【C++】读写文件

#include <fstream>
#include <string>
using namespace std;

int main()
{  
    // 读文件, 保存至fileContent中
    string openFile = "C:\\1.txt";
    ifstream inf;
    inf.open(openFile.c_str(), ios::in);
    string lineContent;
    string fileContent;
    while (getline(inf, lineContent))
    {
        fileContent += lineContent +'\n';
    }
    inf.close();

    //写文件
    string outFile = "C:\\2.txt";
    ofstream of(outFile.c_str());
    of << fileContent <<endl;
    of.close();

    return 0;
}

来自C++ Primer 的读文件方法：

#include <iostream>
#include <vector>
#include <sstream>
#include <fstream>
using namespace std;
 int FileToVector(string & fileName, vector<string> &val)
 {
        ifstream input(fileName.c_str());
        if (!input)
        {
            return -1;
        }
        string line;
        while(getline(input, line))
        {
            val.push_back(line);
        }
        input.close();
        return 0;
 }
int main(int argc, const char * argv[])   
{
    string path = "C:\\test.txt";
    vector<string> g_val;
   FileToVector(path, g_val);
   string word;
   stringstream ss;
   for (vector<string>::iterator iter = g_val.begin(); iter != g_val.end();iter++)
   {
       ss.str(*iter);
       while(ss >> word)
       {
           cout<<word<<" ";
       }
       cout<<endl;
       ss.clear();
   }
    return 0;
}