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  #1  
Old 11-Jul-2008, 09:33
ForeverYoung ForeverYoung is offline
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Help with adding details to a file

Hi all, I need some help with c++ .txt files, I just need a general description of how should I go about doing what I need to do...

Sample txt file:
Code:
11/11/2008
<record1>
<record2>
<record3>

After processing it, I need to add details at the back of the records like so:
Sample txt file:
Code:
11/11/2008
<record1><extra details>
<record2><extra details>
<record3><extra details>

How do I go about doing this?
  #2  
Old 11-Jul-2008, 09:48
davekw7x davekw7x is offline
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Re: Help with adding details to a file

Quote:
Originally Posted by ForeverYoung
... I just need a general description...

Here's how I might approach it:
Code:
1. Open the original file for reading.

2. Create (open) a brand new file for writing.

3. Perform the following for each line in the input file:
     Read the line from the input file
     Make changes/additions to the line's contents
     Write the altered line to the output file

4. Close the input file and output file.

5. Rename the original input file to something else.
     That means that your original file has been backed up.

6. Rename your output file so that it has the same name
   as your original input file.

Regards,

Dave
  #3  
Old 11-Jul-2008, 10:14
ForeverYoung ForeverYoung is offline
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Re: Help with adding details to a file

Cool, I was thinking along the same lines as that, I wanted to get a second opinion in case my way was wrong.

Also, let's say my output file has to be the same name as my original input file and I do not need to keep a copy of the original input file:

Step 1- Read in original file (sample.txt)
Step 2- Produce file with extra details (temp.txt)
Step 3- Rename temp.txt to sample.txt

Is there code/way to rename temp.txt to sample.txt? I confess I do not know how to do it
  #4  
Old 11-Jul-2008, 12:05
dlp dlp is offline
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Re: Help with adding details to a file

An old C function called Rename:

http://www.cplusplus.com/reference/c...io/rename.html
  #5  
Old 11-Jul-2008, 20:33
ForeverYoung ForeverYoung is offline
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Re: Help with adding details to a file

Boy that's a very cool function!

And one last question, what code should I use if I want to completely delete a .txt file?
  #6  
Old 11-Jul-2008, 20:44
davekw7x davekw7x is offline
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Re: Help with adding details to a file

Quote:
Originally Posted by ForeverYoung
...what code should I use if I want to completely delete a .txt file?

I respectfully suggest you get a book or find an on-line reference to standard C library functions. Dlp gave one possibility; here's another: http://www.cppreference.com/

Click on the link Standard C I/O

There is a list of all of the functions in the standard C I/O library. Do you see "remove?"

I mean, it's always OK to ask, but wouldn't you like to find out how to learn these things yourself?

Regards,

Dave
  #7  
Old 14-Jul-2008, 08:45
ForeverYoung ForeverYoung is offline
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Re: Help with adding details to a file

I'm sorry ><, I used cplusplus.com but I couldn't find that "remove" function, I was looking out for something like "delete" or "destroy" =x

Anyhow, thanks guys
 
 
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