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    std::freopen

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    C++
     
    Input / Output-Bibliothek
    I / O-Manipulatoren
    C-style I / O
    Puffern
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    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf(veraltet)
    Streams
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    Streams
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    Abstraktionen
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    Abstractions
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    ios_base
    basic_ios
    basic_istream
    basic_ostream
    basic_iostream
    Datei-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(veraltet)
    ostrstream(veraltet)
    strstream(veraltet)
    Types
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    Types
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    streamoff
    streamsize
    fpos
    Fehler Kategorie Schnittstelle
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    Error category interface
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    iostream_category(C++11)
    io_errc(C++11)
     
    C-style I / O
    Funktionen
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    Functions
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    Dateizugriff
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    File access
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    Direkte Eingabe / Ausgabe
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    Direct input/output
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    fread
    fwrite
    Unformatierte Eingang / Ausgang
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    Unformatted input/output
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    Formatierte Eingabe / Ausgabe
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    Formatted input/output
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    Datei Positionierung
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    File positioning
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    ftell
    fgetpos
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    rewind
    Fehlerbehandlung
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    Error handling
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    clearerr
    feof
    ferror
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    Operationen auf Dateien
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    Operations on files
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    remove
    rename
    tmpfile
    tmpnam
     
    definiert in Header <cstdio>
    FILE *freopen(constchar*filename, constchar*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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    Inhaltsverzeichnis

    [Bearbeiten]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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    [Bearbeiten]Rückgabewert

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

    Der folgende Code leitet stdout in einer Datei
    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

    [Bearbeiten]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
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/io/c/freopen&oldid=26905“
    close