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C++ string功能补充（类型互转，分割，合并，瘦身）
int StringUtil::intFromString(string data)
{//NOTE atoi是非标准C函数
return atoi(data.c_str());
}
string StringUtil::stringFromInt(int data)
{char tmp[11];
memset(tmp,0,11);
sprintf(tmp,"%10d",data);
return string(tmp);
}
double StringUtil::doubleFromString(string data)
{double tmp;
sscanf(data.c_str(),"%lf",&tmp);
return tmp;
}
string StringUtil::stringFromDouble(double data)
{char tmp[21];
memset(tmp,0,21);
sprintf(tmp,"%20.3lf",data);
return string(tmp);
}
float StringUtil::floatFromString(std::string data)
{float tmp;
sscanf(data.c_str(),"%f",&tmp);
return tmp;
}
std::string StringUtil::stringFromFloat(float data)
{char tmp[21];
memset(tmp,0,21);
sprintf(tmp,"%20.3f",data);
return string(tmp);
}
bool StringUtil::boolFromString(std::string data)
{ if(data.compare("true") == 0)return true;
else
return false;
}
std::string StringUtil::stringFromBool(bool data)
{if(data)
return string("true");else
return string("false");}
vector<std::string> StringUtil::splitStringToArray(std::string source, std::string seperator)
{vector<string> result;
if(!source.empty())
{string::size_type begin = 0;
string::size_type end = 0;
unsigned int sepSize = seperator.size();
while((end = source.find_first_of(seperator,begin))!=string::npos)
{string item = source.substr(begin,end-begin);
result.push_back(item);
begin=end + sepSize;
}
//last item,注意如果最后是分割符，则最后的元素为空字符串
if(begin <= source.size())
{string item = source.substr(begin,source.size() - begin);
result.push_back(item);
}
}
return result;
}
std::string StringUtil::linkArrayToString(vector<std::string> array, std::string seperator)
{string result;
if(array.size() > 0)
{unsigned int limit = array.size() - 1;
for(unsigned int i=0;i< limit;++i)
{result+=array[i];
result+=seperator;
}
result += array[limit];
}
return result;
}
map<std::string, std::string> StringUtil::splitStringToMap(std::string source, std::string primarySep, std::string secondarySep)
{vector<string> array = StringUtil::splitStringToArray(source,primarySep);
vector<string> tmpArray;
map<string,string> result;
for(unsigned int i = 0; i< array.size();++i)
{tmpArray = StringUtil::splitStringToArray(array[i],secondarySep);
if(tmpArray.size() >= 2)
{result[tmpArray[0]] = tmpArray[1];
}
}
return result;
}
std::string StringUtil::linkMapToString(map<std::string, std::string> tmpMap, std::string primarySep, std::string secondarySep)
{vector<string> tmpArray;
string tmpStr;
map<string,string>::iterator it = tmpMap.begin();
for(;it!=tmpMap.end();++it)
{tmpStr = it->first+secondarySep+it->second;
tmpArray.push_back(tmpStr);
}
return StringUtil::linkArrayToString(tmpArray,primarySep);
}
std::string StringUtil::trimFront(std::string data)
{unsigned int i = 0;
for(;i<data.size()&&data.at(i)==‘ ‘;++i)
{}
if(i<data.size())
return data.substr(i,data.size()-i);
else
return string("");}
std::string StringUtil::trimBack(std::string data)
{int i = data.size()-1;
for(;i>=0&&data.at(i)==‘ ‘;--i)
{}
if(i>=0)
return data.substr(0,i+1);
else
return string("");}
std::string StringUtil::trim(std::string data)
{string tmp = StringUtil::trimFront(data);
return StringUtil::trimBack(tmp);
}
C++ string功能补充（类型互转，分割，合并，瘦身）
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