Reading .txt file info into variables
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Thank you very much Gerolf. I found this code snippet which supposedly puts my text file into a QStringList
@QStringList stringList;
QFile textFile("test.txt");
QTextStream textStream(&textFile);
while (true)
{
QString line = textStream.readLine();
if (line.isNull())
break;
else
stringList.append(line);
}@If that is done correctly, how do I go about iterating through it?
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I have QStringList of integers that I read in from a file. How do I iterate through this list to: a) save each value b) cast each to an integer.
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I'm not sure what you mean by "save each value" but iterating through a QStringList is fairly simple. There are a number of ways to do so.
@
QStringList list;// iterate through each element of list (which will be accessible via the QString "str")
foreach (QString str, list)
{
...
int value = str.toInt(); // get integer representation of str
...
}
@BTW, This stuff is very well-documented.
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I meant to say store each into a variable, which you answered. However I'm trying to do so in the following code, and when I try to print the value, nothing is displayed. Am I reading my text file into the QStringList incorrectly?
@int main()
{
QStringList stringList;
QFile textFile("test.txt");
QTextStream textStream(&textFile);
while (true)
{
QString line = textStream.readLine();
if (line.isNull())
break;
else
stringList.append(line);
}foreach(QString str, stringList) { int value = str.toInt(); cout << value; } return 0;}
@ -
You need to call "textFile.open()":http://doc.qt.nokia.com/4.7-snapshot/qfile.html#open
Be sure and check its return value. There's an example in the QFile docs.
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A cleaner implementation would probably be:
@
QStringList stringList;
QFile textFile("test.txt");
if (textFile.open(QIODevice::ReadOnly)
{
QTextStream textStream(&textFile);
while (!textStream.atEnd())
{
stringList.append(textStream.readLine());
}
}
@Caveat: Brain to keyboard. Untested code. Not responsible for silly errors. YMMV
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that worked! thank you very much!
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This discussion looks a lot like "this":http://developer.qt.nokia.com/forums/viewthread/10146/ one...
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[quote author="Andre" date="1317189187"]This discussion looks a lot like "this":http://developer.qt.nokia.com/forums/viewthread/10146/ one...[/quote]
I merged both threads.
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I have the code exactly as you all have showed me but there was no output. so i put some print statements inside of the loops to see if the compiler was even entering the loops and it is not. What am I doing wrong?
@int main()
{
QStringList stringList;
QFile textFile("test.txt");
if (textFile.open(QIODevice::ReadOnly))
{
QTextStream textStream(&textFile);
while (!textStream.atEnd())
{
stringList.append(textStream.readLine());
cout << "test1";
}
}
foreach(const QString line, stringList)
{
cout << "test2";
cout << line.toStdString();
}
return 0;
}@