore di posizione del file
Original:
returns the current file position indicator
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(funzione) [edit]
sposta l'indicatore di posizione file all'inizio in un file
Original:
moves the file position indicator to the beginning in a file
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(funzione) [edit]
C documentation for fseek