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Deleting Info from a txt file

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Deleting Info from a txt file
webmin
post 19 Jul, 2008 - 07:16 AM
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I've learned how to write info to a txt file, but now I'd like to learn how to remove that info from the txt file

(I'm too lazy to go to the root of my hard drive and open the file and delete it)

What's even worse is I have launchy where I hit alt + space and I could type in the location of the file and open that way, but nah I'd rather do straight from the program.

My question is basically this, I'd like for the program to list all the records (which I already know how to do)
and then I'd like to be able to select a record based on the row, and delete it or modify it.

I need this preferably in C. Thanks
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gabehabe
post 19 Jul, 2008 - 07:24 AM
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Dream.In.Code has a policy by which we prefer to see a good faith effort on your part before providing source code for homework assignments. Please post the code you have written in an effort to resolve the problem, and our members would be happy to provide some guidance. Be sure to include a description of any errors you are encountering as well.

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webmin
post 20 Jul, 2008 - 06:00 PM
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I'm sorry I want you to know that I'm not ignoring this post It's just that this was a little side project that I wanted to learn and I couldn't seem to find anything useful under google search using manipulating text files in C that seemed to describe what I wanted to do.

When I get more time, I'll see if I can play with my code a little and figure something close. Until then, if someone knows of a great resource that I could look at and point me in the right direction I'd be happy to take a look at it as long as it for C language.

Thanks.
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nirvanarupali
post 20 Jul, 2008 - 09:30 PM
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You want to delete something in the file or delete the file?

Just search in the C++ snippets.
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webmin
post 21 Jul, 2008 - 05:19 AM
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Something in the file...
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KYA
post 21 Jul, 2008 - 09:58 AM
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#include <nerd.h>

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This snippet will guide the way:

File workings

cplusplus.com also has a great section on FILE input/output
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Delta_Echo
post 21 Jul, 2008 - 10:03 PM
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you could take the contents of the file, read it to an array, remove what needs to be removed, then write the array back to the file after you wipe the file contents.
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webmin
post 24 Jul, 2008 - 04:21 PM
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QUOTE(Delta_Echo @ 22 Jul, 2008 - 01:03 AM) *

you could take the contents of the file, read it to an array, remove what needs to be removed, then write the array back to the file after you wipe the file contents.


That's perfect, because this is something I'll need to use in my next project. Can you point to a reference on how to do that? I've looked on cprogramming.com but I'm not really sure what to do here...
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Delta_Echo
post 24 Jul, 2008 - 10:17 PM
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Tutorials: (on C++ File I/O (Input/Output)
http://www.cplusplus.com/doc/tutorial/files.html
http://www.cprogramming.com/tutorial/lesson10.html
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Delta_Echo
post 24 Jul, 2008 - 11:37 PM
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Oh, if your just starting C+, i suggest you buy "C++ Without Fear". Its a great book.
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webmin
post 25 Jul, 2008 - 05:31 AM
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Again this is all great info, but I'm not onto learning C++ yet. I'm still learning C. If anyone knows of any resources that are written for C I'd appreciate it. Thanks.
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polymath
post 25 Jul, 2008 - 09:06 AM
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OK. IFF you want to read info into an array then rewrite it, you need to open it in truncation mode if you are using fstream with c++.


ofstream fout;
fout.open("file.txt", fstream::trunc);
//writing here overwrites the file
fout.close();
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