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fread (3) and fwrite (3) are standard C library functions that read or write data from or to a file stream. Learn about their syntax, attributes, standards, history, examples and related functions.
Learn how to use fread () and fwrite () functions to read and write data from and to a file stream in C. See the syntax, description, return value, and related functions of fread (3).
9 maj 2023 · fread reads up to count objects of size size from the stream stream into the array buffer. It returns the number of objects read successfully, or zero if size or count is zero, or an error occurs.
Funkcja fread() odczytuje nmemb elementów danych, każdy o rozmiarze size bajtów, ze strumienia wskazywanego przez stream, do miejsca w pamięci wskazywanego przez ptr.
The function fread() reads nmemb items of data, each size bytes long, from the stream pointed to by stream, storing them at the location given by ptr. The function fwrite () writes nmemb items of data, each size bytes long, to the stream pointed to by stream , obtaining them from the location given by ptr .
Funkcje fread oraz fwrite zwracają ilość faktycznie zapisanych lub odczytanych elementów (nie liczbę znaków). Jeśli wystąpi błąd, lub osiągnięty zostanie koniec pliku, zwracana jst zmniejszona liczba elementów (lub zero).
The function fread() does not distinguish between end-of-file and er- ror, and callers must use feof and ferror to determine which oc- curred. The function fwrite () returns a value less than nmemb only if a write error has occurred.
