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freopen

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File input/output
Funktionen
Original:
Functions
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Dateizugriff
Original:
File access
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fopen
freopen
fclose
fflush
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
 
Defined 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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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 <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

[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