Old Version of Qt - Should I port?

[MichelCarroll]

For one of my projects, I need to modify an old application that uses Qt. The code is poorly documented, and doesn't include the version of Qt it uses.

The application was developed in 2007-08. From my observations, I believe the version to be Qt 2.0. This is because it includes "#include <qcanvas.h>", which I believe was replaced by q3canvas in Qt 3.0.

Should I port the application to the latest Qt? Or would it be possible to find an older version of Qt for the purpose of modifying this application.

[wysota]

QCanvas is a Qt3 class and was made obsolete in Qt 4 and replaced by QGraphicsView.

[MichelCarroll]

I've only started porting from Qt3 to Qt4, and already I'm losing hope. This is a very heavy application.

Any other alternatives?

[aamer4yu]

You should keep trying.. QGraphicsView is a wonderful replacement and most of the latest animation and performance features are being worked upon in QGraphicsView .
May be porting might take time and mind... but it will be fruitful in the end

[wysota]

I've only started porting from Qt3 to Qt4, and already I'm losing hope. This is a very heavy application.

Any other alternatives?

Did you try the automatic porting tool? It's called qt3to4 as far as I remember and is part of Qt4 distribution. It will give you a kick start. There is also an article in Qt Quarterly about porting QCanvas based code to Graphics View.

[MichelCarroll]

Did you try the automatic porting tool? It's called qt3to4 as far as I remember and is part of Qt4 distribution. It will give you a kick start. There is also an article in Qt Quarterly about porting QCanvas based code to Graphics View.

Thank you for the suggestion. I just tried qt3to4, and it did indeed give me a kick start.

However, I'm still trying to contact the original makers of the software. It's still a very big job, which will probably require their intervention.