Printing Qt variables

Question

I'm programming in Qt, but I'm more accustomed to PHP.

So with that in mind, how do I 'echo' or 'print' out the contents of a QStringList or QString to ensure the contents are as expected?

I'm building a GUI application. Is there anyway to print the contents?

Obviously in PHP, you can print_r on an array, is there anything similar for a QStringList? And echo a variable, again, anything similar to QString?

I can provide code if needs be.

Thanks.

László Papp · Accepted Answer · 2014-07-16 16:49:28Z

8

main.cpp

#include <QStringList>
#include <QDebug>

int main()
{
    QStringList myStringList{"Foo", "Bar", "Baz"};
    qDebug() << myStringList;
    QString myString = "Hello World!";
    qDebug() << myString;
    return 0;
}

main.pro

TEMPLATE = app
TARGET = print-qstringlist
QT = core
CONFIG += c++11
SOURCES += main.cpp

Build and Run

qmake && (n)make

Output

("Foo", "Bar", "Baz")
"Hello World!"

If you need to drop the noisy brackets and double quotes generated by qDebug, you are free to either use QTextStream with custom printing or simply fall back to the standard cout with custom printing.

answered Jul 16, 2014 at 16:49

László Papp

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3 Comments

sark9012 Over a year ago

I included the QDebug and used the code you provided in the cpp. Perfect. I didn't need to alter the pro file...what are you adding in there that I need?

sark9012 Over a year ago

It worked without adding the pro file entries, so I was wondering what the TARGET = print-qstringlist is doing? Awesome answer thanks!

László Papp Over a year ago

@Luke: yeah, if you do not specify the TARGET variable, the generated executable will be called based on the parent folder name.

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