fopen – cppreference.com

fopen

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File input/output
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
fseek
fsetpos
rewind
Fehlerbehandlung
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Error handling
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clearerr
feof
ferror
perror
Operationen auf Dateien
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Operations on files
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remove
rename
tmpfile
tmpnam
 
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definiert in Header <stdio.h>
FILE *fopen( const char *filename, const char *mode );

Öffnet die Datei filename und gibt den Daten-Stream, der mit dieser Datei verbunden ist, zurück. mode wird verwendet, um den Zugriff auf den Dateien-Modus fest zu legen.

Parameter

filename - dateiname, um den Datei-Stream ein zu richten
mode - null-terminierte Zeichenkette zur Bestimmung des Dateizugriffsmodus
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.

Rückgabewert

Bei Erfolg wird der geöffnete Datei-Stream zurück gegeben, NULL im Fehlerfall

Siehe auch