實戰c++中的string系列--std:vector 和std:string相互轉換(vector to stringstream)

string、vector 互轉

string 轉 vector

vector  vcBuf;
string        stBuf("Hello DaMao!!!");
----------------------------------------------
vcBuf.resize(stBuf.size());
vcBuf.assign(stBuf.begin(), stBuf.end());

 

vector 轉 string 

stBuf.clear();
stBuf.assign(vcBuf.begin(), vcBuf.end());

 

實戰c++中的string系列--std:vector 和std:string相互轉換(vector to stringstream)

有時候也會遇到std:vector與轉std:string 相互轉換的情況。

首先看一下vector<char>如何轉string：

std::vector<char> *data = response->getResponseData(); std::string res; //方法一 for (int i = 0;i<data->size();++i) { res+=(*data)[i]; } res+='\0'; std:cout << res; //方法二 std::vector<char> *data = response->getResponseData(); std::string res; res.insert(res.begin(), data->begin(), data->end()); std::cout << res; //方法三 std::vector<char> *data = response->getResponseData(); std::string res; const char* s = &(*data->begin()); res = std::string(s, data->size()); std::cout << res; //方法四 string ch = "what a fucking day!"; vector <char> ta; ta.resize(ch.size()); ta.assign(ch.begin(),ch.end());

string 轉vector就會更容易：

vector <char> ta = {‘a’, 'b', 'c'};
ch.clear();
ch.assign(ta.begin(),ta.end());

================================================================ 
vector to stringstream

#include <iostream> #include <sstream> #include <vector> #include <string> #include <iterator> // Dummy std::vector of strings std::vector<std::string> sentence; sentence.push_back("aa"); sentence.push_back("ab"); // Required std::stringstream object std::stringstream ss; // Populate std::copy(sentence.begin(), sentence.end(),std::ostream_iterator<std::string>(ss,"\n")); // Display std::cout<<ss.str()<<std::endl;