Varianti

    std::fseek

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    <metanoindex/>

     
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    fread
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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
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    <tbody> </tbody>
    Elemento definito nell'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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    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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    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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    Esempio

    This section is incomplete
    Reason: no example

    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) [modifica]
    ottiene l'indicatore di posizione del file
    Original:
    gets the file position indicator
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    (funzione) [modifica]
    restituisce l'attuale indicatore di posizione del file
    Original:
    returns the current file position indicator
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    (funzione) [modifica]
    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) [modifica]
    C documentation for fseek