C++ 读文件 将文件内容读入到字符串string中的方法

#include <string>#include <fstream>#include <sstream>#include <iostream> #include <stdlib.h>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(ch);//返回与流对象buf关联的字符串return buf.str();} int main(){//文件名char * fn="a.txt";string str;str=readFileIntoString(fn);cout<<str<<endl;system("pause"); }