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    freopen

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    <metanoindex/>

     
    C
     
    File input/output
    Funktionen
    Original:
    Functions
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    Dateizugriff
    Original:
    File access
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    Direkte Eingabe / Ausgabe
    Original:
    Direct input/output
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    fread
    fwrite
    Unformatierte Eingang / Ausgang
    Original:
    Unformatted input/output
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    Formatierte Eingabe / Ausgabe
    Original:
    Formatted input/output
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    Datei Positionierung
    Original:
    File positioning
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    ftell
    fgetpos
    fseek
    fsetpos
    rewind
    Fehlerbehandlung
    Original:
    Error handling
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    clearerr
    feof
    ferror
    perror
    Operationen auf Dateien
    Original:
    Operations on files
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    remove
    rename
    tmpfile
    tmpnam
     
    <tbody> </tbody>
    definiert in Header <stdio.h>
    FILE *freopen( const char *filename, const char *mode, FILE *stream );
    Weist eine vorhandene Datei Stream stream auf eine andere Datei filenameusing angegebenen Modus identifiziert. mode wird verwendet, um die neue Datei Zugriff Modus zu bestimmen .
    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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    Parameter

    filename -
    Dateinamen, um die Datei-Stream zu assoziieren
    Original:
    file name to associate the file stream to
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    mode -
    null-terminierte Zeichenkette Festlegung neuer File Access Modus
    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 -
    der Datei-Stream zu ändern
    Original:
    the file stream to modify
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    Rückgabewert

    stream bei Erfolg NULL im Fehlerfall
    Original:
    stream on success, NULL on failure
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    Beispiel

    Der folgende Code leitet stdout in einer Datei
    Original:
    The following code redirects stdout to a file
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    #include <stdio.h>

int main()
{
    printf("stdout is printed to console");
    freopen("redir.txt", "w", stdout);
    printf("Stdout is redirected to a file");
    fclose(stdout);
}

    Output: 

    stdout is printed to console

    Siehe auch
    öffnet eine Datei
    Original:
    opens a file
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    (Funktion) [edit]
    schließt eine Datei
    Original:
    closes a file
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    (Funktion) [edit]
    C++ documentation for freopen