Read from a file to a string

[Buy2easy.com]

Hello I am new to C++ and i have the new visual c++ .net

i was woundering if someone could let me know a simple way to read from a *.txt file and put it into a string or a string array one line at a time. if someone could give me some sample code that would be great!

Thanks ahead of time

[RabidChimp]

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

using namespace std;


int main()
{
        ifstream fin;
        string Buffer;

        fin.open("FileName.txt");

        if(fin.fail())
       {
              cout << "Error Opening File\n"; //if the file is not found then display error and exit
              return 0;
       }
       
      while(getline(fin,Buffer))
      {
              cout << Buffer << "\n";    //reads through the file untill the end displaying everyline
      }
	  return 0;
}

Make sure that in the folder where u save tihs code is the txt file, just change where it says "FileName.txt" to the name of the file
This code will read through the file collecting every line and printing it.

Hope this helps

BTW im not sure if this will work with VC++.Net since i don't have it, but im guessing it should

[The Hobo]

Originally posted by Buy2easy.com
Hello I am new to C++ and i have the new visual c++ .net

i was woundering if someone could let me know a simple way to read from a *.txt file and put it into a string or a string array one line at a time. if someone could give me some sample code that would be great!

Thanks ahead of time

Do you search at all before you post? Check out the FAQ or do a search first. You'll be surprised at what you find, especially with a question like this.

[Arawn]

First off let me say I'm not trying to be rude or step on anyone's toes. But I've noticed this disturbing trend among forums lately where questions are repeatedly getting answered with "Do a search, read the FAQ". Most of these have rather unpleasant tones. Then when people do searches they end up with the first page being "do a search, read the FAQ" replies. Fortunately I haven't noticed it as bad here but just wanted to bring up the topic.

[The Hobo]

Originally posted by Arawn
First off let me say I'm not trying to be rude or step on anyone's toes. But I've noticed this disturbing trend among forums lately where questions are repeatedly getting answered with "Do a search, read the FAQ". Most of these have rather unpleasant tones. Then when people do searches they end up with the first page being "do a search, read the FAQ" replies. Fortunately I haven't noticed it as bad here but just wanted to bring up the topic.

Seeing someone ask "How do I make a message box?!" everyday gets a little monotonous.

The reason why I said what I said was because, about two posts down, I asked a question pertaining to nearly the same thing. Which pretty much goes to prove that he/she didn't look very much before they posted.

I'm sorry if I offended you. Perhaps you could ignore me in the future? Just for reference, there is an ignore option in your User CP. Feel free to use it.

[Jop]

Originally posted by RabidChimp

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

using namespace std;


int main()
{
        ifstream fin;
        string Buffer;

        fin.open("FileName.txt");

        if(fin.fail())
       {
              cout << "Error Opening File\n"; //if the file is not found then display error and exit
              return 0;
       }
       
      while(getline(fin,Buffer))
      {
              cout << Buffer << "\n";    //reads through the file untill the end displaying everyline
      }
  fin.close();
	  return 0;
}

In general it's a good idea to close the filestream also, especially when you have multiple files open.

[Buy2easy.com]

Thanks for your reply it helped me out a lot.......also how do i make a message box? Just kidding

[RabidChimp]

my bad i forgot to close it, *slaps himself*

[Buy2easy.com]

i have a small problem w/ this code...i used it as is to test it and i put a file in the directory of the *.exe file w/ the name filename.txt i even matched the text to exactly match what was posted i think it was FileName.txt. But it keeps giving me the error message like it can't read the file.....What could be wrong?

Thanks!

[RabidChimp]

What was the actuall error? Also Try putting the txt file where the .cpp file instead of in the Debug folder where the exe is.

[Buy2easy.com]

the error says that the file cannot be opened...not an error message but the build in message that displays when the file can not be opened or is not found (build into your code example)

why would it need to be in the dir w/ the .cpp file? just woundering? I will try it when i get home. and i wil get back w/U

[Buy2easy.com]

that fixed it! what is up w/ that why did it not need to be in the dir w/ the .exe?

[parksie]

When you run it direct from VC++, it changes the working directory to your project directory, *not* the output directory. This is so that you can use the same files with both debug and release versions.