如下所示：
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <stdlib>
using namespace std;
//从文件读入到string里
string readFileIntoString(char * filename)
{
ifstream ifile(filename);
//将文件读入到ostringstream对象buf中
ostringstream buf;
char ch;
while(buf&&ifile.get(ch))
buf.put
