Reading and writing files

dixietomi

I call dos to generate a txt file, how to read a certain data
int main ()
{
   system ("dir e:\\>> 1.txt");
   system ("pause");
   return 0;
}

Generate a file as follows:
 The volume in drive E has no labels.
 The serial number of the volume is 2415-BC8C

 E:\'s directory

2006-12-30 14:45 0 1.txt
2006-12-30 14:38 <DIR> lrc
2006-12-17 19:58 <DIR> mhpa
2006-12-16 14:29 <DIR> netgame
2006-08-15 08:52 <DIR> soft
2006-06-15 13:05 <DIR> update
               1 file 0 bytes
               5 directories 918,061,056 bytes available

I want to call the byte "918,061,056" of the remaining disk space in another file. How can I achieve this?

wildsuns

Read file contents line by line
Use string manipulation to convert
Specifically continue to look at file pointers and string operations

dixietomi

Can you help me write a program example? I know it can be read line by line. But if I only want to take one of them, can I? consult! !!

orangedj

Get the last line, then skip whitespace and TAB

luhua325

what do you want to say

dixietomi

Can you write it? I wouldn't. I've looked for books, but I haven't touched on this issue. .

qingclie

Don't know to take the last line
Then atol

dixietomi

What is atol?
Can you explain it specifically?

ginor1979

It is estimated that the ultimate purpose of the landlord is to obtain the amount of free disk space. You can use other methods to get the properties of the disk.

dixietomi

Yeah, yeah, I found it, they taught me to use the API pipeline, but I have n’t read those books, I can replace it with what I will use now, and I will improve it in the future! !! But I can't make it with this now! !!