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fread

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

Copy Code

    #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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