c++中文件操作的问题

Question

• 我已经写了一个补丁来写文件和它的工作

//To write a file from this location 
std::ofstream myfile; 
myfile.open("warn_sen.txt"); 
myfile << "IT HITS HERE = " "n"; 
myfile.close();

• 但是读操作失败，说明没有转换支持。

//To read a file from this location 
std::ifstream evadefile;
evadefile.open("evade_sen.txt");
string flag_01 =  evadefile;
evadefile.close();

ERROR - E0312没有合适的用户定义转换"std::ifstream";std:: string"存在

请同样帮助我，非常感谢。

Answer 1

如果您想将整个文件读取为字符串，您可以执行以下操作:

std::ifstream evadefile;
evadefile.open("evade_sen.txt");
string flag_01(std::istreambuf_iterator<char>{evadefile}, {}); // in header <iterator>
evadefile.close(); // By the way, you can also omit this line if you are going to work only with this file using the ifstream, because of RAII