Source: http://hi.baidu.com/kofeffect/blog/item/cd040c2b2979d8fee6cd40c4.html 1. Methods in MFC: (C ++) Cfilestatus status;
Cfile: getstatus ("D: \ test.txt", status );
Long lsizeoffile;
Lsizeoffile = status. m_size; The value of lsizeoffile is the size of the D: \ test.txt file. 2. Five methods for getting the file size from standard C
(Note: "_ file _" refers to the current file. You can change it to a target file in a valid path, such as "D: \ test.txt ")
# Include "stdafx. H"
# Include "stdio. H"
# Include <sys/STAT. h>
# Include <Io. h>
# Include <fcntl. h>
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;
} |
