如何得到文件大小？

[anglely168]

我用fseek(fp,SEEK_END,SEEK_SET) or fseek(fp,SEEK_SET,SEEK_END)都不行！请教大家了！

[zhengguoshan]

好像有这个函数自己去查吧。。

[huangwu007]

FILE* m_Handle;
struct stat buf;
m_Handle = fopen(...);

#ifdef VC
fstat(m_Handle->_file,&buf);
#else
#ifdef _SOLARIS
fstat(m_Handle->_file,&buf);
#else
#ifdef _REDHAT
fstat(m_Handle->_fileno,&buf);
#else
#ifdef _FreeBSD44
fstat(m_Handle->_file,&buf);
#else
fstat(m_Handle->fd,&buf);
#endif
#endif
#endif
#endif

buf.st_size就是文件的大小了

[zhanghk]

c: _filelength
API: GetFileSize

[blue_coco]

纯C

fp = fopen(...);
size = ftell(fp);

[zxm954712]

fseek是可以得，不过麻烦一点啊
下面是个例子，你看一下巴
#include <stdio.h>

long filesize(FILE *stream);

int main(void)
{
FILE *stream;

stream = fopen("MYFILE.TXT", "r");
printf("Filesize of MYFILE.TXT is %ld bytes\n", filesize(stream));
fclose(stream);
return 0;
}

long filesize(FILE *stream)
{
long length;

fseek(stream, 0L, SEEK_END);
length = ftell(stream);
printf("%ld\n", length);
return length;
}

[jyc_nj]

ifstream fin(strFileName);
fin.seekg(-1, ios::end);
m_nFileSize = fin.tellg();