CODEWITHSUNDEEP
c++getlinestringstream
a_familiar_wolf
a_familiar_wolf

Reputation: 79

can't read from .txt file using istringstream

I'm trying to write a fairly basic program, that reads a .txt file using istringstream, but for some reason this code:

int main(int argc,char* argv[])
{
    std::string filename = "test.txt";
    std::stringstream file(filename);
    while (std::getline(file, filename))
    {
        std::cout << "\n" << filename;
    }
    return 0;
}

only prints:
test.txt

The file i'm trying to read is a .txt file named test.txt created by windows editor containg:
test1
test2
test3
I'm compiling with Visual Studio 2017.

Upvotes: 0

Views: 961

Answers (1)

Arnav Borborah
Arnav Borborah

Reputation: 11769

Assuming your goal was to read each of the entries in the file, you are using the wrong class. For reading from files, you need std::ifstream, and would use it as follows:

#include <iostream>
#include <fstream>
#include <string>

int main(int argc,char* argv[])
{
    std::string filename = "test.txt";
    std::ifstream file(filename);
    if (file.is_open())
    {
        std::string line;
        while (getline(file, line))
        {
            std::cout << "\n" << line;
        }
    }
    else
    {
        // Handling for file not able to be opened
    }
    return 0;
}

OUTPUT:

<newline>
test1
test2
test3

Live Example

std::stringstream is used for parsing strings, not files.

Upvotes: 3

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