Ofstream, Ifstream, Searching files for strings?

**Zeusbwr** · 04-04-2005

Originally Posted by quzah

So I'm supposed to teach people basic logic skills now? That's right, most people can't think for themselves. I keep forgetting that, as I don't seem to have that problem.

Read a line from a file.
Parse the line.
Do whatever.
Lather.
Rinse.
Repeat.

Or is that too cryptic too?

Quzah.

Well couple of comments on this,
A: Sorry if my ways are unconventional, its been a while since i have been immersed in coding (i'v been teach myself 3d modeling lol), that and i have different habits from script kiddie languages that gave me many prebuilt packages.

I became very in depth at using the "packages" to their full potential and i'm still getting the grasps of breaking bad habits and thinking outside of my box.

B: this goes back to my script kiddie packaging, but i am used to dealing with structures as a whole. And due to how i came about learning C++ (via a c++/opp learning book, not specifically the tools and commands associated with ansi c++), i tend to (consciously or unconsciously) stick within my happy place.

C: In response to Lithorien,
Thats a good idea, the file sizes are plenty small enough i am sure. (Were talking a matter of under 50 lines of 30ish characters... and thats most likely being generous)

Originally Posted by quzah

Read a line from a file.
Parse the line.
Do whatever.
Lather.
Rinse.
Repeat.

And lastly, if quzah wouldn’t mind a response with the flaming kept to a minimum (not that you already havent i am sure lol)

Seeing as i may be needing any line/item at any time, and that i would like to keep the file system dynamic enough that i don’t have to simply loop through my file and put each value into a predefined variable. How about would that work? I am in no means trying to start some flameish ..........fest, i am being serious. (god forbid i try to learn from people who know more than i)

I could easily get away with, and most likely will, put the file into a string, then just pull my values out in a parsing manner on the fly.
I am just curious if there is something i am missing. As always, any replies (pertaining to the questions at hand) are always welcome and much appreciated.

Thanks for everyone’s posts

**Lithorien** · 04-04-2005

Originally Posted by Zeusbwr

Thats a good idea, the file sizes are plenty small enough i am sure. (Were talking a matter of under 50 lines of 30ish characters... and thats most likely being generous)

This seems like the best way, then. You'd only have one read/write operation through the course of the program, unless you needed to check for updates of the file. In that case, you can write a function that returns the string to main() (or wherever) and work with it that way.

In either case, the string seems easiest for the size of your file.

Seeing as i may be needing any line/item at any time, and that i would like to keep the file system dynamic enough that i don’t have to simply loop through my file and put each value into a predefined variable. How about would that work?

You would run through a while() loop, and use std::getline to pull out one line at a time from the file. Then use the s.find() method I was talking about before on just that line, or, conversely, do string comparison in another for() loop that creates a new char[X] to pull X letters from the string and do a strcmp() at the end.

That may have been confusing, so here's some sample code..

Code:

#include <iostream>

int main()
{
	while (!file.eof()) // This is horrible. See the cprogramming FAQ on better methods! -Lith
	{
		std::getline(cin, buffer, '\n');
		
		char *c = new char[SIZE_OF_WORD_YOU_WANT];
		
		for (int x = 0; x < SIZE_OF_WORD_YOU_WANT; x++)
		{
			c[x] = buffer[x];
		}
	}
	
	std::cin.get();
	return(0);
}

Your code will, of course, use what you need.

Hope this helps!

Thread: Ofstream, Ifstream, Searching files for strings?

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