QTextStream crashing program when adding items to combobox

[gabor53]

Hi,
I use QTextStream to populate a combobox:

        QFile inputFile("C:/Programming/Projects/Folkfriends/combo.txt");

        if(inputFile.open (QIODevice::ReadOnly | QIODevice::Text))
        {
            QTextStream in(&inputFile);
            while(!in.atEnd ())
            {
                QString Material = in.readLine ();
                Material_Combo->addItem (Material)	;
            }
        }

Any idea why the while loop crashes the program? (It gives a message like "Stopped working)?

Thank you.

[michelson]

For me it seems valid, but if i were you I would try peeking what exactly in.readLine() is returning every time (mayby the file is corrupted?).

QDebug() << "Read string: " <<  Material;

[SGaist]

Hi,

Maybe a silly question but, did you initialize Material_Combo correctly ?

[gabor53]

Hi,
I initialized like this:

QComboBox *Material_Combo = new QComboBox;

I checked what in.readLine() returns and found this:

Read Matarial string: "Wood"
Read Matarial string: "Metal"
Read Matarial string: ""
Read Matarial string: ""
Read Matarial string: ""
Read Matarial string: ""
Read Matarial string: ""
Read Matarial string: ""
Read Matarial string: ""
Read Matarial string: ""

The empty strings are keep going until I terminate the program. There are 2 lines in the txt file, Wood and Metal. I think it can't find the end of the file maybe, but I don't know why. Thank you for any ideas.

[gabor53]

I think it is the while loop. I added this section to the program line by line and the only time, when the program crashed is when I added the while loop. Still don't know though why it crashes.

[gabor53]

If I take away the ! sign and just use

while(in.atEnd())

the program does not crash though the loop reads nothing. Still don't kn ow why....

[michelson]

Mayby try this one:

QComboBox *Material_Combo = new QComboBox(this);
do
{
    QString line = in.readLine();
    QDebug() << "line: " << line;
    Material_Combo->addItem(line);
} while (!line.isNull());

It is the same but diffrent... Still the same :D I mean i dont know why it crashes when you use atEnd()however it seems that the file is corrupted since the end of file is not detected (file encoding thing possible..?).

[SGaist]

Or, since it's a text file:

QFile inputFile("C:/Programming/Projects/Folkfriends/combo.txt");
if (!inputFile.open(QIODevice::ReadOnly | QIODevice::Text))
     return;

while (!inputFile.atEnd()) {
    QByteArray material = inputFile.readLine();
    Material_Combo->addItem (material)  ;
}

?