Read whole ASCII file into C std string

0 votes

I need to load an entire file into memory and store it in a C++ std::string.

If I read it into a char[,] the answer is straightforward:

std::ifstream t;
int length;
t.open("file.txt");      // open input file
t.seekg(0, std::ios::end);    // go to the end
length = t.tellg();           // report location (this is the length)
t.seekg(0, std::ios::beg);    // go back to the beginning
buffer = new char[length];    // allocate memory for a buffer of appropriate dimension
t.read(buffer, length);       // read the whole file into the buffer
t.close();                    // close file handle

// ... Do stuff with buffer here ...

Now, I want to do the exact same thing, but using a std::string instead of a char[]. I want to avoid loops, i.e. I don't want to:

std::ifstream t;
t.open("file.txt");
std::string buffer;
std::string line;
while(t){
std::getline(t, line);
// ... Append line to buffer and go on
}
t.close()

Any ideas?

Aug 23, 2022 in C++ by Nicholas
• 7,760 points
793 views

No answer to this question. Be the first to respond.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.

Related Questions In C++

0 votes
1 answer

What data structure is inside std::map in C++?

An associative container is std::map. The standard's ...READ MORE

answered May 31, 2022 in C++ by Damon
• 4,960 points
846 views
0 votes
1 answer

How to use std::sort to sort an array in C++

We receive std::begin and std::end in C++0x/11, which are overloaded for arrays: #include <algorithm> int main(){ int v[2000]; ...READ MORE

answered Jun 1, 2022 in C++ by Damon
• 4,960 points
1,144 views
0 votes
1 answer

str_lib_facilities.h file from Stroustrup's Programming: Principles and Practice Using C++ generating errors

Switching the compiler to compile in c++11 ...READ MORE

answered Jun 13, 2022 in C++ by Damon
• 4,960 points
1,028 views
0 votes
1 answer

outputting ascii table in C++

This line doesn't do the right thing: ch ...READ MORE

answered Jun 13, 2022 in C++ by Damon
• 4,960 points
1,058 views
0 votes
1 answer

Mac M1 C++20: Missing std::convertible_to and std::forward_iterator concepts

Clang from Homebrew is a good option (or compile one by yourself).  You may also look at the features that have been incorporated on Clang's official website. ❯ clang++ --version Homebrew clang version 13.0.0 Target: arm64-apple-darwin21.1.0 Thread ...READ MORE

answered Jun 14, 2022 in C++ by Damon
• 4,960 points
557 views
0 votes
1 answer

Easiest way to convert int to string in C++

std::stoi (and variations for each numeric type) ...READ MORE

answered Jun 15, 2022 in C++ by Damon
• 4,960 points
1,099 views
0 votes
1 answer

Easiest way to convert int to string in C++

The C++11 version has introduced the std::stoi ...READ MORE

answered Feb 10, 2022 in Others by Rahul
• 9,680 points
534 views
0 votes
1 answer

Easiest way to convert int to string in C++

C++ adds std::stoi (and variants for each numeric type) and std::to string, which are the C equivalents of atoi and itoa but expressed in terms of std::string #include <string> std::string s = std::to_string(42); Is therefore ...READ MORE

answered Jun 1, 2022 in C++ by Damon
• 4,960 points
1,406 views
0 votes
1 answer

How can I convert a std::string to int?

There are some new convert methods in C++ that convert std::string to a numeric type. As an alternative to str.c str() atoi(str.c str()) atoi(str.c str() you can make use of std::stoi std::stoi ...READ MORE

answered Jun 1, 2022 in C++ by Damon
• 4,960 points
704 views
0 votes
1 answer

How to reverse an std::string?

A reverse function is integrated into C++ and can be used to reverse a string.  This function accepts two parameters: The start iterator for the string The string iterator has come to an end. The following line of code demonstrates how to use this function: #include <iostream> //The library below must be included ...READ MORE

answered Jun 1, 2022 in C++ by Damon
• 4,960 points
546 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP