Re: Converting a substring to Integer

From:

James Kanze <james.kanze@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Wed, 6 Feb 2008 02:44:49 -0800 (PST)

Message-ID:

<18090f39-c6d8-4a83-9571-c91a498c54af@d70g2000hsb.googlegroups.com>

On Feb 5, 5:03 pm, sparkydarky <markdueck...@gmail.com> wrote:

I have a bunch of strings in a database that have in them a
number I want to extract. Here's the example code I've been
working with:

                AnsiString tmp = "AMjsdfdsdfj 457756 some description";
                int firstDelim = 0;
                int secondDelim = 0;

                for(int i=0; i<=tmp.Length(); i++)
                {
                        if(IsDelimiter(" ", tmp, i));
                        {
                                if ( firstDelim == 0 )
                                        firstDelim = i;
                                else
                                {
                                        secondDelim = i;
                                        break;
                                }
                        }
                        if ( secondDelim > 0 )
                        break;
                }
                int str_length = secondDelim - firstDelim;
                ShowMessage(tmp.SubString(firstDelim, str_length));

Can someone give me a hint how to get this to work?

Not unless you give us a hint about the format of the string,
and what determines where you want to look to find the number.

Is my code way off, or is there a better way to do it?

Probably. Most of the time, for this sort of thing,
boost::regex is the simplest solution. Of course, once you've
got the numeric field, you'll have to use std::istringstream to
convert it.

--
James Kanze (GABI Software) email:james.kanze@gmail.com
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