stl string 使用

stl string 使用

1. 查找字符

std::wstring  strData = L"<result>[北京市, 上海市, 深圳市]</result>"

void DoF(const std::wstring &strData, std::list<std::wstring>& listDo)

{

    std::wstring strTarB = L"<result>[";

    std::wstring strTarE = L"]</result>";

 

    std::wstring::size_type nBeginTempB = 0, nEndTempB = 0, nBeginTempE = 0, nEndTempE = 0;

   

    nEndTempB = strData.find(strTarB, nBeginTempB);

    nEndTempE = strData.find(strTarE, nBeginTempE);

 

    if(nEndTempB != std::wstring::npos && nEndTempE != std::wstring::npos && nEndTempE > nEndTempB + strTarB.length())

    {

        std::wstring strTemp = strData.substr(nEndTempB + strTarB.length(), nEndTempE -  nEndTempB - strTarB.length());

        std::wstring strSub;

        strTemp += L",";

 

        std::list<std::wstring>::iterator it;

        listDo.clear();

        std::wstring::size_type nBegin = 0, nEnd = 0;

        while( (nEnd = strTemp.find(L",", nBegin)) != std::wstring::npos)

        {

            strSub = strTemp.substr(nBegin, nEnd - nBegin);

            if(strSub.length() > 0)

            {

                listDo.push_back(strSub);

            }

            nBegin = nEnd + 1;

        }

    }

}

2. 替换字符串

stl 中的string只是提供了按照位置和区间的replace函数，而不能用一个string字串来替换指定string中的另一个字串.

void string_replace(std::string& strBig, const std::string & strsrc, const std::string &strdst)

{

     std::string::size_type pos = 0;

     while( (pos = strBig.find(strsrc, pos)) != string::npos)

     {

         strBig.replace(pos, strsrc.length(), strdst);

         pos += strdst.length();

     }

}

// 使用

std::string strinfo= "This is Winter, Winter is a programmer. Do you know Winter?";

// 把strinfo中的所有"Winter" 替换为"wende"

string_replace(strinfo, "Winter", "wende");