Mac: getline not working as it should (or as it does in Windows)

igorland

I naively thought that converting a project from Windows to Mac would be a very simple task. Not the case. Almost any piece of code that works well in Windows does not in OSX. Another issue:

I have a text file that looks like this:

A|BBBBB|1|2
R|RBBBB
R|RBBBB

A|CCCCC|1|2
R|RCCCC
[/code]

The following code searches for the relevant text in the file based on the key and returns all lines that belong to the key:

[code]
while( std::getline( ifs, line ) && line.find(search_string) != 0 );

if( line.find(search_string) != 0 )
{
    navData = "N/A" ;
}

else{

    navData = line + '\n' ; // result initially contains the first line

    // now keep reading line by line till we get an empty line or eof
    while( std::getline( ifs, line ) && !line.empty() )
    {
        navData += line + '\n';
    }
}

ifs.close();
return navData;

[/code]

A|CCCCC|1|2
R|RCCCC
[/code]

Whyyyyy????? :_((

Cheers, everyone!

SGaist

Hi,

Since you're using the std library rather than QFile, what does it have to do with Qt ?

Note that line endings are not the same on Windows and OS X.

igorland

Greetings, SGaist!
[quote author="SGaist" date="1388521382"]Hi,

Since you're using the std library rather than QFile, what does it have to do with Qt ?

[/quote]

I guess the fact that it is done with QtCreator. Also, I could not find the correct equivalent for line.find() function with QTextStream.

[quote author="SGaist" date="1388521382"]

Note that line endings are not the same on Windows and OS X.[/quote]

Huh? Thanks for that. I will google it.

Best!

igorland

I am reading that '\n' IS the Mac's new line. I do not understand... Sorry...

steno

Well windows uses line endings as '/r/n' and osx uses '/n'

SGaist

Then don't use QTextStream, just QFile to read your file line by line in a QByteArray or QString

igorland

OK. Before I go to celebrate the New Year, my last attempt failed. :-(

[code]
void MainWindow::on_pushButton_clicked()
{
QString navDataPath = "S://Path//File.txt";

QFile navDataFile&#40;navDataPath&#41;;

if (navDataFile.open(QIODevice::ReadOnly | QIODevice::Text))
{
    QTextStream in(&navDataFile);


    while(!navDataFile.atEnd() )
    {

        QString line = in.readLine();

        if(!line.contains("key"))
        {
            qDebug() << "NOT FOUND";
        }

        else
        {

            result = line + '\n';

            while (!navDataFile.atEnd() && !line.isNull())
            {
                result += result + '\n';
            }
        }
    }
}

navDataFile.close();

qDebug() << "LINE: " << result;

}
[/code]

It crashes. I am at a loss.

Happy New Year!

SGaist

You should use in.atEnd()