[RESOLVED] Simply reading txt file - oddly not working

[jacobis]

I've tried reading a file several different ways. I get nothing every time. The code seems exactly right.

Read a file >> print the text.
Simple.
I've written similar code.... what am I missing guys?

(I have the text file in the solution dir, and the project dir - pretty sure i just need it in the project dir? but i wasn't sure - c++ AND VS n00b )

I've also tried using a whole pathname to read the text file. I get nothing.

Here's my brilliant code :

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//

#pragma once

#include "targetver.h"

#include <stdio.h>
#include <tchar.h>

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

--------

// test.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
string str;
ifstream in("test.txt", ios::in);
in.open("test.txt");
getline(in, str);

cout << str << endl;

in.close();

return 0;
}



jacobi

[Khiem]

Try this
while(in>>str)
{
//do something with str
}

[Philip Nicoletti]

ifstream in("test.txt", ios::in);

The above line opens the file test.txt for reading

in.open("test.txt");

That line attempts to open the file test.txt for reading. Since it
is already open, the statement fails. This sets the streams state
to "bad", so any attempt to read from the stream fails.

Just remove the open line.

[jacobis]

Try this
while(in>>str)
{
//do something with str
}

This doesn't change the fact that it won't read my text file.

it should at least give the first word before the whitespace delimiter. But it doesn't.

If it's reading the file, it's not outputting what I stored in str.

[jacobis]

ifstream in("test.txt", ios::in);

The above line opens the file test.txt for reading

in.open("test.txt");

That line attempts to open the file test.txt for reading. Since it
is already open, the statement fails. This sets the streams state
to "bad", so any attempt to read from the stream fails.

Just remove the open line.

I have removed in.open();

Still no output.... i think it's an error with my getline(); statement

[Lindley]

Wrap an if statement around the getline() call to test whether or not it succeeds.

[jacobis]

Wrap an if statement around the getline() call to test whether or not it succeeds.

if( !getline(in, str) )
{
cout<< "error in getline()";
}
else{
cout << str << endl;
}
in.close();

Outputs "error in getline()"

hmm why oh why

[ZuK]

try

ifstream in("test.txt", ios::in);
if ( ! in ) {
    cout << "file 'test.txt' not found." << endl;
}

Kurt

[jacobis]

ifstream in("test.txt", ifstream::in);
if(in.is_open())
{
cout << "iiiiit's open :-D ";
}
else
cout<<"iiiiit's not open";


Output: it's not open.

So the problem is, the file isn't opening.

test.txt is definitely in the directory

I've even tried ifstream in("c:\\temp\\test.txt"); <--- file is in temp also.
and i've tried:

ifstream in;
in.open("c:\\temp\\test.txt");

[jacobis]

Could it be a visual studio problem?

I can't understand why something so easy is giving me so much trouble.

[Lindley]

Show us your local directory structure related to the project.

Also, check to make sure that the project's "Working Directory" field isn't something unexpected.

And try dropping the second parameter of the ifstream constructor. I don't know that's the problem, but the default has always worked for me.

[jacobis]

Show us your local directory structure related to the project.

Not sure about the local directory structure.

Also, check to make sure that the project's "Working Directory" field isn't something unexpected.

Working directory was blank, i changed it to the project folder. didn't help.

And try dropping the second parameter of the ifstream constructor. I don't know that's the problem, but the default has always worked for me.

test.txt still not open.


Thanks for all your input!!