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What is the best way to slurp a file into a std::string in c++?
Im trying to store a whole text file as a string, how can I dynamically store any amount of characters the text file may contain?
- What's the size of your file like? 20GB?P.P– P.P2012-11-05 22:08:33 +00:00Commented Nov 5, 2012 at 22:08
- 2possible duplicate of What is the best way to slurp a file into a std::string in c++? or What is the most elegant way to read a text file with c++Blastfurnace– Blastfurnace2012-11-05 22:10:29 +00:00Commented Nov 5, 2012 at 22:10
- @KingsIndian, Nothing more than a few kilobytestheUser– theUser2012-11-05 22:10:56 +00:00Commented Nov 5, 2012 at 22:10
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2 Answers
The C++ Standard Library provides the std::string type for dynamically sized strings. It is a typedef for std::basic_string<char>. There's a useful reference at cppreference.com.
For reading lines from a file into a std::string, take a look at std::getline. You can use it to get a line from a file as follows:
std::string str; std::getline(file_stream, str); Be sure to check the stream (it is returned by std::getline) to see if everything went okay. This is often done in a loop:
while (std::getline(file_stream, str)) { // Use str } 
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In addition to sftrabbit's answer:
Note that you can read a whole file into a string in one go by doing this:
std::ifstream input_ifstr(filename.c_str()); std::string str( (std::istreambuf_iterator<char>(input_ifstr)), std::istreambuf_iterator<char>()); input_ifstr.close(); You can construct a stringstream from it to process with getline afterwards if you wish.
