提取标签之间的CString [英] Extract CString between tags

问题描述

如何在两个标签之间提取CString?

How can I extract a CString between two tags ?

 <tag1>My Text</tag1>

我不想计算开始和结束位置，然后使用Mid，也许还有另一种使用STL的简便方法?

I don't want to calculate the start and end position then use Mid, maybe there is another easier method using STL ?

推荐答案

免责声明:以下想法是不能在生产代码中使用.我假设您只是想快速进行测试.

Disclaimer: the following idea is bad and should not be used in production code. I'm assuming you just want a quick hack for testing.

使用正则表达式匹配标签. Microsoft在CAtlRegExp中提供了此功能.如果您使用的是Visual Studio 2008或更高版本，请在此处下载ATL .然后，只需在下面的代码中提供myString:

Use a regular expression to match the tags. Microsoft provides this in CAtlRegExp. If you're using Visual Studio 2008 or newer, download ATL here. Then, just provide myString to the code below:

#include "atlrx.h"
CAtlRegExp<> regex;
VERIFY( REPARSE_ERROR_OK == regex.Parse("<tag1>(.*)</tag1>") );

CAtlREMatchContext<> mc;
if (!regex.Match(myString, &mc)) {
    // no match found
} else {
    // match(es) found
    for (UINT nGroupIndex = 0; nGroupIndex < mc.m_uNumGroups; ++nGroupIndex) {
        const CAtlREMatchContext<>::RECHAR* szStart = 0;
        const CAtlREMatchContext<>::RECHAR* szEnd = 0;
        mc.GetMatch(nGroupIndex, &szStart, &szEnd);
        ptrdiff_t nLength = szEnd - szStart;
        CString text(szStart, nLength);
        // now do something with text
    }
}

免责声明2:您确实应该使用 XML解析器库.

Disclaimer 2: You really should use an XML parser library instead.

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