Read binary data from a stream.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <stdio.h>

size_t fread(void *ptr, size_t size, 

Parameters for this facility are:

ptr	void *	A pointer to the read destination
size	size_t	The size of the array pointed to
nmemb	size_t	Number of elements to be read
stream	FILE *	A pointer to a FILE stream

The fread() function reads a block of binary or text data and updates the file position indicator. The data read from stream are stored in the array pointed to by ptr. The size and nmemb arguments describe the size of each item and the number of items to read, respectively.

The fread() function reads nmemb items unless it reaches the end-of-file or a read error occurs.

If the file is opened in update mode (+) a file cannot be read from and then written to without repositioning the file using one of the file positioning functions (fseek(), fsetpos(), or rewind()) unless the last read or write reached the end-of-file.

Return

fread() returns the number of items read successfully.

"Wide Character and Byte Character Stream Orientation"

"fgets"

"fwrite"

#include <stdio.h>
#include <stdlib.h>


// define the item size in bytes
#define BUFSIZE  40

int main(void)
{
	FILE *f;
	static char s[BUFSIZE] = "The quick brown fox";
	char target[BUFSIZE];
	
	// create a new file for output and input
	if (( f = fopen("foo", "w+")) == NULL) {	
		printf("Can't create file.\n");
		exit(1);
	}
	
	// output to the stream using fwrite()
	fwrite(s, sizeof(char), BUFSIZE, f);

	// move to the beginning of the file
	rewind(f);

	// now read from the stream using fread()
	fread(target, sizeof(char), BUFSIZE, f);
	
	// output the results to the console
	puts(s);
	puts(target);

	// close the file
	fclose(f);
	
	return 0;
}
Output:
The quick brown fox
The quick brown fox





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Last updated: August 16, 2000