[SOLVED] Usage of QRegExp

srivatsa

I am parsing the output of @vol@ command such that I only get the volume serial number i.e like qwer-12w2. But I get nothing, here's my code:

@#include <QtCore/QCoreApplication>
#include <QProcess>
#include <QDebug>

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QProcess process;
process.start("cmd /c vol C:");

process.waitForFinished(-1);
QByteArray out = process.readAllStandardOutput();
qDebug() << out;
QRegExp rx("The Volume Serial Number is (.+)\\.");
if(rx.exactMatch(out)){
    QString id = rx.cap(1);
    qDebug() << id;
}
return a.exec(&#41;;

}@

TheBadger

Hi,

Took me a few seconds to figure it out but here it is:
On my computer the output of your process ("cmd /c vol C:") is (Windows 7):
@
Volume in drive C is SYSTEM
Volume Serial Number is 9C75-16CB
@

If you look at your RexExp pattern you would notice that your patter starts with "The" while the output does not have a "The" in (first problem).

My output does not contain a '.' at the end: Second Problem

My suggestion is to use a patter like:
@
QRegExp rx(".*Volume Serial Number is (.+)$");
@

That should work for what you are trying to do

srivatsa

Got it :) Thank you @Badger.