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出处：http://hi.baidu.com/kofeffect/blog/item/cd040c2b2979d8fee6cd40c4.html
1.MFC中的方法：(C++)
CFileStatus status;
CFile::GetStatus("D:\test.txt",status);
long lSizeOfFile;
lSizeOfFile = status.m_size;
lSizeOfFile的值就是D:\test.txt文件的大小
2.标准C获得文件大小的5种方法
(注意："FILE"指的是当前文件，你可以改为有效路径的目标文件，比如"D:\test.txt"）
#include "stdafx.h"
#include "stdio.h"
#include
#include
#include
int getfilesize()
{
int iresult;
struct _stat buf;
iresult = _stat(FILE,&buf);
if(iresult == 0)
{
return buf.st_size;
}
return NULL;
}
int getfilesize01()
{
int fp;
fp=_open(FILE,_O_RDONLY);
if(fp==-1)
return NULL;
return _filelength(fp);
//return NULL;
}
int getfilesize02()
{
int fp;
fp=_open(FILE,_O_RDONLY);
if(fp==-1)
return NULL;
return _lseek(fp,0,SEEK_END);
//return NULL;
}
int getfilesize03()
{
int fp;
fp=_open(FILE,_O_RDONLY);
if(fp==-1)
return NULL;
return _lseek(fp,0,SEEK_END);
//return NULL;
}
int getfilesize04()
{
FILE *fp;
if((fp=fopen(FILE,"r"))==NULL)
return 0;
fseek(fp,0,SEEK_END);
return ftell(fp); //return NULL;
}
int getfilesize05()
{
FILE *fp;
char str[1];
if((fp=fopen(FILE,"rb"))==NULL)
return 0;
for(int i = 0;!feof(fp);i++)
{
fread(&str,1,1,fp);
}
return i - 1; //return NULL;
}
int main(int argc, char* argv[])
{
printf("getfilesize()=%d\n",getfilesize());
printf("getfilesize01()=%d\n",getfilesize01());
printf("getfilesize02()=%d\n",getfilesize02());
printf("getfilesize03()=%d\n",getfilesize03());
printf("getfilesize04()=%d\n",getfilesize04());
printf("getfilesize05()=%d\n",getfilesize05());
return 0;
} | 
