c语言获取文件长度的方法

#include<stdio.h>

int GetFileLen(unsigned char * FileName)

{

FILE * file;

int len = 0;

file = fopen(FileName, "r");

fseek(file, 0L, SEEK_END);

len = ftell(file);

fseek(file, 0L, SEEK_SET);

return len;

}