Header File
stdio.h
Category
Input/output Routines
Prototype
size_t fread(void *ptr, size_t size, size_t n, FILE *stream);
Description
Reads data from a stream.
fread reads n items of data each of length size bytes from the given input stream into a block pointed to by ptr.
The total number of bytes read is (n * size).
Return Value
On success fread returns the number of items (not bytes) actually read.
On end-of-file or error it returns a short count (possibly 0).
Example
#include <string.h> #include <stdio.h> int main(void) { FILE *stream; char msg[] = "this is a test"; char buf[20]; if ((stream = fopen("DUMMY.FIL", "w+")) == NULL) { fprintf(stderr, "Cannot open output file.\n"); return 1; } /* write some data to the file */ fwrite(msg, strlen(msg)+1, 1, stream); /* seek to the beginning of the file */ fseek(stream, SEEK_SET, 0); /* read the data and display it */ fread(buf, strlen(msg)+1, 1, stream); printf("%s\n", buf); fclose(stream); return 0; }
Portability
POSIX |
Win32 |
ANSI C |
ANSI C++ |
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