QVector

[A Former User]

And what is in your data file please?

[A Former User]

test.dat contains:

2
100
50
50
2.5
5
60
10
75
45
30
1.6
2
45
25
25
15

So _stages should pick up the 2 at the top of the file. I then have:

@while (!its.atEnd())
{
int i = 0;
while(i < _stages)
{
line = its.readLine();
_wMasses.push_back(line.toDouble());

line = its.readLine();
_fMasses.push_back(line.toDouble());

line = its.readLine();
_dMasses.push_back(line.toDouble());

line = its.readLine();
_flowRates.push_back(line.toDouble());

line = its.readLine();
_burnTimes.push_back(line.toDouble());

line = its.readLine();
_thrusts.push_back(line.toDouble());

line = its.readLine();
_alphas.push_back(line.toDouble());

i++;
}

line = its.readLine();
_Mass = line.toDouble();

line = its.readLine();
_Alpha = line.toDouble();
}@

Which reads the rest of the file.

[A Former User]

Does it work if you change this line:

@
infile.open(QIODevice::ReadOnly);
@

to this:

@
infile.open(QIODevice::ReadOnly | QIODevice::Text);
@

[A Former User]

No, still doesn't work...

[A Former User]

I had:

@if (!(infile.open(QIODevice::ReadOnly)))
{
return 1;
}@

And it goes in and returns 1. Not sure what's going on.

[A Former User]

Does your process have permissions to read the file? Is some other process locking the file? Is the path correct?

[A Former User]

My file was either in the wrong location, or I was trying to run my program from the wrong directory. Thank you so much.

[A Former User]

Meh, we've all been there, done that at some point. :-) Another trick you can use is to use something like this:

@
QFileInfo fi( fileName );
if ( !fi.isReadable() )
do something
@

Glad you got it working in the end.

[A Former User]

Reading input files is always something I struggle with. Now I can get down to the business of writing the code to actually do stuff. Thanks again for everyone's help!

[andre]

You might want to add some error checking in your parsing code... It is not very save to just assume that your reading and converting worked properly, if you have no control over the input file...

[A Former User]

another option would be to check if the file you want to open exists before trying to open it.
Just use something like
@if(QFile::exists(filename))
{
QFile file (filename);
if(file.open(QIODevice::ReadOnly)
{
QByteArray strFileContent = file.readAll();
}
}@

This way its easier to find the error when debugging.

PS: Any possible errors are mine and are not to be used by anyone else.