c语言中文件的读写、fp位置操作

#include <stdio.h>

#include <stdlib.h>

int main()
{
FILE *file;
file = fopen("./text","rb");

//获取文件长度
fseek(file,0,SEEK_END);
int tell_len = ftell(file);
fseek(file,0,SEEK_SET);

char *buff = (char *)mem_get(char,tell_len+1);
int read_len = fread(buff,len,1,file);
printf("read file len = %d\n",file);

//从文件中间读取1024个字节
int pos = tell_len/2;
fseek(file,pos,SEEK_SET);
char buf[1025] = "\0";
int len = freadd(buf,1024,1,file);

printf("buf = %s\n",buf);
return 0;

}