用fseek和ftell获取文件的大小

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

int main(int argc,char *argv[])

{

    int n=0;

    FILE *fp;

    if((fp=fopen(argv[1],"r"))==NULL)

    {

        perror("fopen");

        exit(EXIT_FAILURE);

    }

    if(fseek(fp,0,SEEK_END)!=0)

    {

        perror("fseek");

        exit(EXIT_FAILURE);

    }

    if((n=ftell(fp))==-1)

    {

        perror("ftell");

        exit(EXIT_FAILURE);

    }

    printf("the size counted by fseek/ftell of the file is %d \n",n);

    printf("this is ls output:\n");

    execl("/bin/ls","ls","-l",argv[1],(char *)0);

    fclose(fp);

}

在Ubuntu中运行结果

用fseek和ftell获取文件的大小,布布扣,bubuko.com