c 取文件长度.

c 取文件长度.

#include <sys/stat.h>

long file_length(char *f)

{

    struct stat st;

    stat(f, &st);

    return st.st_size;

}

If you have the file stream (FILE * f):

fseek(f, 0, SEEK_END); // seek to end of file

size = ftell(f); // get current file pointer

fseek(f, 0, SEEK_SET); // seek back to beginning of file

// proceed with allocating memory and reading the file

Or,

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

fd = fileno(f); 

struct stat buf;

fstat(fd, &buf);

int size = buf.st_size;

Or, use stat, if you know the filename:

#include <sys/stat.h>

struct stat st;

stat(filename, &st);

size = st.st_size;