Subscribe more outputs to QTextStream

Question

I was just following this topic "How to print to console when using Qt" in order to make my application work. I started to wonder- Is it possible to subscribe more outputs to a single QTextStream? For example, lets say when I wrote something to my QTextStream object, I want the string to be printed to stdout and a specified file as well. Would this be possible? I would appreciate all help.

Edit: To be more exact, I am trying to find an optimal way to send a stream either to stdout, file or file + stdout. I dont want to copy data more times that I need to. Sany hints of how to achieve this?

score 1 · Answer 1 · answered Oct 26 '16 at 20:49

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One could, theoratically, write a QIODevice derived class that delegates its writes to multiple other QDIODevice objects and then use an object of that class as the device the QTextStream works on.

However, what you are likely actually looking for is a logging framework.

answered Oct 26 '16 at 20:49

Kevin Krammer

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Yes I am writing a logger singleton class. – Łukasz Przeniosło Oct 26 '16 at 20:51
I added more detaild to my question, maybe you could reffer? – Łukasz Przeniosło Oct 26 '16 at 21:00
@ŁukaszPrzeniosło Your logger doesn't have to be a singleton. It'll probably be more generic and less convoluted if it isn't :) – Kuba hasn't forgotten Monica Oct 26 '16 at 21:02
@KubaOber I know but I am used to the schematic from regular c++. Wanted to try it out with Qt. – Łukasz Przeniosło Oct 26 '16 at 21:03
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This *is* regular C++ :) Qt is just a framework. Singletons are to be avoided, pretty much. You can sure hold an instance in a way that's globally accessible, but that doesn't make it a singleton yet :) – Kuba hasn't forgotten Monica Oct 27 '16 at 01:10

Subscribe more outputs to QTextStream

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