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Apr 17th, 2009

Config file read from '=' sign

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Ok I need to know how to set my class to read only the values after the = sign.

Here's my class so far.

C++ Syntax (Toggle Plain Text)
 
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
 
class Config
{
	int pos;
	string search;
public:
	char * confname;
	void configsearch ()
	{
		fstream filename (confname);
		while (!filename.eof())
		{
badsearch:
			getline (filename,search);
		pos = search.find("#");
			if (pos != -1)
			{
				goto badsearch;
			}
			cout << search;
			pos = search.find("=");
			if (pos != -1)
			{
				cout << "\n" << pos;
			}
			cout << "\n";
		}
	};
};
#include <iostream>
#include <string>
#include <fstream>
using namespace std;

class Config
{
	int pos;
	string search;
public:
	char * confname;
	void configsearch ()
	{
		fstream filename (confname);
		while (!filename.eof())
		{
badsearch:
			getline (filename,search);
		pos = search.find("#");
			if (pos != -1)
			{
				goto badsearch;
			}
			cout << search;
			pos = search.find("=");
			if (pos != -1)
			{
				cout << "\n" << pos;
			}
			cout << "\n";
		}
	};
};

Last edited by kelechi96; Apr 17th, 2009 at 1:17 pm.

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kelechi96

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Apr 17th, 2009

Re: Config file read from '=' sign

Look at the code here:

(Toggle Plain Text)

if (pos != -1)
{
	goto badsearch;
}

I think you meant:

(Toggle Plain Text)

if (pos == -1)
{
	goto badsearch;
}

Another thing is that string::search() returns string::npos if the search function does not find what it was told to find, and not -1, so the code should be:

(Toggle Plain Text)

if (pos == string::npos)
{
	goto badsearch;
}
cout << search;
pos = search.find("=");
if (pos != string::npos)
{
	cout << "\n" << pos;
}

And one last thing: you can avoid using goto in your 'if' statement by replacing it with the statement continue; - this will jump to the beginning of the while loop:

(Toggle Plain Text)

if (pos == string::npos)
{
	continue;
}

Last edited by unbeatable0; Apr 17th, 2009 at 1:57 pm.

unbeatable0

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Apr 17th, 2009

Re: Config file read from '=' sign

^ nice answer.

except one thing needs a bit stronger emphasis.

never, ever use "GOTO" this is not BASIC programming. You will be tarred and feathered.

(there may be an exception to the absolute ban on using GOTO, but that's not available until you reach Level 70.)

jephthah

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Posting Maven

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Apr 17th, 2009

Re: Config file read from '=' sign

>except one thing needs a bit stronger emphasis.
>never, ever use "GOTO" this is not BASIC programming.
Note to the OP: Avoid listening to programming advice that says you absolutely must or must not do something.

Narue

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Apr 17th, 2009

Re: Config file read from '=' sign

my question still hasn't been awnsered i want to read from an equals sign in my configuration file how do i do that

kelechi96

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Apr 17th, 2009

Re: Config file read from '=' sign

Quote ...

Avoid listening to programming advice that says you absolutely must or must not do something.

Good metaprogramming advice

Never forget to declare C++ variables before...
To ignore or not to ignore?

Is it an advice or a requirement? Where is the border?...

ArkM

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Postaholic

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Apr 17th, 2009

Re: Config file read from '=' sign

>Where is the border?...
Common sense, of course. Note that I said "avoid listening to" and not "never listen to".

The whole reason we have this "goto is teh EBIL!!!!!" crap is because a bunch of people were mindlessly following orders rather than thinking for themselves.

Narue

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Apr 17th, 2009

Re: Config file read from '=' sign

A. Whats wrong with goto
B. still dosn't awnser my origonal question

kelechi96

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Apr 17th, 2009

Re: Config file read from '=' sign

>A. Whats wrong with goto
Nothing. The problem is people using it in an undisciplined way such that the code becomes an unruly mess where control flow is difficult to follow.

>B. still dosn't awnser my origonal question
Be patient. When someone is ready to give you an answer, you'll get it. I notice you didn't even bother to thank unbeatable for taking the time to help you. Did you make the suggested changes?

Narue

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Apr 17th, 2009

Re: Config file read from '=' sign

unbeatable thanks for taking your time to awnser me however firstly I didn't realy need to change my != to == because it was supposed to go to the next line if it found a '#' because '#' is a comment sign and I changed goto to continue i don't know how it will affect execution time but realy execution time isn't realy an issue in this project

kelechi96

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