How to extract only numbers from CString

Question

0.00/5 (No votes)

See more:

Hello All..

Am facing problem in extracting only numbers from CString. Am having a string like
Example 1: CString cs = "1697.7 ST 8.2 BIIU__LL 1697.60 1698.30 "
Example 2: CString cs1 = "16588 ST 78 BJ89__LL 1685.90 1623.87 "

And i want to extract only numbers from this string.Output like :
1697.7 8.2 1697.60 1698.30

How to achieve this, please suggest/guide me..

Thank you all.

Posted 11-Dec-12 20:19pm

Guru_C++

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Accepted Answer · 2012-12-11T21:29:00

You must write your own parser to do this. Assuming that the elements are separated by spaces and all numbers are floating point numbers, this can be done using strtod():

C++

// Get space separated floating point number as CString object.
// Empty string if not a floating point value.
// Returns pointer to next space, trailing NULL char, or NULL
LPCTSTR GetNumberStr(CString& str, LPCTSTR s) const
{
    while (*s <= _T(' '))
        ++s;
    LPTSTR lpszEnd;
    _tcstod(s, &lpszEnd);
    // Floating point or int value if conversion stopped at space or end of string
    if (*lpszEnd <= _T(' '))
        str.SetString(s, static_cast<int>(lpszEnd - s));
    else
    {
        str = _T("");
        // This may return NULL!
        lpszEnd = _tcschr(s, _T(' '));
    }
    return lpszEnd;
}

void Parse(CString& strOut, const CString& strIn) const
{
    strOut = _T("");
    LPCTSTR s = strIn.GetString();
    while (s && *s)
    {
        CString str;
        s = GetNumberStr(str, s);
        if (!str.IsEmpty())
        {
            if (!strOut.IsEmpty())
                strOut += _T(' ');
            strOut += str;
        }
    }
}