C++ 常见字符处理收录

1.string字符串删除字符串中指定字符

std::string& HTTPRequestHandlerImpl::replace_all_distinct(std::string& str, const std::string& old_value, const std::string& new_value)

        {

            for (string::size_type pos(); pos != string::npos; pos += new_value.length())

            {

                if ((pos = str.find(old_value, pos)) != string::npos)

                {

                    str.replace(pos, old_value.length(), new_value);

                }

                else  { break; }

            }

            return   str;

        }

eg:  replace_all_distinct(strring("abcde"), "cd", "dc");

res: abdce

2.string 字符串转换 utf-8编码

std::string string_To_UTF8(const std::string & str)

{

int nwLen = ::MultiByteToWideChar(CP_ACP, , str.c_str(), -, NULL, );  

wchar_t * pwBuf = new wchar_t[nwLen + ];

ZeroMemory(pwBuf, nwLen *  + );  

::MultiByteToWideChar(CP_ACP, , str.c_str(), str.length(), pwBuf, nwLen);  

int nLen = ::WideCharToMultiByte(CP_UTF8, , pwBuf, -, NULL, NULL, NULL, NULL);  

char * pBuf = new char[nLen + ];

ZeroMemory(pBuf, nLen + );  

::WideCharToMultiByte(CP_UTF8, , pwBuf, nwLen, pBuf, nLen, NULL, NULL);  

std::string retStr(pBuf);  

delete []pwBuf;

delete []pBuf;  

pwBuf = NULL;

pBuf = NULL;  

return retStr;

}  

std::string UTF8_To_string(const std::string & str)  
{  
int nwLen = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, NULL, 0);  
  
wchar_t * pwBuf = new wchar_t[nwLen + 1];
memset(pwBuf, 0, nwLen * 2 + 2);  
  
MultiByteToWideChar(CP_UTF8, 0, str.c_str(), str.length(), pwBuf, nwLen);  
  
int nLen = WideCharToMultiByte(CP_ACP, 0, pwBuf, -1, NULL, NULL, NULL, NULL);  
  
char * pBuf = new char[nLen + 1];  
memset(pBuf, 0, nLen + 1);  
  
WideCharToMultiByte(CP_ACP, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);  
  
std::string retStr = pBuf;  
  
delete []pBuf;  
delete []pwBuf;  
  
pBuf = NULL;  
pwBuf = NULL;  
  
return retStr;  
}

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C++ 常见字符处理收录

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