如何从CString中仅提取数字 [英] How to extract only numbers from CString

问题描述

Hello All ..



在从CString中仅提取数字时遇到问题。我有一个像

的字符串示例1：CString cs =1697.7 ST 8.2 BIIU__LL 1697.60 1698.30

示例2：CString cs1 =16588 ST 78 BJ89__LL 1685.90 1623.87



我想从这个字符串中仅提取数字。输出如：

1697.7 8.2 1697.60 1698.30



如何实现这一点，请建议/指导我..





谢谢大家。

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.

推荐答案

您必须编写自己的解析器才能执行此操作。假设元素由空格分隔并且所有数字都是浮点数，这可以使用 strtod（）来完成：

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():

// 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;
        }
    }
}

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