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Qt Signals & Slots: How they work

The one thing that confuses the most people in the beginning is the Signal & Slot mechanism of Qt. But it’s actually not that difficult to understand. In general Signals & Slots are used to loosely connect classes. Illustrated by the keyword emit, Signals are used to broadcast a message to all connected Slots. If no Slots are connected, the message "is lost in the wild". So a connection between Signals & Slots is like a TCP/IP connection with a few exceptions, but this metaphor will help you to get the principle. A Signal is an outgoing port and a Slot is an input only port and a Signal can be connected to multiple Slots.

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How to start with Qt?

In this series I’ll give you a starting point on working with with Qt. Like I mentioned in Why I love the Qt framework I had a hard time at the beginning. I want to give you an easier start with this awesome peace of technology. This page will serve as an index for the whole series of tutorials and explanations. As more posts follow this page will be updated. I know there are plenty of tutorials on Qt, but maybe I’ll explain some things in a way you understand better. Continue reading

Should I use Qt containers or the std ones?

If you come from plain vanilla C++, you only know the C++ Standard Library with its containers like std::vector. If you know how to use them, you can accomplish your tasks pretty fast. But if you’re coming from an other language, the naming might be a bit odd. The Qt containers offer both, C++ style and Java style naming of methods. So coming from an other language the Qt ones might be easier to use.

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